Intrinsically safe humidity and temperature transmitter series (152 pages)
Summary of Contents for Vaisala HUMICAP HMT360 SERIES
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USER’S GUIDE Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT360 M010056EN-I...
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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...
This chapter provides general notes for the manual and the product. About This Manual This manual provides information for installing, operating, and maintaining the Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT360. Contents of This Manual Chapter 1, General Information: This chapter provides general notes for the manual and the product.
User’s Guide ______________________________________________________________________ Chapter 9, Technical Data: This chapter provides technical data of the product. Appendix A, Dimensions: This appendix contains parts drawings of the transmitter housing, probes and some transmitter mounting accessories with metric and nonmetric dimensions specified. Appendix B, Wiring for Intrinsically Safe Operation, FM: This appendix contains the wiring diagram for intrinsically safe operation approved by Factory Mutual (FM).
Note the following precautions: WARNING Ground the product, and verify outdoor installation grounding periodically to minimize shock hazard. CAUTION Do not modify the unit. Improper modification can damage the product or lead to malfunction. VAISALA _______________________________________________________________________ 11...
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.
Copies of the certificates and wiring diagrams are provided in the following appendices: Appendix B, Wiring for Intrinsically Safe Operation, FM, on page 89 Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page Appendix D, Certificates, on page 93 VAISALA _______________________________________________________________________ 13...
HUMICAP® is a registered trademark of Vaisala Oyj. 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.
PRODUCT OVERVIEW This chapter introduces the features, advantages, and the product nomenclature. Introduction to HMT360 Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT360 contains reliable, microprosessor-based two-wire instruments for measuring relative humidity and temperature in hazardous areas. 0606-003 Figure 1...
User’s Guide ______________________________________________________________________ Output Quantities Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT360 is available either with or without a local display and with one or two current output channels. Available output quantities are listed in the table below: Table 3...
HMP365 probe for high temperatures up to 180 °C *) Flange for HMP365 available as an option HMP367 probe for high humidities HMP368 probe for installations in pressurized pipelines up to 40 bars; features a pressure-tight sliding clasp nut VAISALA _______________________________________________________________________ 17...
During the installation work of the probes in gas group IIC areas (requiring category I devices), it has to be guaranteed that even in fault cases sparks generated by impacts or friction on the surface of the housing can never occur. VAISALA _______________________________________________________________________ 19...
User’s Guide ______________________________________________________________________ Selecting Location Select a place with stable conditions for mounting the transmitter. Do not expose the transmitter to direct sunlight or rain. A rain shield is available and it is recommended for direct outdoor installations. When mounting the probe, select a place representing the process conditions.
If this is not possible and the probe must be inserted from the top, the point of entry must be carefully insulated. For Vaisala probe installation kits and some installation examples see section Probe Mounting on page...
User’s Guide ______________________________________________________________________ Checking the Temperature Reading The actual temperature of the process can be measured with a reference instrument to be compared with the transmitter reading. The heat transfer is less evident if you remove the protective filter of the sensor for a short- term test.
The probe can be detached and replaced when needed by simply unfastening the two Allen screws. 0603-037 Figure 6 Transmitter Mounting The following numbers refer to Figure 6 on page 1 = Mounting plate 2 = Transmitter housing 3 = Allen screw 4 = Allen screws VAISALA _______________________________________________________________________ 23...
User’s Guide ______________________________________________________________________ 0603-038 Figure 7 Parts of the Transmitter The following numbers refer to Figure 7 on page Electronics unit Probe; including a part of the measurement electronics (for example, calibration memory) Flat cable Transmitter base Grounding terminal Protective covers Cable glands Probe RS232C connector...
HMP363 for Confined Spaces The HMP363 is a small size (ø = 12mm) general-purpose probe suitable for ducts and channels with the installation kit available from Vaisala. The HMP363 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.
