Related Manuals for Vaisala HMT370EX
Summary of Contents for Vaisala HMT370EX
- Page 1 M212305EN-A User Guide Intrinsically Safe Humidity and Temperature Transmitter Series HMT370EX...
- Page 2 English versions are This product contains software developed applicable, not the translations. by Vaisala or third parties. Use of the The contents of this document are subject software is governed by license terms and to change without prior notice.
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Page 3: Table Of Contents
About this document..................7 Version information..................7 Related manuals....................7 Documentation conventions................7 Trademarks......................7 Product overview.................... 9 Introduction to HMT370EX series..............9 Basic features and options................9 Hazardous area safety..................9 Available measurement parameters............. 10 Display options....................11 2.5.1 LED states in transmitter with no display..........12 Connectivity to Vaisala Insight software............ - Page 4 HMP378F calculation model with oil-specific coefficients....70 Calibration and adjustment............... 71 Calibration and adjustment overview............71 Adjusting measurements with Insight............72 Adjusting measurements with HMT370EX local display interface... 72 Analog output adjustment overview............74 9.4.1 Adjusting analog output level with Insight.......... 76 9.4.2...
- Page 5 Table of contents Maintenance....................78 10.1 Overview......................78 10.1.1 Technical support..................78 10.2 Cleaning......................78 10.3 Changing probe filter..................78 Troubleshooting....................80 11.1 Problems and their possible solutions............80 11.2 Error messages....................81 11.3 Restoring factory default settings..............82 Technical data....................84 12.1 Specifications....................84 12.2 HMP371 specifications..................88...
- Page 6 Duct installation example with HMP373 probe and duct installation kit....................35 Figure 17 HMT370EX transmitter dimensions............35 Figure 18 Mounting HMT370EX directly through the transmitter body.... 36 Figure 19 Wiring example using one cable..............39 Figure 20 Wiring diagram with galvanic isolators........... 40 Figure 21 Wiring diagram with Zener barriers............
- Page 7 Humidity measurement accuracy as function of temperature..85 Figure 48 Temperature measurement accuracy over full range......85 Figure 49 measurement accuracy................86 Figure 50 HMT370EX transmitter dimensions............88 Figure 51 Dimensions in mm (inches)................88 Figure 52 Dimensions in mm (inches)................. 89 Figure 53 Dimensions in mm (inches).................
- Page 8 Available measurement parameters for HMP378F and HMP378H..10 Table 5 LED status indicator states................12 Table 6 Cable lead-through accessories..............15 Table 7 HMT370EX series hazardous area classifications........16 Table 8 Allowed ambient temperature ranges............18 Table 9 Intrinsically safe input parameters..............19 Table 10 HMT370EX probe accessories...............
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Page 9: About This Document
Caution warns you of a potential hazard. If you do not read and follow instructions carefully at this point, the product could be damaged or important data could be lost. Note highlights important information on using the product. 1.4 Trademarks Vaisalaâ and HUMICAPâ are registered trademarks of Vaisala Oyj. - Page 10 HMT370EX User Guide M212305EN-A All other product or company names that may be mentioned in this publication are trade names, trademarks, or registered trademarks of their respective owners.
