Vaisala HUMICAP HMT330 Series User Manual
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Vaisala HUMICAP HMT330 Series User Manual

Vaisala HUMICAP HMT330 Series User Manual

Humidity and temperature
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USER'S GUIDE
®
Vaisala HUMICAP
Humidity and
Temperature Transmitter Series
HMT330
M210566EN-D

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Summary of Contents for Vaisala HUMICAP HMT330 Series

  • Page 1 USER'S GUIDE ® Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT330 M210566EN-D...
  • Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of...

  • Page 3: Table Of Contents

    HMT333 for Ducts and Tight Spaces ........37 HMT334 for High Pressure and Vacuum Applications..37 HMT335 for High Temperatures ......... 40 HMT337 for High Humidity Applications ......40 Temperature Probe (Optional) ..........40 HMT338 for Pressurized Pipelines........41 Tightening the Clasp Nut............. 42 VAISALA _____________________________________________________________________ 1...
  • Page 4 User's Guide _______________________________________________________________________ Optional Modules..............44 Power Supply Module............44 Installation ..............45 Warnings ................46 Galvanic Isolation for Output ..........48 Third Analog Output ............48 Installation and Wiring ............49 Relays..................50 Installation and Wiring ............50 Selecting the Activation State of the Relay ....50 RS-422/485 Interface ............52 Installation and Wiring ............52 8-Pin Connector..............55 CHAPTER 4...
  • Page 5 Measurement-Based Relay Output Modes......97 Relay Setpoints .............. 97 Hysteresis ..............98 Relay Indicating Transmitter Error Status ......98 Enabling/Disabling Relays ..........100 Setting Relay Outputs ............100 RSEL ................101 Testing Operation of Relays..........103 RTEST ................. 103 VAISALA _____________________________________________________________________ 3...
  • Page 6 User's Guide _______________________________________________________________________ Operation of RS-485 Module ..........104 Networking Commands .............104 SERI ................104 ECHO ................105 SMODE ................105 INTV ................106 ADDR ................106 SEND................107 OPEN ................107 CLOSE .................107 Sensor Functions ..............108 Chemical Purge (Optional) ..........108 Automatic Chemical Purge (Interval Purge)....109 Manual Chemical Purge ..........109 Chemical Purge in Power Up ........109 Starting and Configuring Chemical Purge ......110 Using Buttons on Motherboard........110...
  • Page 7 Options and Accessories ..........136 Dimensions (in mm) ............. 139 HMT331................140 HMT333................140 HMT334................141 HMT335................141 HMT337................142 HMT338................142 Temperature Probe ............142 Technical Support ..............143 Return Instructions .............. 143 Vaisala Service Centers............144 VAISALA _____________________________________________________________________ 5...
  • Page 8 User's Guide _______________________________________________________________________ APPENDIX A PROBE INSTALLATION KITS AND INSTALLATION EXAMPLES ..145 Duct Installation Kits (for HMT333/337/335).......145 Duct Installation Kit for Temperature Probe (for HMT337)146 Pressure Tight Swagelok Installation Kits (for HMT337)..147 RH Probe Installation............147 Temperature Probe Installation .........147 Examples of Vapor Tight Installations with Cable Gland .148 RH-Probe Installations (for HMT333/337) ......148 T- Probe Installations (HMT337) ........149 Example of Climate Chamber Installation ......150...
  • Page 9 Vapor Tight Installation............149 Figure 74 Wall Mounting Installation ............149 Figure 75 Climate Chamber Installation (not Available from Vaisala)..150 Figure 76 Example of Installation through Roof ........151 Figure 77 Installing Sensor Head through Ball Valve Assembly .... 152 Figure 78 Meteorological Installation Kit for Outdoor Installation...
  • Page 10 User's Guide _______________________________________________________________________ List of Tables Table 1 Quantities Measured by HMT330..........15 Table 2 Optional Quantities Measured by HMT330 ......16 Table 3 HMT338 Probe Dimensions .............41 Table 4 Connecting the Twisted Pair Wires to the Screw Terminals ..52 Table 5 4-Wire (Switch 3: On) ...............53 Table 6 2-Wire (Switch 3: Off) ...............54...

  • Page 11: Chapter 1 General Information

    This chapter provides general notes for the manual and the product. About This Manual This manual provides information for installing, operating, and ® maintaining Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT330. Contents of This Manual This manual consists of the following chapters: - Chapter 1, General Information, provides general notes for the manual and the product.

  • Page 12: General Safety Considerations

    NOTE Note highlights important information on using the product. Feedback Vaisala Customer Documentation Team welcomes your comments and suggestions on the quality and usefulness of this publication. If you find errors or have other suggestions for improvement, please indicate the chapter, section, and page number. You can send comments to us by e-mail: manuals@vaisala.com...

  • Page 13: Product Related Safety Precautions

    ESD Protection Electrostatic Discharge (ESD) can cause immediate or latent damage to electronic circuits. Vaisala products are adequately protected against ESD for their intended use. However, it is possible to damage the product by delivering electrostatic discharges when touching, removing, or inserting any objects inside the equipment housing.

  • Page 14: Recycling

    License Agreement All rights to any software are held by Vaisala or third parties. The customer is allowed to use the software only to the extent that is provided by the applicable supply contract or Software License Agreement.

  • Page 15: Warranty

    Products should Vaisala so require, be sent to the works supplied hereunder, which obligations of Vaisala or to such other place as Vaisala may liabilities are hereby expressly cancelled and indicate in writing, freight and insurance waived. Vaisala's liability...
  • Page 16 User's Guide _______________________________________________________________________ This page intentionally left blank. 14 ___________________________________________________________________ M210566EN-D...

  • Page 17: Chapter 2 Product Overview

    This chapter introduces the features, advantages, and the product nomenclature of HMT330. Introduction to HMT330 ® Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT330 provides reliable humidity measurement in wide range of applications. Analog outputs can be chosen between current and voltage signals.

  • Page 18: Basic Features And Options

    User's Guide _______________________________________________________________________ Table 2 Optional Quantities Measured by HMT330 Quantity Abbreviati Metric Unit Non Metric Unit Dewpoint / Frostpoint ºC ºF Temperature (T Dewpoint Temperature (T ºC ºF Absolute humidity (a) gr/ft Mixing ratio (x) g/kg gr/lb Wetbulb temperature (T ºC ºF Humid air volume/ dry air...

  • Page 19: Figure 1 Transmitter Body

    Chapter 2 ___________________________________________________________ Product Overview 0503-001 Figure 1 Transmitter Body The following The following numbers refer to Figure 1 above: Signal + powering cable gland Cable gland for optional module Cable gland for optional module Cover screw (4 pcs) Display with keypad (optional) Cover LED VAISALA________________________________________________________________________ 17...