User’s Guide ______________________________________________________________________ HMP364 for High-Pressure Applications The probe is provided with a nut, a fitting screw and a sealing washer. Keep the fitting screw and the nut in place on the body of the probe during handling to prevent damage to the highly polished surface of the probe. Follow the instructions below to achieve a leak-tight assembly.
User’s Guide ______________________________________________________________________ 0505-274 Figure 11 Cleaning the Tightening Cone The following numbers refer to Figure 11 on page Fitting screw Sealing washer Tightening cone Clean cotton stick CAUTION In pressurized processes it is essential to tighten the supporting nuts and screws very carefully to prevent loosening of the probe by the action of pressure.
Mounting flange HMP367 for High Humidities The HMP367 is for environment where relative humidity is very high, near saturation. Section HMP363/365/367 Duct Installation Kit on page 25 shows mounting of HMP363/367 with the optional duct installation kit. VAISALA _______________________________________________________________________ 29...
User’s Guide ______________________________________________________________________ HMP368 for Pressurized Pipelines or Moisture in Liquids Due to the sliding fit the HMP368 is easy to install into and remove from a pressurized process. The probe is especially suitable for measurements inside pipelines. See section Installing the HMP368 Probe Through a Ball Valve Assembly on page CAUTION...
Mark the fitting screw and the clasp nut. Tighten the nut a further 50 ... 60° (ca. 1/6 turn) with a fork spanner. If you have a suitable torque spanner, tighten the nut to 45 ± 5 Nm (33 ± 4 ft-lbs). VAISALA _______________________________________________________________________ 31...
Installing the HMP368 Probe Through a Ball Valve Assembly 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.
20 bar. NOTE When measuring temperature dependent quantities make sure that the temperature at the measurement point is equal to that of the process, otherwise the moisture reading may be incorrect. VAISALA _______________________________________________________________________ 33...
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User’s Guide ______________________________________________________________________ Follow the steps below to install the HMP368 probe through a ball valve assembly. After the installation, the probe should be sitting in the process chamber or pipeline as shown in Figure 16 on page Shut down the process if the process pressure is more than 10 bars. If the pressure is lower there is no need to shut down the process.
When using the transmitter in hazardous locations, the use of galvanic isolators or barriers is essential. The following barrier & isolator are available in Vaisala: barrier No. 210664 (STAHL 9001/51-280-091-141) and galvanic isolator No. 212483 (STAHL 9160/13-11-11). Examples of connections and more information on installation in hazardous locations is...
User’s Guide ______________________________________________________________________ Installation in Hazardous Locations US and Canadian Requirements USA (FM): Wiring for intrinsically safe operation is shown in Appendix B, Wiring for Intrinsically Safe Operation, FM, on page Canada (CSA): Wiring for intrinsically safe operation is shown in Appendix C, Wiring for Intrinsically Safe Operation, CSA, on page European Requirements CATEGORY 1 (Zone 0)
Chapter 3 _______________________________________________________________ Installation Maximum Cable Resistance Calculation for the Barrier (Vaisala Order Code: 210664) General specifications of HMT360: Supply voltage = 24 V (12 ... 35 V) Maximum current = 20 mA Minimum operating voltage for = 12 V (15 V with serial port)
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User’s Guide ______________________________________________________________________ Calculation of the maximum cable length from barrier to transmitter: = 0.085 Ω/m/core (2 × Cable resistance (as an example) cable 0.085 Ω/m/pair) If assuming that the operating voltage would be ≥ 24 V, the maximum acceptable voltage drop U in cables is: drop drop...
Chapter 3 _______________________________________________________________ Installation HMT360 Connected to a Galvanic Isolator HAZARDOUS AREA SAFE AREA a) current signal controller 0505-278 HAZARDOUS AREA SAFE AREA b) voltage signal controller 0505-279 Figure 17 HMT360 Connected to Galvanic Isolator VAISALA _______________________________________________________________________ 39...