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Page 11: Product Overview
HMT370EX transmitter can be used as a replacement for the long-running HMT360 transmitter series in all HMT360 applications. HMT370EX can be installed directly in explosive areas. It can withstand continuous exposure to potentially explosive environments that contain flammable gases or dust, and requires no additional protective enclosures for operation in either gas or dust environments. -
Page 12: Available Measurement Parameters
M212305EN-A 2.4 Available measurement parameters Table 3 (page 10) lists the available HMT370EX measurement parameter options and their abbreviations and units for the standard probe options HMP371, HMP373, HMP374, HMP375, HMP377, and HMP378. Table 3 Available measurement parameters for HMP371, HMP373, HMP374, HMP375, HMP377, and... -
Page 13: Display Options
O (fuel) Saturation temperature °C (°F) 2.5 Display options The HMT370EX transmitter can be ordered either with a graphical LCD display, or alternatively without a display. The display options are shown in Figure 1 (page 11). Figure 1 HMT370EX transmitter display options... -
Page 14: Led States In Transmitter With No Display
In the display model, probe and transmitter configuration can be carried out either using the 4-button interface of the display, or by connecting the probe or transmitter to Vaisala Insight PC software. In the model without display, all configuration must be carried out with Vaisala Insight PC software. -
Page 15: Transmitter Parts
Figure 2 (page 13), and the internal parts of the transmitter are shown in Figure 3 (page 14). Figure 2 HMT370EX transmitter external parts Detachable probe body Transmitter body (for internal parts, see Figure 3 (page 14)) Graphical LCD display (see... -
Page 16: Cable Gland And Conduit Options
Transmitter service port (M8, requires Vaisala USB cable accessory) 2.7.1 Cable gland and conduit options The HMT370EX transmitter body has two M20x1.5 lead-throughs that can be fitted with cable glands, conduit fittings, and plugs, as required by your application. By default, the transmitter... -
Page 17: Figure 4 Default Plugs In Hmt370Ex Lead-Throughs
HTM370EX. The metal sealing plug (2) can be left in place and used in the final installation, if the right-hand lead-through is not used. Cable glands, conduits, and plugs are available from Vaisala as accessories (listed in Table 6 (page 15)). -
Page 18: Using Htm370Ex Series Transmitters In Hazardous Locations
For wiring information, see the galvanic isolator and Zener barrier wiring diagrams included in this document. HMT370EX does not include a galvanic isolator or a Zener barrier. They can be ordered as optional accessories from Vaisala. WARNING! HMT370EX series transmitters have been designed for use in hazardous locations as specified by the product classification. -
Page 19: Guidelines For Safe Use In Hazardous Conditions
For information on the standards that apply to using HMT370EX based on the classification of the device, see HMT370EX certification documentation and the declarations of conformity related to HMT370EX at www.vaisala.com/declarationofconformity. -
Page 20: Table 8 Allowed Ambient Temperature Ranges
HMT370EX User Guide M212305EN-A The different probe head variants are designed for a range of applications, and have their own specifications. Ensure that the transmitter body, probe body, and probe head are each placed in an environment that matches the specification of the part. For allowed ambient temperature... -
Page 21: Figure 6 Location Of Test Points And Service Port
Chapter 2 – Product overview Intrinsic safety The overvoltage category of HMT370EX transmitters is I (non-mains equipment), and ambient pollution degree is 4, as specified in IEC 60664-1. For intrinsically safe input parameters, see Table 9 (page 19) Table 9 Intrinsically safe input parameters... - Page 22 19)) must only be used in a safe area. Either remove the transmitter from the hazardous area or ensure that a safe work procedure has been implemented in the hazardous area. Only use the Vaisala accessory PC connection cable with the service port.