  • Page 20: Figure 2 Inside Of Open Transmitter

    User's Guide _______________________________________________________________________ 0508-010 Figure 2 Inside of Open Transmitter The following numbers refer to Figure 2 above: Service port (RS-232) DIP switches for analog output settings Power supply and signal wiring screw terminals Relay/RS-422/485 module (optional) Grounding connector Power supply module (optional) Analog output relay module (optional) Humidity probe cable Temperature probe cable (optional)

  • Page 21: Probe Options

    Chapter 2 ___________________________________________________________ Product Overview Probe Options 0507-033 Figure 3 Probe Options The following numbers refer to Figure 3 above: HMT331 for demanding wall-mounted applications HMT333 for ducts and tight spaces HMT334 for high pressure and vacuum applications (up to 100 bars) HMT335 for high temperatures (up to 180 ºC, vapor tight) *) Flange available as an option HMT337 for high humidity applications (optional warmed...

  • Page 22: Warmed Probe Hmt337

    User's Guide _______________________________________________________________________ Warmed Probe HMT337 Temperature difference between the probe head and external environment can cause a risk of condensation on the sensor. A wet probe cannot observe the actual humidity in the ambient air. If the condensed water is contaminated, the life span of the probe may shorten and calibration may change.

  • Page 23: Chapter 3 Installation

    Chapter 3 ________________________________________________________________ Installation CHAPTER 3 INSTALLATION This chapter provides you with information that is intended to help you install the product. Mounting the Housing The housing can be mounted either without the mounting plate or with optional mounting plates. Standard Mounting without Mounting Plate Mount the housing by fastening the transmitter to the wall with 4...

  • Page 24: Wall Mounting With Wall Mounting Kit

    User's Guide _______________________________________________________________________ Wall Mounting with Wall Mounting When mounting with wall mounting kit the mounting plate (Vaisala order code 214829) can be installed directly on wall or onto a standard wall box (also US junction box). When wiring through back wall, remove the plastic plug from the wiring hole in the transmitter before mounting.

  • Page 25: Mounting With Din Rail Installation Kit

    Mounting with DIN Rail Installation DIN rail installation kit includes a wall mounting kit, 2 clip-fasteners and 2 screws M4 × 10 DIN 7985 (Vaisala order code 215094). Attach two spring holders to the plastic mounting plate by using the screws provided in the installation kit.

  • Page 26: Pole Installation With Installation Kit For Pole Or Pipeline

    Pole Installation with Installation Kit for Pole or Pipeline Installation kit for pole or pipeline (Vaisala order code: 215108) includes the metal mounting plate and 4 mounting nuts for pole mounting. When mounting, the arrow in the metal mounting plate must point upwards;...

  • Page 27: Figure 10 Mounting With Metal Wall Mounting Plate

    Chapter 3 ________________________________________________________________ Installation Metal mounting plate is included in rain shield with installation kit and installation kit for pole or pipeline. 0503-041 Figure 10 Mounting with Metal Wall Mounting Plate The following numbers refer to Figure 10 above: Mount the plate to wall with 4 screws M8 (not provided) Fasten HMT330 to the mounting plate with 4 fixing screws M6 (provided) Note the position of the arrow when mounting.

  • Page 28: Mounting Rain Shield With Installation Kit

    Figure 12 Mounting Rain Shield with Installation Kit The following numbers refer to Figure 12 above: = Fasten the rain shield with installation kit (Vaisala order code: 215109) to the metal mounting plate with 2 (M6) mounting screws (provided). = Fasten the mounting plate with rain shield with installation kit to the wall or to the pole (see pole installation).

  • Page 29: Panel Mounting Frame

    Panel Mounting Frame A panel mounting frame with adhesive tape is available as an option (Vaisala order code: 216038). After the HMT330 has been installed through the panel, a frame can be used to finish off the sawed surface of the panel.

  • Page 30: Wiring

    User's Guide _______________________________________________________________________ Wiring Cable Bushings A single electrical cable with screen and three to ten wires is recommended for power and analog/serial connections. The cable diameter should be 8 ... 11 mm. The number of cable bushings depends on the transmitter options. See the following recommendations for the cable bushings: 0503-010 Figure 15...

  • Page 31: Grounding The Cables

    Chapter 3 ________________________________________________________________ Installation Grounding the Cables Ground the screen of the electrical cable properly to achieve the best possible EMC performance. 0504-049 Figure 16 Grounding the Screen of Electrical Cable VAISALA________________________________________________________________________ 29...

  • Page 32: Grounding The Transmitter Housing

    User's Guide _______________________________________________________________________ Cut back outer sheath to desired length. Cut back screen braiding or screen foil to dimension X (see figure 3). Push the domed cap nut (item 1) and the seal insert with contact socket of the gland (item 2+3) onto the cable as shown in the diagram.

  • Page 33: Signal And Power Supply Wiring

    Chapter 3 ________________________________________________________________ Installation Signal and Power Supply Wiring When connecting transmitter with 8-pin connector, see section 8-Pin Connector on page 55. When wiring the power supply module, see section Power Supply Module on page 44. 0506-028 Figure 17 Screw Terminal Block on Motherboard The following numbers refer to Figure 17 above: Power supply terminals 10 ...

  • Page 34: Connections To 24 Vac Power Supply

    User's Guide _______________________________________________________________________ When wiring RS-485 module, relay module or additional analog output module, see section RS-422/485 Interface on page 52, section Relays on page 50, and section Third Analog Output on page 48. Connect the power supply wires to the connectors: POWER 10 ...

  • Page 35: Figure 18 Connections To 24 Vac Power Supply

    Chapter 3 ________________________________________________________________ Installation 0507-020 Figure 18 Connections to 24 VAC Power Supply VAISALA________________________________________________________________________ 33...

  • Page 36: Probe Mounting

    User's Guide _______________________________________________________________________ Probe Mounting In humidity measurement and especially in calibration it is essential that temperature of the probe and measuring environment is the same. Even a small difference in temperature between the environment and the probe causes an error. As the curve below shows, if the temperature is +20 °C and the relative humidity 100 %RH, a difference of ±1 °C between the environment and the probe causes an error of ±6 %RH.

  • Page 37: General Instructions For Probes With Cable

    Chapter 3 ________________________________________________________________ Installation General Instructions for Probes with Cable Mount the probes with a cable with the sensor head horizontally; this way, any water condensing on the tube cannot flow onto the sensor. 0507-024 Figure 20 Horizontal Mounting of Sensor Head The following numbers refer to Figure 20 above: 1 = To be sealed.

  • Page 38: Figure 21 Vertical Mounting Of Sensor Head

    If this is not possible and the sensor head must be inserted from the top, the point of entry must be carefully insulated. For Vaisala probe installation kits and some installation examples see Appendix A on page 145. 36 ___________________________________________________________________ M210566EN-D...

  • Page 39: Hmt333 For Ducts And Tight Spaces

    The HMT333 is a small size (ø = 12mm) general-purpose probe suitable for ducts and channels with the installation kit available from Vaisala. The HMT333 provides for two measuring range options. The first probe version is equipped with a flexible cable and can be used when measuring in environments up to 80 ºC.

  • Page 40: Figure 22 Hmt344 Probe

    User's Guide _______________________________________________________________________ 0506-029 Figure 22 HMT344 Probe The following numbers refer to Figure 22 above: Tightening cone Fitting screw, M22x1.5 or NPT 1/2" Sealing washer Sensor head; Ø12 mm. Tighten the nut a further 30º (1/12) turn or if you have a torque spanner tighten it with a torque of 80 ±...