User’s Guide ______________________________________________________________________ HMT360 Connected to a Zener Barrier HAZARDOUS AREA SAFE AREA a) current signal controller 0505-280 0505-281 Figure 18 HMT360 Connected to a Zener Barrier 40 ___________________________________________________________________ M010056EN-I...
User’s Guide ______________________________________________________________________ Grounding When grounding the transmitter, follow the local requirements. Use at least 4 mm grounding cable when grounding the transmitter or barrier. Note that the allowed resistance between barrier and system ground must be less than 1 ohm. Use ground terminal located inside or outside of transmitter Figure 21 on page HAZARDOUS AREA SAFE AREA...
The optional display shows the measurement results. The keypad pushbuttons are indicated (from left to right) as C, Up, Dn, and E (see Figure 22 on page 43): 0603-039 Figure 22 Local Display/Keypad Interface VAISALA _______________________________________________________________________ 43...
User’s Guide ______________________________________________________________________ Power ON/OFF Open the transmitter cover and flip the internal power switch to position ON (up), see Figure 24 on page WARNING Avoid static discharge. Always use a wet cloth for wiping the display. HMT360 with Display Measurement readings appear on the display after switching power ON.
Turn the DIP switches to the desired position according to the table printed on the protective cover. 5: Output quantities Determines whether the output units are metric (down) on non-metric. 6, 7 and 8: Select output quantities VAISALA _______________________________________________________________________ 45...
User’s Guide ______________________________________________________________________ With the three DIP switches on the right, you can select the output quantities according to the table printed on the right side of the protective cover. Note that only the ordered quantities can be selected. The special option gives you the choice of setting any ordered quantity to each channel.
The output quantities metric/non metric DIP switch can be used to select between °C and °F. It is possible to check the pressure setting of the transmitter by pressing button Dn. To return to the temperature reading, press button Dn again. VAISALA _______________________________________________________________________ 47...
User’s Guide ______________________________________________________________________ Selecting Analog Outputs You can select the output quantities for channels 1 and 2 by turning the Calibration Enabled/Disabled DIP switch of the transmitter to position Enabled (up) and the three output selection DIP switches to position special (all up).
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Press button C to exit the display command mode or continue by selecting the output quantities. This menu starts automatically after the scaling menu only if the output selection DIP switches are on the position special (all up) from the beginning. NOTE Remember to restore the DIP switch settings. VAISALA _______________________________________________________________________ 49...
The serial interface MUST NOT be used in hazardous areas. Use the serial interface for calibration and testing purposes in safe areas only. Always use the serial interface cable (optional accessory, Vaisala order code: 25905ZZ). Connect one end of the cable to the serial port of your computer and the other to the connector marked "RS232C"...
°C °F temperature mass ppmw concentration of water water activity H, F 0 ... 1 0 ... 1 relative humidity of saturation saturation °C °F temperature VAISALA _______________________________________________________________________ 51...
User’s Guide ______________________________________________________________________ Example: >asel rh t Ch1 RH lo : 0.00 %RH Ch1 RH hi : 100.00 %RH Ch2 T lo: -40.00 ’C Ch2 T hi: 100.00 ’C > S Scaling Analog Outputs Syntax: S [zz aa.a bb.b]<cr> where = Quantity (RH, T, Td, x, a, Tw, ppm, aw, RS, Ts) aa.a = Lower limit of the quantity bb.b = Upper limit of the quantity...
Before giving command ITEST, reset the transmitter with command RESET, see section RESET Transmitter Reset on page Syntax: ITEST [aa.aaa bb.bbb]<cr> where aa.aaa = Current value to be set for Ch 1 (mA) bb.bbb = Current value to be set for Ch 2 (mA) VAISALA _______________________________________________________________________ 53...
User’s Guide ______________________________________________________________________ This command outputs the current value of each channel and the corresponding control signal of the digital-to-analog converter. Example: >itest 8 12 8.00000 12.00000 >itest 7.00150 11.35429 > The set current values remain valid until you issue the command ITEST without readings or reset the transmitter.