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Page 23: Probe Options
3.1 HMT370EX probe options overview Figure 7 (page 21) shows the different probe options available for HMT370EX series transmitters. The HMP371 fixed probe option uses a probe head that attaches directly to the probe body. In the other probe options (HMP373, HMP374, HMP375, HMP377, and HMP378), the probe head is attached to the probe body with a cable. -
Page 24: Hmt370Ex Probe Accessories
M212305EN-A More information ‣ Probe installation overview (page 35) 3.1.1 HMT370EX probe accessories Table 10 (page 22) lists the available accessories for each probe option. Table 10 HMT370EX probe accessories Accessory Vaisala item code Models M12 Indigo USB Adapter cable USB2 All models... -
Page 25: Hmp371 Fixed Probe
HMP373 is a small size (ø = 12 mm) general-purpose probe that is suitable for installation into confined spaces such as ducts and channels using the duct installation kit available from Vaisala (item code 210697: see Figure 10 (page 24)). -
Page 26: Figure 10 Left: Installation Kit For Duct Mounting. Right: Installation Flange. Aluminum Or Stainless Steel
HMT370EX User Guide M212305EN-A Specifications The HMP373 probe option has 2 operating temperature range options depending on the cable selected for the probe. The rubber cable option has a temperature range of -40 … +80 °C (-40 … +176 °F). With the Teflon cable option, the temperature range is -40 … +120 °C (-40 …... -
Page 27: Hmp374 Probe For High Pressure Applications
Chapter 3 – Probe options 3.4 HMP374 probe for high pressure applications Dimensions The HMP374 probe option is designed for measurement in pressurized spaces or vacuum chambers. 41 (1.61) 120 (4.72) 170 (6.69) Figure 11 Dimensions in mm (inches) Specifications Table 13 HMP374 for high pressure Property Description/value Temperature range... -
Page 28: Hmp375 Probe For High Temperature Applications
For information on entering environmental compensations with the transmitter display interface or Vaisala Insight PC software, see Environmental compensation and measurement settings overview (page 66). -
Page 29: Hmp377 Probe For High Humidity Applications
Chapter 3 – Probe options Specifications Table 14 HMP375 for high temperature Property Description/value Temperature range -70 … +180 °C (-94 … +356 °F) Probe cable length 2, 5 or 10 meters (6 ft 7 in, 16 ft 5 in, 32 ft 10 in) Probe diameter 13.5 mm (0.53 in) Installation... -
Page 30: Hmp378 Probe For Pressurized Pipelines
(available probe lengths: 226 mm and 448 mm (8.90 in/17.6 in)), HMP378 is easy to install into and remove from a pressurized process. A ball valve kit (Vaisala item code: BALLVALVE-1) is available for connecting the probe to a pressurized process or pipeline: see Attaching ball valve kit to process (page 30). -
Page 31: Figure 14 Dimensions In Mm (Inches)
Chapter 3 – Probe options Dimensions R1/2”ISO7/1 or NPT1/2” 35 (1.37) 14 (0.55) 35 - 157/379 (1.37 - 6.2/14.9) (user adjustable) 188/410 (7.40/16.1) 226/448 (8.90/17.6) Length for standard/optional probes Figure 14 Dimensions in mm (inches) Specifications Table 16 HMP378 for pressurized pipelines Property Description/value Temperature range... -
Page 32: Attaching Ball Valve Kit To Process
HMT370EX User Guide M212305EN-A 3.7.1 Attaching ball valve kit to process G1/2 ISO 228/1 Ø14 Ø14 Ø14 Ø21.5 (drilling) Ball valve handle: must point to the same direction as the ball valve body when installing. Extension nipple, threads G1/2 ISO228/1 and R1/2 ISO7/1. -
Page 33: Hmp378F Probe Option For Measuring Oil Moisture And Temperature
Chapter 3 – Probe options 1. Attach the welding joint to the process pipe or chamber. 2. Apply a sealant (MEGA-PIPE EXTRA No. 7188 or LOCTITEâ No. 542 with activator No. 7649) on the threads of the welding joint and screw the bottom of the ball valve onto the welding joint. -
Page 34: Table 18 Hmp378H Measurement Parameters
HMT370EX User Guide M212305EN-A HMP378H uses the HUMICAPâ L2 sensor designed specifically for oil and fuel measurements. For HUMICAP L2 sensor specifications, see Table 20 (page 85). The following measurement parameters are available for HMP378H: Table 18 HMP378H measurement parameters Parameter... -
Page 35: Installation