  • Page 41: Figure 24 Cleaning Of Tightening Cone

    Chapter 3 ________________________________________________________________ Installation 0503-033 Figure 24 Cleaning of Tightening Cone The following numbers refer to Figure 24 above: Fitting screw Sealing washer Tightening cone Clean cotton stick In pressurized processes it is essential to tighten the supporting nuts CAUTION and screws very carefully to prevent loosening of the probe by the action of pressure.

  • Page 42: Hmt335 For High Temperatures

    HMT337 with installation examples: - Duct mounting kit - Cable gland - Pressure tight Swagelok connector - Vaisala's Meteorological Installation kit The installation kits are available for both humidity and temperature probe. Temperature Probe (Optional) An external temperature probe for HMT337 is needed for the measurement of the ambient temperature in case you have a transmitter with a warmed probe.

  • Page 43: Hmt338 For Pressurized Pipelines

    Chapter 3 ________________________________________________________________ Installation HMT338 for Pressurized Pipelines Due to the sliding fit the HMT338 is easy to install into and remove from the pressurized process. The probe is especially suitable for the measurements in pipelines. See section Ball Valve Installation Kit for HMT338 on page 152.

  • Page 44: Tightening The Clasp Nut

    User's Guide _______________________________________________________________________ 0507-025 Figure 26 Sealing of Fitting Body into Process Tightening the Clasp Nut Adjust the probe to a suitable depth according to the type of installation. Tighten the clasp nut first manually. Mark the fitting screw and the clasp nut. Tighten the nut a further 50 -60º...
  • Page 45 Chapter 3 ________________________________________________________________ Installation NOTE Take care not to over tighten the clasp nut to avoid difficulties when opening it. CAUTION Take care not to damage the probe body. A damaged body makes the probe head less tight and may prevent it from going through the clasp nut.

  • Page 46: Optional Modules

    User's Guide _______________________________________________________________________ Optional Modules Power Supply Module The AC (mains) power connection may be connected to the power supply module only by an authorized electrician. A readily accessible disconnect device shall be incorporated in the fixed wiring. 0506-027 Figure 28 Power Supply Module The following numbers refer to Figure 28 above: Connect AC (mains) voltage wires to these terminals...

  • Page 47: Installation

    Chapter 3 ________________________________________________________________ Installation Installation Disconnect the power and open the transmitter cover. Remove the protective plug from the cable gland and thread the wires. In case the power supply module is installed in the factory, continue with the step 5. To attach the module fasten the power module to the bottom of the housing with four screws.

  • Page 48: Warnings

    User's Guide _______________________________________________________________________ Warnings Questo prodotto é conforme alla Direttiva sul basso voltaggio (73/23 CEE). La conduttura elettrica puó essere collegata al modulo di alimentazione elettrica soltanto da un elettricista autorizzato. Non staccare l´alimentazione elettrica dal trasmettitore quando é acceso. Non collegare la corrente elettrica al modulo di alimentazione elettrica se non é...
  • Page 49 Chapter 3 ________________________________________________________________ Installation Ez a termék megfelel a Kisfeszültségű villamos termékek irányelvnek (73/23/EGK). A hálózati feszültséget csak feljogosított elektrotechnikus csatlakoztathatja a tápegységmodulra. A bekapcsolt távadóról ne csatolja le a tápegységmodult. Ne csatlakoztassa a hálózati feszültséget a tápegységmodulhoz, ha az nincs beépítve a HMT330 távadóba.

  • Page 50: Galvanic Isolation For Output

    User's Guide _______________________________________________________________________ Galvanic Isolation for Output If galvanic isolation of the power supply line from the output signals is needed, HMT330 can be ordered with optional output isolation module. This module prevents harmful grounding loops. NOTE Output isolation module is not needed when using the power supply module.

  • Page 51: Installation And Wiring

    Chapter 3 ________________________________________________________________ Installation Installation and Wiring Disconnect the power. In case the analog output module is installed in the factory, continue with the step 4. To attach the module, open the transmitter cover and fasten the analog output module to the bottom of the housing with four screws.

  • Page 52: Relays

    User's Guide _______________________________________________________________________ Relays HMT330 can be equipped with one or two configurable relay modules. Each module contains two configurable relays. See the contact ratings in section Technical Specifications of Optional Modules on page 135. Installation and Wiring Disconnect the power and open the transmitter cover. In case the relay-module is installed in the factory, continue with step 5.

  • Page 53: Figure 31 Relay Module

    Chapter 3 ________________________________________________________________ Installation 0503-037 Figure 31 Relay Module The following numbers refer to Figure 31 above: Indication led for the relay 1 or 3 Relay test buttons Flat cable pins Indication led for relay 2 or 4 WARNING The relay module may contain dangerous voltages even if the transmitter power has been disconnected.

  • Page 54: Rs-422/485 Interface

    User's Guide _______________________________________________________________________ RS-422/485 Interface 0503-029 Figure 32 RS-485 Module The following numbers refer to Figure 32 above: Flat cable pins Selection switches Screw terminals for wiring Installation and Wiring Disconnect the power. In case the RS-485-module is installed in the factory, continue with the item 4.

  • Page 55: Figure 33 4-Wire Rs-485 Bus

    Chapter 3 ________________________________________________________________ Installation If you use RS-485 (or RS-422) to connect just one HMT330 to a master computer, enable the internal termination of HMT330 by switching switches 1 and 2 ON. Make sure that the master's end of the line is also terminated (by using master's internal termination or with a separate terminator).

  • Page 56: Table 6 2-Wire (Switch 3: Off)

    User's Guide _______________________________________________________________________ Table 6 2-Wire (Switch 3: Off) RS-485 master Data HMT330 ↔ ↔ When operating in communication mode RS-422, set both switches 3 and 4 to ON position (4-wire wiring is required for RS-422 mode). Connect the power and close the cover. 54 ___________________________________________________________________ M210566EN-D...

  • Page 57: 8-Pin Connector

    Chapter 3 ________________________________________________________________ Installation 8-Pin Connector 0503-026 Figure 34 Wiring of Optional 8-Pin Connector Table 7 Wiring of 8-Pin Connector PIN/Terminal Wire Serial Signal Analog Signal RS-232 (EIA-232) RS-485 (EIA-485) White Data out TX Brown (serial GND) (serial GND) Signal GND (for both channels) Green Ch 2+...
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  • Page 59: Chapter 4 Operation

    Chapter 4 _________________________________________________________________ Operation CHAPTER 4 OPERATION This chapter contains information that is needed to operate this product. Getting Started Within a few seconds after power-up the led on the cover of the transmitter is lit continuously indicating normal operation. When using the optional display and turning the transmitter on the first time, the language selection menu window opens.

  • Page 60: Graphic History

    User's Guide _______________________________________________________________________ 0507-002 Figure 35 Basic Display The following numbers refer to Figure 35 above: The Info shortcut button, see section Device Information on page 82 below The Graph shortcut button, see section Graphic History on page 58 below Quantities selected for display NOTE From any view, a four-second press on the right-hand function button...

  • Page 61: Menus And Navigation

    Chapter 4 _________________________________________________________________ Operation Max/min graph: Shows you the minimum and maximum values in a form of curve. Each value is max/min over a time period. See Table 8 below. Table 8 Periods for Trend and Max/Min Calculations Observation Period Period for Trend/Max/Min Calculations (Resolution) 20 minutes...