User’s Guide ______________________________________________________________________ NOTE Conversions from mmHg and inHg are defined at 0 °C. FILT Output Filtering Syntax: FILT [a.aaa]<cr> where a.aaa = 0.1 ... 1 No filtering 0.5 = Average of last two measurements 0.1 = Average of ca. 16 measurements This commands sets the measurement result filtering.
When sampling pressurized processes exceeding the maximum measurement pressure of the probe, the pressure in the measurement chamber must be regulated to the acceptable level or below. It is recommended to use pressure regulator before the measurement chamber to prevent remarkable pressure variations. VAISALA _______________________________________________________________________ 57...
In demanding applications it may be advisable to make the first calibration check earlier. Factory Calibration and Adjustment The device (or the probe only) can be sent to Vaisala Service Centers for calibration and adjustment. See section Technical Support on page 72 contact information.
User’s Guide ______________________________________________________________________ First, the electronics unit is removed from the transmitter base to perform the calibration and adjustment in safe area. Second, the power supply and a multimeter is connected to the electronics unit according to the following instructions. Removing the Electronics Unit 0603-040 Figure 24...
The power supply connectors (C1 and C2) MUST NOT be used in hazardous areas. For calibration and adjustment in a hazardous area use only an approved multimeter, which fulfills the safety factors printed on the protective cover. VAISALA _______________________________________________________________________ 61...
User’s Guide ______________________________________________________________________ Calculating Correspondence of Current Values and Output Quantities When using HMT360 without a display, calibration and adjustment is carried out by using a multimeter. Use the following equations to calculate the current values corresponding to the reference output quantities. ⋅...
You must again wait for the measured reading to stabilize (10 ... 15 min). When the transmitter detects that the reading is stable, it automatically stores the correction. The text "Cal Pass" is displayed after the adjustment is performed. NOTE Remember to restore the DIP switch settings. VAISALA _______________________________________________________________________ 63...
User’s Guide ______________________________________________________________________ Calibration enabled RH calibration on Set Lo Set Lo Set Lo Set Lo Wait Set Lo Set Lo Set Lo Set Lo Wait Restore swi t ches 0604-061 Figure 26 Display Chart of the Automatic Adjustment Procedure 64 ___________________________________________________________________ M010056EN-I...
To continue with the high end (two-point) adjustment follow the instructions in the next section. If the low end adjustment is sufficient, press button E again to conclude the calibration. Also restore the DIP switch settings; set the calibration DIP switch to position disabled (down). VAISALA _______________________________________________________________________ 65...
User’s Guide ______________________________________________________________________ High End Adjustment (HMT360 without Display) After having made the low end adjustment, insert the probe into a measurement hole of the NaCl (75 %RH) salt chamber in the humidity calibrator. Please, note that the difference between the two humidity references must be at least 30 %RH.
(when using a multimeter calculate the current value corresponding to the reference humidity by using the equations presented in Calculating Correspondence of Current Values and Output Quantities on page 62). Conclude the one-point adjustment by pressing button E twice. VAISALA _______________________________________________________________________ 67...
User’s Guide ______________________________________________________________________ ACAL Analog Output Calibration Syntax: ACAL<cr> Connect HMT360 to a multimeter. Issue the ACAL command: Disconnect the serial cable from the transmitter while reading the multimeter value for the Ch 1 (I1). Reconnect the serial cable. Type the multimeter reading and press Enter.
Removing the Electronics Unit on page 60 for detailed information. All other maintenance must be performed by qualified Vaisala personnel. If a transmitter is damaged, contact your nearest Vaisala Service Center. See section Product Returns on page 72 for contact information.
Check that the sensor is connected properly. Check if there is condensed water in the probe. If yes, let the probe dry. In case of constant error, contact the Vaisala Helpdesk. See section Technical Support on page 72 for contact information.