4. Installation 4.1 HMT370EX installation overview Figure 15 (page 33) shows an example HMT370EX installation using the HMP373 probe with the probe head mounted with a bracket, and with both lead-throughs fitted with cable glands. Figure 15 Example wall installation with HMP373 probe... -
Page 36: Installation Preparations
• Review the hazardous area information in Guidelines for safe use in hazardous conditions (page 17) for further information on Ex safety requirements related to HMT370EX and specific conditions of use. • When selecting the cable glands and plugs for your application, review the information in Cable gland and conduit options (page 14). -
Page 37: Probe Installation Overview
4.1.2 Probe installation overview Figure 16 Duct installation example with HMP373 probe and duct installation kit HMT370EX transmitters can be used with 6 different probe options that are designed for a variety of applications. The installation options vary from wall mounting (fixed HMP371 probe... -
Page 38: Mounting
Ø 5 mm [0.2 in] Figure 18 Mounting HMT370EX directly through the transmitter body Select a surface (for example, a wall) for installing the transmitter. You can mount the transmitter directly to the installation surface with 2 screws, or use an optional mounting plate that attaches to the back of the transmitter. -
Page 39: Attaching Cable Glands And Conduit Fittings
4 ×Ø 5.5 mm 4.3 Attaching cable glands and conduit fittings The HMT370EX transmitter body has 2 lead-throughs (M20x1.5) for wiring. The combination of cable glands, conduit fittings, and plugs used in the lead-throughs is application-specific, and must be determined by the customer. For information on lead-through accessories available... -
Page 40: Wiring
4.4 Wiring WARNING! Protected installation using galvanic isolators or Zener barriers is mandatory in a hazardous environment. Galvanic isolators and Zener barriers are available from Vaisala as accessories. See Spare parts and accessories (page 93). CAUTION! Ensure that the transmitter is powered correctly. 12 V DC is the minimum voltage in all conditions, measured at the transmitter screw terminals. -
Page 41: Figure 19 Wiring Example Using One Cable
Chapter 4 – Installation CH 2 CH 1 − − 4 – 20 mA 4 – 20 mA 12 – 28 V Figure 19 Wiring example using one cable 1. Prepare the cabling wires as required in your application (cabling either through 1 or 2 lead-throughs). -
Page 42: Wiring With Galvanic Isolators
HMT370EX User Guide M212305EN-A 4.4.1 Wiring with galvanic isolators HAZARDOUS AREA SAFE AREA Test Points DC power supply External grounding terminal Intrinsically safe certified galvanic isolators Controller 4 ... 20 4 ... 20 Controller 4 ... 20 mA If the controller... -
Page 43: Wiring With Zener Barriers
Chapter 4 – Installation 4.4.2 Wiring with Zener barriers HAZARDOUS AREA SAFE AREA Test Points DC power supply External grounding terminal Intrinsically safe certified Zener barriers Controller 4 ... 20 4 ... 20 4 ... 20 Controller 4 ... 20 mA If the controller uses voltage input, U = I*RI... -
Page 44: Finalizing Installation: Closing Transmitter And Attaching Grounding
HMT370EX User Guide M212305EN-A 4.5 Finalizing installation: closing transmitter and attaching grounding 1. Close the transmitter body cover and tighten the captive screws. Tighten the screws to approximately 3.5 Nm: ensure that there is no gap between the covers. 3.5 Nm Ensure that the cover has been tightened sufficiently so that there is no gap between the covers in the area highlighted in the illustration. -
Page 45: Optional: Testing Analog Output Level With A Multimeter
Chapter 4 – Installation 3. Connect the grounding terminal on the bottom of the transmitter to the grounding element of the installation site with a 4 mm grounding wire. 4 mm 4. After grounding the transmitter, switch on the power supply input. 4.6 Optional: testing analog output level with a multimeter CAUTION! -
Page 46: Figure 22 Multimeter Test Point Overview
HMT370EX User Guide M212305EN-A Test Points 20.0 mA Figure 22 Multimeter test point overview If you you want to verify the output level of the analog output channels, test the connection as follows: 1. Detach the probe body and open the transmitter cover. - Page 47 14)) must only be used in a safe area. Either remove the transmitter from the hazardous area or ensure that a safe work procedure has been implemented in the hazardous area. Only use the Vaisala accessory PC connection cable with the service port.