  • Page 62: Language Setting

    User's Guide _______________________________________________________________________ Open a submenu with button. Press to return to the previous level. Function button EXIT returns you back to the basic display. 0507-003 Figure 37 Main Menus Language Setting Go back to the basic display by keeping the right-hand button pressed for four seconds.

  • Page 63: Rounding Setting

    Chapter 4 _________________________________________________________________ Operation Rounding Setting Round off one decimal by using the Rounding function. The default setting is rounding on. Rounding has no effect on quantities without decimals. Open the MAIN MENU by pressing any of the arrow buttons. Select Display and confirm by pressing the arrow button.

  • Page 64: Keypad Lock (Key Guard)

    User's Guide _______________________________________________________________________ Keypad Lock (Key guard) This function locks the keypad and prevents unintentional key presses. Keep pressing the left-hand function button for 4 seconds to lock the keypad (at any display). To unlock the keypad, press the OPEN button for 4 seconds. Menu PIN Lock You can prevent unauthorized changes of the device settings by activating the menu PIN lock.

  • Page 65: Factory Settings

    MI70 Link program allows you also to monitor transmitter readings directly with a PC (real-time window function). MI70 Link program is available from Vaisala, see list of accessories in section Options and Accessories on page 136. Connect the connection cable between the serial port of your PC and the Service Port of HMT330;...

  • Page 66: User Port Connection

    User's Guide _______________________________________________________________________ For temporary RS-232 connections use the service port. Service port is always available with fixed serial settings. 0507-026 Figure 38 Service Port Connector and User Port Terminal on Mother Board The following numbers refer to Figure 38 above: Service port connector User port terminals User Port Connection...

  • Page 67: Service Port Connection

    Chapter 4 _________________________________________________________________ Operation Connections to pins 4, 6, 7 and 8 on PC serial port are required only if you are using software requiring hardware handshaking. After power-up the transmitter (in STOP-mode) outputs the software version and the command prompt. HMT330/2.02 >...

  • Page 68: Terminal Program Settings

    User's Guide _______________________________________________________________________ Terminal Program Settings The following instructions show a connection example with HyperTerminal program (included in the Microsoft Windows). Follow the instructions below to open a HyperTerminal program: Start HyperTerminal. To get help for starting HyperTerminal, click "Start", select "Help" to open Windows help, and search for "HyperTerminal".

  • Page 69: Figure 41 Connecting To Hyper Terminal

    Chapter 4 _________________________________________________________________ Operation 0507-028 Figure 41 Connecting to Hyper Terminal Set the port settings in the "Properties" window to match the settings of your HMT330 user port/service port. For HMT330, "Flow control" must always be set to "None". Finally click OK to start using the serial connection.

  • Page 70: List Of Serial Commands

    User's Guide _______________________________________________________________________ List of Serial Commands The bold text in the brackets is the default setting. Commands are entered by typing them on your computer and pressing the Enter key. Measurement commands Start the continuous outputting Stop the continuous outputting INTV [0…255 S/MIN/H] Set the continuous output interval (for RUN mode)
  • Page 71 Chapter 4 _________________________________________________________________ Operation Calibration and adjustment commands Relative humidity calibration Temperature calibration Additional temperature probe calibration FCRH Relative humidity calibration after sensor change CTEXT Give the text to calibration information field CDATE Set the calibration date ACAL Analog output calibration Setting and testing the analog outputs AMODE View the analog output modes...

  • Page 72: Getting Measurement Message From Serial Line

    User's Guide _______________________________________________________________________ Getting Measurement Message from Serial Line Enter the R command to start output of measurements. Enter the S command, press the Esc button or reset the transmitter to stop outputting. See command SMODE to change the default (power-up) operation mode.

  • Page 73: Send D

    Chapter 4 _________________________________________________________________ Operation Examples: RH= 98.4 %RH T= 31.1 'C RH= 98.4 %RH T= 31.1 'C Td= 36.0 'C Tdf= 36.0 'C a= 42.4 g/m3 38.8 g/kg Tw= 30.8 'C ppm= 62414 pw= 59.53 hPa pws= 60.52 hPa h= 130.7 kJ/kg If a value is too long to fit to the allocated space in the output, or if there is an error in outputting the quantity, the value is displayed with stars ‘*’.

  • Page 74: Formatting Serial Line Message

    User's Guide _______________________________________________________________________ Formatting Serial Line Message TIME and DATE To set time enter the TIME command. To set date enter the DATE command. TIME DATE These time and date settings are shown on the timestamps of PLAY command. When you want to include time and date in the R and SEND commands, use the FTIME and FDATE commands.

  • Page 75: Fst

    Chapter 4 _________________________________________________________________ Operation Example: >send RH= 98.4 %RH T= 31.0 'C >ftime on Form. time : ON >send 03:47:59 RH= 98.4 %RH T= 31.0 'C >fdate on Form. date : ON >send 2004-07-05 03:48:03 RH= 98.4 %RH T= 31.0 'C >...

  • Page 76: General Settings

    User's Guide _______________________________________________________________________ General Settings Changing Quantities and Units To change quantities and units use serial commands or the optional display/keypad. See Table 1 on page 15 for available quantities and Table 2 on page 16 for optional quantities. NOTE Only the quantities selected when ordering the device can be selected as a display output quantity.

  • Page 77: Using Serial Line

    Chapter 4 _________________________________________________________________ Operation Using Serial Line Use the serial line command FORM to change the format or select a certain quantities for the output commands SEND and R. Use the serial line command UNIT to select metric or non-metric output units. FORM Use the serial line command FORM to change the format or select a certain quantities for the output commands SEND and R.

  • Page 78: Unit

    User's Guide _______________________________________________________________________ Modifier Description Modulus-65536 checksum of message sent so far, ascii encoded hexadecimal notation NMEA xor-checksum of message sent so far, ascii encoded hexadecimal notation Pressure tendency [* or 0...8] Example: >form "RH=" 4.2 rh U5 #t "T=" t U3 #r #n 14.98%RH 74.68'F >send...

  • Page 79: Pressure Compensation Setting

    O and inH O at 4°C. NOTE Pressure compensation is intended to be used in normal air only. When measuring in other gases, please contact Vaisala for further information. Using Display/Keypad Use display/keypad to set the pressure compensation. To select the pressure unit using display/keypad, see section Changing Quantities and Units on page 74.

  • Page 80: Table 13 Multiplication Factors

    User's Guide _______________________________________________________________________ Example: >pres Pressure : 1013.00 hPa ? >pres 2000 Pressure : 2000.00 hPa > Table 13 Multiplication Factors From To: hPa mbar Pa N/m2 0.01 mmHg torr 1.333224 inHg 33.86388 0.09806650 2.490889 1013.25 980.665 1000 psia 68.94757 1) psia = psi absolute.

  • Page 81: Using Serial Line

    Chapter 4 _________________________________________________________________ Operation Use the arrow buttons to set the measuring interval and the unit. Press OK to confirm your settings. If you selected POLL communication mode, select POLL address and press SET to confirm your selection. Use the arrow buttons to set the transmitter address. Press OK to confirm the setting.