User’s Guide ______________________________________________________________________ Technical Support For technical questions, contact the Vaisala technical support by e-mail at helpdesk@vaisala.com. Provide at least the following supporting information: Name and model of the product in question Serial number of the product Name and location of the installation site Name and contact information of a technically competent person who can provide further information on the problem.
180L2 at +20 °C in still air with sintered filter Response time (90 %) for 17 seconds with grid filter HUMICAP® 180R at +20 °C 50 seconds with grid + steel netting in 0.1 m/s air flow 60 seconds with sintered filter VAISALA _______________________________________________________________________ 73...
User’s Guide ______________________________________________________________________ Outputs Table 12 Output Specifications Property Description / Value Two analog outputs (one standard, one two wire 4 ... 20 mA optional) Typical accuracy of analog outputs at ± 0.05 %/°C full scale +20 °C Typical temperature dependence of analog ±...
= 60 °C (140 °F), T5 Japan (TIIS) Ex ia IIC T4 Code number: TC17897 Safety factors = 28 VDC, I = 100 mA, C = 1 nF = 0.7 W, L = 0, T = 60 °C (140 °F) VAISALA _______________________________________________________________________ 77...
User’s Guide ______________________________________________________________________ Canada (CSA) Class I Division 1 and Division 2 Groups A, B, C, D Class II Division 1 and Division 2 Groups G and Coal Dust Class III CSA File No: 213862 0 000 CSA report: 1300863 Safety factors = 60 °C, T4, Intrinsically safe when connected as per...
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Thread Adapter ISO1/2 to NPT1/2 210662SP Sampling Cell with Female DMT242SC Connectors Sampling Cell with Swagelok DMT242SC2 Connectors Ball Valve ISO1/2 with Welding Joint BALLVALVE-1 Installation Flange ISO1/2 DM240FA Manual Press HM36854SP CONNECTION CABLES Serial Interface Cable 25905ZZ VAISALA _______________________________________________________________________ 79...
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User’s Guide ______________________________________________________________________ Table 14 Options and Accessories (Continued) Item Description / Order Code CABLE BUSHINGS Cable Gland M20×1.5 for 7.5...12mm 216587SP Cable Cable Gland M20×1.5 for 10...15mm 216588SP Cable Conduit Fitting M20×1.5 for NPT1/2 214780SP Conduit Dummy Plug M20×1.5 for transmitter 214672SP body OTHER...
Appendix A ______________________________________________________________ Dimensions APPENDIX A DIMENSIONS This Appendix contains parts drawings of the transmitter housing, probes and some transmitter mounting accessories with metric and nonmetric dimensions specified. HMP361 0603-042 VAISALA _______________________________________________________________________ 83...
Appendix B ______________________________________ Wiring for Intrinsically Safe Operation, FM APPENDIX B WIRING FOR INTRINSICALLY SAFE OPERATION, FM This appendix contains the wiring diagram for intrinsically safe operation approved by Factory Mutual (FM). VAISALA _______________________________________________________________________ 89...
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User’s Guide ______________________________________________________________________ CHECKED / Reviewed ACCEPTED / Approved DESCRIPTION / INFO / ECO No. DESIGN HMT360 connection board -Ch1+ -Ch2+ General tolerance Design Material Weigh t Supplier Title code DOCUMEN T CRE ATION D ATA Finish YYY Y-MM-DD INITIAL S Creator Review Size...
Appendix C _____________________________________ Wiring for Intrinsically Safe Operation, CSA APPENDIX C WIRING FOR INTRINSICALLY SAFE OPERATION, CSA This appendix contains the wiring diagram for intrinsically safe operation approved by the Canadian Standards Association (CSA). VAISALA _______________________________________________________________________ 91...
This Appendix contains copies of the EXi intrinsically safe certificates issued for the HMT360 series. VTT IECEx Certificate VTT ATEX Certificates FM Certificate of Compliance CSA Certificate of Compliance TIIS Certificate of Compliance PCEC Conformity Certificate GOST Certificate of Conformity VAISALA _______________________________________________________________________ 93...