  • Page 82: Table 14 Selection Of Output Modes

    User's Guide _______________________________________________________________________ SMODE Use the command SMODE to set the user port start-up operating mode. SMODE [xxxx] where xxx = STOP, RUN or POLL Table 14 Selection of Output Modes Mode Output Available Commands Only with the SEND command STOP All (default mode) Automatic output...

  • Page 83: Table 15 Filtering Levels

    Chapter 4 _________________________________________________________________ Operation ECHO Use the command ECHO to set the user port echo. The command either enables or disables echo of characters received. ECHO [x] where ON (default) or You can use the SERI, SMODE, INTV and ECHO commands to NOTE change/view the user port settings even if you are currently connected to the service port.

  • Page 84: Figure 43 Device Information On Display

    User's Guide _______________________________________________________________________ FILT Use the serial line command FILT [xxx] to set the filtering level. FILT [xxx] where xxx = OFF, ON or EXT (default = ON) Device Information Use the display/keypad or the serial line to display the device information.

  • Page 85: Help

    >? HMT330 / 2.02 Serial number : Z4140007 Batch number : Z4020017 Adjust. date : 2005-06-20 Adjust. info : VAISALA/HEL Date : 2000-02-12 Time : 22:58:25 Serial mode : STOP Baud P D S : 4800 E 7 1 Output interval: 0 s...

  • Page 86: Errs

    User's Guide _______________________________________________________________________ ERRS Use the command ERRS to display transmitter error messages, see Table 16 on page 118. Example: >ERRS NO ERRORS > Example: >ERRS FAIL Error: Temperature measurement malfunction Error: Humidity sensor open circuit > VERS Use the command VERS to display software version information. Example: >vers HMT330 / 2.02...

  • Page 87: Resetting Transmitter By Using Serial Line

    Chapter 4 _________________________________________________________________ Operation Resetting Transmitter by Using Serial Line RESET This command resets the device. The user port switches to start-up output mode selected with command SMODE. Locking Menu/Keypad by Using Serial Line LOCK Use the LOCK command to turn on the menu lock with 4-digit PIN code, for example 4444.
  • Page 88 User's Guide _______________________________________________________________________ Use the LOCK command to turn on the menu lock without PIN code access possibility. LOCK [x] where 1 (Menu locked) Example: >lock 1 Keyboard lock > Use the LOCK command to disable the keypad completely. LOCK [x] where 2 (Keypad disabled) Example:...

  • Page 89: Data Recording

    Chapter 4 _________________________________________________________________ Operation Data Recording Data recording function is always on and collects data automatically into the memory of the device. Recorded data do not disappear from the memory when the power is switched off. Collected data can be observed in a form of a graph in the graphical view of the display or it can be listed out by using the serial line or MI70 Link program.

  • Page 90: View Recorded Data

    User's Guide _______________________________________________________________________ View Recorded Data If the device is provided with the optional display, the graphical display shows the data of the selected quantities, one at a time. See section Graphic History on page 58 for details about graphical display. You may also dump the logged data to the serial line in numeric form with the following commands.

  • Page 91: Play

    Chapter 4 _________________________________________________________________ Operation PLAY Use the PLAY command to output the selected file to the serial line. Data in the output is <TAB> limited. This is compatible with most spreadsheet programs. Before giving the command, set the correct date and time with TIME and DATE commands, if needed. PLAY [x] where 0 ...

  • Page 92: Deleting The Recorded Files

    User's Guide _______________________________________________________________________ Deleting the Recorded Files Use the keypad/display to delete the recorded files. Note that the transmitter automatically overwrites the old data when the memory gets full, so manual deletion of the recorded files is not necessary. Press any of the arrow buttons to open the MAIN MENU. Select System by pressing the ►...

  • Page 93: Figure 44 Current/Voltage Switches Of Output Modules

    Chapter 4 _________________________________________________________________ Operation Analog Output Settings The analog outputs are set in the factory according to the order form. In case you want to change the settings, follow these instructions. See section Third Analog Output on page 48. Changing Output Mode and Range Both output channels have their own DIP switch module with 8 switches;...
  • Page 94 User's Guide _______________________________________________________________________ NOTE Only one of the switches 1 or 2 must be ON at a time. Only one of the switches 3 to 7 must be ON at a time. Example: 0 ... 5 V voltage output selected for channel 1 and 4 ... 20 mA selected for channel 2.

  • Page 95: Analog Output Quantities

    Chapter 4 _________________________________________________________________ Operation Analog Output Quantities Use the display/keypad to change and scale the analog output quantities. Press any of the arrow buttons to open the MAIN MENU. Select Interfaces by pressing the ► arrow button. Select Analog outputs by pressing the ► arrow button. Select Output 1/2/3 by pressing the ►...
  • Page 96 User's Guide _______________________________________________________________________ ASEL [xxx yyy zzz] where xxx = Quantity of channel 1 yyy = Quantity of channel 2 zzz = Quantity of the optional analog output channel 3 Enter always all the quantities for all outputs. For quantities and their abbreviations see Table 1 on page 15 and Table 2 on page 16.

  • Page 97: Analog Output Tests

    Chapter 4 _________________________________________________________________ Operation Analog Output Tests Use the display/keypad for testing to test the operation of the analog by forcing the outputs to known values. Measure then the outputs with a current/voltage meter. Press any of the arrow buttons to open the MAIN MENU. Select System by pressing the ►...

  • Page 98: Analog Output Fault Indication Setting

    User's Guide _______________________________________________________________________ Analog Output Fault Indication Setting Factory default state for analog outputs during error condition is 0 V/ 0 mA. Please be careful when selecting the new error value. The error state of the transmitter should not cause unexpected problems in process monitoring.

  • Page 99: Figure 45 Measurement-Based Relay Output Modes

    Chapter 4 _________________________________________________________________ Operation Operation of Relays Quantity for Relay Output A relay monitors the quantity chosen for the relay output. Any of the quantities available can be chosen. Measurement-Based Relay Output Modes Relay Setpoints When the measured value is in between the "above" and "below" values, the relay is passive.

  • Page 100: Hysteresis

    User's Guide _______________________________________________________________________ Mode 4 is usually used if an alarm needs to be triggered when the measured value exceeds a safe range. The relay is active when measurement is in range, and is released if the value goes out of range or the measurement fails.

  • Page 101: Figure 46 Fault/Online Status Relay Output Modes

    Chapter 4 _________________________________________________________________ Operation ONLINE STATUS Live measurement (data available): relay active (C and NO outputs are closed) No live data (for example: error state, chemical purge or adjustment mode): relay released (C and NC outputs are closed) See Figure 46 below for illustrative examples of the FAULT/ONLINE STATUSrelay output modes.

  • Page 102: Figure 47 Relay Indicators On Display

    User's Guide _______________________________________________________________________ Enabling/Disabling Relays You can deactivate the relay outputs for example for service purposes of your system. Setting Relay Outputs NOTE When having only one relay module installed, its relays are called 'relay 1' and 'relay 2'. When having two relay modules, the relays of the module connected to slot MODULE 1 are called 'relay 1' and relay 2' and relays connected to slot MODULE 2 are called 'relay 3' and 'relay 4' 0508-034...

  • Page 103: Rsel

    Chapter 4 _________________________________________________________________ Operation Select Hysteresis by using the arrow buttons. Press SET to set the hysteresis. Press OK. Select Relay enable by using the arrow buttons, press ON/OFF to enable/disable the relay. RSEL Use the serial line to select the quantity, setpoints and hysteresis or enable/disable the relay outputs.
  • Page 104 User's Guide _______________________________________________________________________ Example of window limit switch: Selecting relay 1 to follow dewpoint/frost point temperature measurement and relay 2 to follow temperature measurement. Two relay setpoints are set for both relays. >rsel rh t Rel1 RH above: 0.00 %RH ? 30 Rel1 RH below: 0.00 %RH ? 40 Rel1 RH...

  • Page 105: Testing Operation Of Relays

    Chapter 4 _________________________________________________________________ Operation Testing Operation of Relays Testing activates relays even if they are disabled. Use the module push buttons to activate the relays. Press the REL 1 or REL 2 button to activate the corresponding relay. Relay is activated: led is lit Relay is not activated: led is not lit...

  • Page 106: Operation Of Rs-485 Module

    User's Guide _______________________________________________________________________ Operation of RS-485 Module RS-485 interface enables communication between RS-485 network and HMT330 transmitter. The RS-485 interface is isolated and offers a maximum communications rate of 115 200 bits/s. (For maximum bus length of 1 km, use bit rate 19200 b/s or less.) When selecting an RS-232-RS-485 converter for the network, avoid self powered converters as they don't necessarily support the needed power consumption.

  • Page 107: Echo

    Chapter 4 _________________________________________________________________ Operation ECHO Use the ECHO command to enable/disable echo of characters received over the serial line. ECHO [x] where ON/OFF (default = OFF) When using 2-wire connection, echo must be always disabled. SMODE Use the SMODE command to set the default serial interface mode. SMODE [xxxx] where xxxx...

  • Page 108: Intv

    User's Guide _______________________________________________________________________ INTV Use the INTV command to set the RUN mode output interval. INTV [n xxx] where 1 - 255 xxx = S, MIN or H This command sets the RUN mode output interval. The time interval is used only when the RUN mode is active. For example, the output interval is set to 10 minutes.

  • Page 109: Send

    Chapter 4 _________________________________________________________________ Operation SEND Use the SEND command to output the reading once in POLL mode: SEND [aa] where aa = address of the transmitter OPEN When all transmitters on the RS-485 bus are in POLL mode the OPEN command sets one transmitter temporarily to STOP mode so that other commands can be entered.

  • Page 110: Figure 48 Decrease Of Sensor Gain

    User's Guide _______________________________________________________________________ Sensor Functions Chemical Purge (Optional) In some specific applications the sensor gain may decrease gradually due to an interference caused by a particular chemical present in the measured gas, for example. The decrease of sensor gain due to an interfering chemical and the effect of the chemical purge process are illustrated below, see Figure 48 below.

  • Page 111: Automatic Chemical Purge (Interval Purge)

    Chapter 4 _________________________________________________________________ Operation Before starting the chemical purge note the following: - The sensor is protected with a PPS grid with stainless steel netting, a stainless steel sintered filter or with membrane SST filter. - The sensor temperature must be below 100 °C. At higher temperatures the chemicals evaporate spontaneously from the sensor and the chemical purge is not necessary.

  • Page 112: Figure 49 Purge Buttons On Motherboard

    User's Guide _______________________________________________________________________ Starting and Configuring Chemical Purge Using Buttons on Motherboard Start manual chemical purge by pressing simultaneously two PURGE buttons on the motherboard inside the transmitter for a few seconds. Indicator led flashes until purge is complete (up to 6 minutes). 0508-011 Figure 49 Purge Buttons on Motherboard...

  • Page 113: Figure 51 Performing Chemical Purge

    Chapter 4 _________________________________________________________________ Operation Turn on/off the automatic purge by selecting Automatic purge, press ON/OFF button. Set the automatic purge interval by selecting Interval: ..., press SET. Set the purge interval and the unit (hour/day) by using the arrow buttons. The interval must be 1 hour ... 10 days. Press OK. - Select Start-up purge by using the arrow buttons.
  • Page 114 User's Guide _______________________________________________________________________ Type PUR and press ENTER to proceed. The maximum interval is 14400 minutes (=10 days). Example: >pur Interval Purge : OFF ? Interval : 720 min ? Power-up Purge : OFF ? Duration : 120 s ? Settling : 240 s ? Temperature...

  • Page 115: Sensor Heating

    Chapter 4 _________________________________________________________________ Operation Sensor Heating This function is optionally available only in transmitters with ® HUMICAP sensor. It should be used only with the warmed 180 C probe head. The sensor heating is recommended for the high humidity environments where even a small temperature differences can cause water to condense on the sensor.
  • Page 116 User's Guide _______________________________________________________________________ To configure the sensor heating use the XHEAT command without parameters. Enter the values after question mark. The available ranges include the following: Extra heat RH -limit (heating 0 ... 100 %RH (default: 95 %RH) function starts-up above the setpoint) Extra heating temperature 0 ...

  • Page 117: Maintenance

    Screw a new filter on the probe head. When using the stainless steel filter (for oil and fuel cell), take care to tighten the filter properly (recommended force 5 N). New filters can be ordered from Vaisala, see section Options and Accessories on page 136. VAISALA_______________________________________________________________________ 115...

  • Page 118: Figure 52 Changing The Sensor

    User's Guide _______________________________________________________________________ Changing the Sensor The user can change the HUMICAP180 and HUMICAP180L sensors Unscrew the filter from the probe head. See the instructions in section Changing the Probe Filter on page 115. Remove the damaged sensor and insert a new one. Handle the new sensor by the plastic socket.

  • Page 119: Figure 53 Error Indicator And Error Message

    Press the INFO button to display the error message. You can also check the error message via the serial interface by using the command ERRS. In case of constant error, please contact Vaisala, see Vaisala Service Centers on page 144. VAISALA_______________________________________________________________________ 117...

  • Page 120: Table 16 Error Messages

    Clean the probes from dirt, water, ice or other contaminants. Internal ADC read error Internal transmitter failure. Remove the transmitter and return the faulty unit to Vaisala Service. Internal EEPROM read error Internal transmitter failure. Remove the transmitter and return the faulty unit to Vaisala Service.

  • Page 121: Calibration And Adjustment

    It is recommended that calibration and adjustment should be carried out by Vaisala. See section Vaisala Service Centers on page 144. Calibration and adjustment is carried out either by using the push-keys on the motherboard, through the serial port or with the optional display/keypad.

  • Page 122: Figure 54 Adjustment And Purge Buttons

    User's Guide _______________________________________________________________________ 0508-013 Figure 54 Adjustment and Purge Buttons The following numbers refer to Figure 54 above: Indicator led Adjustment button Press the purge buttons simultaneously to start chemical purge (if available) Adjustment menu is displayed only when ADJ button (on the motherboard inside the transmitter) is pressed.

  • Page 123: Relative Humidity Adjustment

    Chapter 6 ___________________________________________________ Calibration and Adjustment Relative Humidity Adjustment Using Push-Buttons A simple push-button adjustment is carried out by using two relative humidity references: 11 % RH (LiCl) and 75 % RH (NaCl). Carry out the chemical purge (if available). LiCl reference Press the ADJ button (see Figure 54 on page 120) on the motherboard to open the adjustment mode.

  • Page 124: Figure 56 Selecting Point 1 Reference Type

    User's Guide _______________________________________________________________________ Using Display/Keypad Note that the difference between the two humidity references must be at least 50% RH. Carry out the chemical purge (if available). Press (opens the ADJUSTMENT MENU). the ADJ button Select Adjust RH measurement, press button. Select 1-point/ 2-point adjustment, press.

  • Page 125: Using Serial Line

    Chapter 6 ___________________________________________________ Calibration and Adjustment Using Serial Line Note that the difference between the two humidity references must be at least 50% RH. Connect the HMT330 to a PC. See section Serial Line Communication on page 63. Open a terminal program. Carry out the chemical purge (if available).

  • Page 126: Relative Humidity Adjustment After Sensor Change

    User's Guide _______________________________________________________________________ >crh 11.25 Ref1 ? c 11.24 Ref1 ? c 11.24 Ref1 ? 11.3 Press any key when ready ... 75.45 Ref2 ? c 75.57 Ref2 ? c 75.55 Ref2 ? c 75.59 Ref2 ? 75.5 > indicates that the adjustment has succeeded and the new calibration coefficients are calculated and stored.

  • Page 127: Temperature Adjustment

    Chapter 6 ___________________________________________________ Calibration and Adjustment Temperature Adjustment Using Display/Keypad Press the ADJ button on the motherboard to open the ADJUSTMENT MENU. If using a warmed probe for measuring, probe heating will be interrupted when ADJ key is pressed. Wait some time for the probe to reach ambient temperature.
  • Page 128 User's Guide _______________________________________________________________________ or for additional T probe: Type C and press ENTER a few times to check if the reading is stabilized. Let the reading stabilize, give the reference temperature after the question mark and press ENTER three times. When using two reference temperatures (2-point calibration) press ENTER only twice and insert the probe to the second reference.

  • Page 129: Analog Output Adjustment

    Chapter 6 ___________________________________________________ Calibration and Adjustment Analog Output Adjustment In the analog output calibration the analog output is forced to the following values: - Current output: 2 mA and 18 mA - Voltage output: 10 % and 90 % of the range Connect HMT330 to a calibrated current/voltage meter in order to measure either current or voltage depending on the selected output type.

  • Page 130: Feeding Adjustment Information

    User's Guide _______________________________________________________________________ Feeding Adjustment Information This information is shown on the device information fields (see section Device Information on page 82.) Using Display/Keypad If you are not in the adjustment menu, press the ADJ button on the motherboard (opens the ADJUSTMENT MENU). Select Adjustment info, press the arrow button.

  • Page 131: Specifications

    Chapter 7 _____________________________________________________________ Technical Data CHAPTER 7 TECHNICAL DATA This chapter provides the technical data of the product. Specifications Performance Relative Humidity Measurement range 0 ... 100 %RH Accuracy (including non-linearity, hysteresis and repeatability) with HUMICAP®180 for typical applications ® HUMICAP 180C for applications with chemical purge...

  • Page 132: Figure 57 Accuracy Over Temperature Range

    User's Guide _______________________________________________________________________ Temperature (+ Operating Pressure Ranges) HMT331 -40 ... +60 °C (-40 ... +140 °F) HMT333 80 ºC -40 ... +80 °C (-40 ... +176 °F) HMT333 120 ºC -40 ... +120 °C (-40 ... +248 °F) HMT334 -70 ...

  • Page 133: Table 18 Calculated Variables (Typical Ranges)

    Chapter 7 _____________________________________________________________ Technical Data Calculated Variables Table 18 Calculated Variables (Typical Ranges) Variable HMT331 probe HMT333 probe HMT334/335/337/338 probes Dewpoint temperature -20 ... +60 ºC -20 ... +80 ºC -20 ... +100 ºC Mixing ratio 0 ... 160 g/kg dry air 0 ...

  • Page 134: Accuracy Of Mixing Ratio G/Kg (Ambient Pressure

    User's Guide _______________________________________________________________________ Accuracy of Mixing Ratio g/kg (Ambient Pressure 1013 mbar) Relative humidity Temp. 0.003 0.003 0.003 0.003 0.003 0.004 0.004 0.004 — — 0.017 0.018 0.019 0.021 0.022 0.023 0.025 0.026 — — 0.08 0.09 0.09 0.10 0.10 0.11 0.11 0.12...

  • Page 135: Figure 58 Accuracy In Dewpoint Measurement

    Chapter 7 _____________________________________________________________ Technical Data Dewpoint Temperature (HMT337 Warmed Probe Option) Find the intersection of the dewpoint temperature curve and the dewpoint difference reading (process temperature-dewpoint temperature) on the x-axis and read the accuracy in dewpoint measurement on the y-axis. 0508-017 Figure 58 Accuracy in Dewpoint Measurement...

  • Page 136: Inputs And Outputs

    User's Guide _______________________________________________________________________ Inputs and Outputs Operating voltage 10 ... 35 VDC, 24 VAC with optional power supply module 100 ... 240 VAC, 50/60 Hz Start-up time after power-up Power consumption @ 20 °C (Uin 24VDC) RS-232 max 25 mA Uout 2 ×...

  • Page 137: Table 19 Transmitter Weights (In Kg/Lb)

    Chapter 7 _____________________________________________________________ Technical Data Transmitter Weights Table 19 Transmitter Weights (in kg/lb) Probe Type Probe Cable Length 10 m HMT333 1.1/2.4 1.2/2.6 1.5/3.3 HMT334 1.4/3.1 1.6/3.5 1.9/4.2 HMT335 1.3/2.9 1.4/3.1 1.7/3.7 HMT337 1.2/2.6 1.3/2.9 1.5/3.3 HMT338 178 mm 1.3/2.9 1.5/3.3 1.7/3.7 HMT338 400 mm 1.4/3.1...

  • Page 138: Relay Module

    User's Guide _______________________________________________________________________ Relay Module Operating temperature range -40 ... +60 ºC (-40 ... +140 ºF) Operating pressure range 500 ... 1300 mHg Power consumption @24 V max 30 mA Contacts SPDT (change over), for example, Contact arrangement Form C Imax 0.5 A 250 VAC Imax...
  • Page 139 Chapter 7 _____________________________________________________________ Technical Data Description Item code TRANSMITTER MOUNTING ACCESSORIES Wall Mounting Kit 214829 Installation Kit for Pole or Pipeline 215108 Rain Shield with Installation Kit 215109 DIN Rail Clips with 215094 Installation Plate Meteorological Installation Kit HMT330MIK Panel Mounting Frame 216038 PROBE MOUNTING ACCESSORIES HMT334...
  • Page 140 User's Guide _______________________________________________________________________ Description Item code CABLE BUSHINGS Cable Gland M20x1.5 for 8 ... 11mm 214728SP Cable Cable Gland M20x1.5 for 214729 11 ... 14mm Cable Conduit Fitting M20x1.5 for NPT1/2 214780SP Conduit Dummy Plug M20x1.5 214672SP WINDOWS SOFTWARE Software Interface Kit 215005 OTHER Calibration Adapter for HMK15...

  • Page 141: Figure 59 Transmitter Body Dimensions

    Chapter 7 _____________________________________________________________ Technical Data Dimensions (in mm) 0506-035 Figure 59 Transmitter Body Dimensions VAISALA_______________________________________________________________________ 139...

  • Page 142: Figure 60 Hmt331 Probe Dimensions

    User's Guide _______________________________________________________________________ HMT331 12 (0.47) 0508-030 Figure 60 HMT331 Probe Dimensions HMT333 0507-014 Figure 61 HMT333 Probe Dimensions 140 __________________________________________________________________ M210566EN-D...

  • Page 143: Figure 62 Hmt334 Probe Dimensions

    Chapter 7 _____________________________________________________________ Technical Data HMT334 0503-028 Figure 62 HMT334 Probe Dimensions HMT335 0508-020 Figure 63 HMT335 Probe Dimensions The flange is available as an option for the HMT335 probe. VAISALA_______________________________________________________________________ 141...

  • Page 144: Figure 64 Hmt337 Probe Dimensions

    User's Guide _______________________________________________________________________ HMT337 0507-017 Figure 64 HMT337 Probe Dimensions HMT338 0508-078 Figure 65 HMT338 Probe Dimensions Temperature Probe 0508-024 Figure 66 Optional Temperature Probe Dimensions 142 __________________________________________________________________ M210566EN-D...

  • Page 145: Technical Support

    Pack the faulty product using an ESD protection bag of good quality with proper cushioning material in a strong box of adequate size. Contact the Vaisala Service Center nearest to you and send the box to the addresses on page 144: VAISALA_______________________________________________________________________ 143...

  • Page 146: Vaisala Service Centers

    User's Guide _______________________________________________________________________ Vaisala Service Centers Vaisala Service Centers perform calibrations and adjustments as well as repair and spare part services, see contact information below. Vaisala Service Centers offer also extended services, for example accredited calibrations, maintenance contracts and calibration reminder program.

  • Page 147: Probe Installation Kits And Installation Examples

    Duct installation kit includes a flange, a sealing ring, a supporting bar and probe attaching part for the sensor head and screws for attaching the flange to the duct wall. Vaisala order codes: 210697 (for HMT333 and HMT337), 210696 (for HMT335, no supporting bar), and 215003 for temperature probe.

  • Page 148: Duct Installation Kit For Temperature Probe (For Hmt337)146

    User's Guide _______________________________________________________________________ Duct Installation Kit for Temperature Probe (for HMT337) Vaisala duct installation kit for the T-probe includes flange, supporting bar, probe attaching part, sealing ring and the fixing screws (4 pcs). Vaisala order code: 215003. 0507-018 Figure 68...

  • Page 149: Pressure Tight Swagelok Installation Kits (For Hmt337)

    Pressure Tight Swagelok Installation Kits (for HMT337) RH Probe Installation Swagelok installation kit for the relative humidity probe includes Swagelok connector with ISO3/8" or NPT1/2" thread. Vaisala order codes: SWG12ISO38 or SWG12NPT12. 0508-032 Figure 69 Swagelok Installation Kit for RH-probe...

  • Page 150: Examples Of Vapor Tight Installations With Cable Gland

    0508-018 Figure 72 Probe Head Installation with Cable Gland Probe head installation with cable gland is not available from Vaisala. The following numbers refer to Figure 72 above: 1 = AGRO 1160.20.145 (T= -40 ... +100 ºC) Not available from Vaisala.

  • Page 151: T- Probe Installations (Hmt337)

    T- Probe Installations (HMT337) 0508-015 Figure 73 Vapor Tight Installation Vapor Tight Installation is not available from Vaisala. The following numbers refer to Figure 73 above: Cable gland. For example AGRO 1100.12.91.065 (T= -25 ... +200 ºC) In pressurized processes, use a locking ring (example: 6x 0.7 DIN471)

  • Page 152: Example Of Climate Chamber Installation

    Stainless steel cable tie or similar fastener To be sealed (silicone) Temperature probe Relative humidity probe HMP247CG, Cable gland AGRO (available from Vaisala) NOTE Let the cables hang loosely to prevent condensed water running to the sensor head. 150 __________________________________________________________________ M210566EN-D...

  • Page 153: Example Of Installation Through Roof

    Appendix A _________________________________ Probe Installation Kits and Installation Examples Example of Installation Through Roof Outdoor environment Process: For example +85 ºC, 85 %RH 0507-015 Figure 76 Example of Installation through Roof The following numbers refer to Figure 76 above: Insulated probe cables Sealings Roof Cable gland for temperature probe (for example: AGRO 1100.12.91.065)

  • Page 154: Ball Valve Installation Kit For Hmt338

    User's Guide _______________________________________________________________________ Ball Valve Installation Kit for HMT338 The ball valve installation kit (Vaisala order code: BALLVALVE-1) is preferred when connecting the probe to a pressurized process or pipeline. Use the ball valve set or a 1/2" ball valve assembly with a ball hole of Ø14 mm or more.
  • Page 155 Appendix A _________________________________ Probe Installation Kits and Installation Examples The following numbers refer to Figure 77 on page 152: = Manual press handle = Handle of the ball valve = Tighten clasp nut first manually; probe is then sliding easily. Finally tighten with a fork spanner about 60º...

  • Page 156: Meteorological Installation Kit (For Hmt337)

    User's Guide _______________________________________________________________________ Meteorological Installation Kit (for HMT337) The Vaisala meteorological Installation Kit HMT330MIK (Vaisala order code: HMT330MIK) enables the HMT337 to be installed outdoors to obtain reliable measurements for meteorological purposes. For more information, see HMT330MIK brochure and order form.

  • Page 157: Appendix Bcalculation Formulas

    Appendix B _______________________________________________________ Calculation Formulas APPENDIX B CALCULATION FORMULAS The HMT330 series transmitters measure relative humidity and temperature. From these values dewpoint, mixing ratio, absolute humidity and enthalpy in normal pressure are calculated using the following equations: Dewpoint: is the water vapor pressure. The parameters A, m, and T depend on temperature according to the following table (* used for frostpoint calculation if the dewpoint is negative):...
  • Page 158 User's Guide _______________________________________________________________________ Mixing ratio: where coefficient, depends on the molecular weight of the gas (for example, for water vapor B = 621.99 water vapor saturation pressure (hPa) atmospheric pressure (hPa) Absolute humidity: Enthalpy: The water vapor saturation pressure P is calculated by using two equations (5 and 6): where:...
  • Page 159 Appendix B _______________________________________________________ Calculation Formulas where: b i = coefficients -0.58002206 * 10 4 b -1 = 0.13914993 * 10 1 b 0 = -0.48640239 * 10 -1 b 1 = 0.41764768 * 10 -4 b 2 = -0.14452093 * 10 -7 b 3 = b 4 = 6.5459673...
  • Page 161 www.vaisala.com...

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