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Page 48: Hmt370 Local Display Interface
5.1 Local display overview Figure 23 HMT370EX local display examples: measurement graph view and main menu screen The display version of the HMT370EX transmitter has graphical LCD display with a 4-button interface. The local display can be used to view measurement information, configure settings, and calibrate and adjust measurements and outputs. -
Page 49: Figure 25 2 Parameter View Example
Chapter 5 – HMT370 local display interface Press and hold Back to return directly to the main menu. Press and hold the Up or Down button to increase or decrease a value faster. Measurement information views The home view of the display has several options for showing the measurement information of the connected probe. -
Page 50: Local Display Pin Code
HMT370EX User Guide M212305EN-A Figure 27 Parameter list view example Configuration options You can configure the following settings with the local display: • Analog output settings (parameters, scaling, fault indication, output test and adjustment) • Measurement settings (environmental compensation and filtering factor) •... -
Page 51: Light And Dark Display Themes
Chapter 5 – HMT370 local display interface 5.1.2 Light and dark display themes Figure 29 Dark (left) and light (right) display theme examples You can select either a Light or Dark display theme to match the lighting conditions of your environment. The Light theme has a light background and dark text and graphics, and the Dark theme has a dark background and light text and graphics. -
Page 52: Hmt370Ex Display Main Menu
HMT370EX User Guide M212305EN-A 5.2 HMT370EX display main menu Figure 31 HMT370EX display interface main menu The first view of the display interface menu contains 4 submenus for different configuration options. See the following sections for more information on each submenu: •... -
Page 53: Display Menu
Chapter 5 – HMT370 local display interface 5.3.1 Display menu Figure 33 Display menu In the Display menu, you can select which parameters are shown on the display, change the local display interface language, and configure graph, unit, display timeout, menu access PIN code, and color theme options. -
Page 54: Analog Outputs Menu
You can force the analog output to a fixed value (options: 4, 12, and 20 mA) and read the fixed output to verify that the transmitter outputs are working correctly. For more information on analog output configuration using the local display or Vaisala Insight PC software, see Analog output configuration overview (page 61). -
Page 55: Calibration Menu
Chapter 5 – HMT370 local display interface 5.4 Calibration menu Figure 35 Calibration menu In the calibration menu, you can adjust the RH or T measurement of the connected probe using 1 or 2 reference points. You can also view information about the currently existing adjustments and reset the adjustment of the connected probe back to default. -
Page 56: Maintenance Menu
HMT370EX User Guide M212305EN-A The Status menu contains options for viewing information about the operation of the device: transmitter and probe status messages, output and measurement status, and general information on the device. Device status Device operation information such as notifications and errors. -
Page 57: Operating With Insight Pc Software
Chapter 6 – Operating with Insight PC software 6. Operating with Insight PC software 6.1 Vaisala Insight PC software Vaisala Insight PC software is a configuration software for Indigo compatible devices. The supported operating systems are Windows 7 (64-bit), Windows 8.1 (64-bit), and Windows 10 (64-bit). -
Page 58: Figure 38 Connecting To Insight: Probe Body And Transmitter Service Port Locations
1. If you want to configure the probe by itself: a. Open the Insight PC software. b. Connect the M12 USB cable (Vaisala item USB2) to a free USB port on the PC. c. Detach the probe body from the transmitter: see Mounting (page 36) for an example. -
Page 59: Installing Driver For The Usb Service Cable
2. If you want to configure the transmitter and probe together as one unit: a. Open the Insight PC software. b. Connect the the M8 USB cable (Vaisala item 219690) to a free USB port on the PC. c. Open the transmitter cover: see Mounting (page 36) for an example. - Page 60 Download the Vaisala USB driver at http://www.vaisala.com/software (select the appropriate USB Instrument Driver Setup for your cable). c. Run the USB driver installation program Vaisala USB Device Driver Setup.exe. Accept the installation defaults. d. Go back to step 1...
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Page 61: Insight Main View With Transmitter
Chapter 6 – Operating with Insight PC software 6.3 Insight main view with transmitter Figure 39 Insight main menu and settings: transmitter view Select to access Insight main menu. • Configure Device: environmental compensation settings, analog output settings, display and graph settings, measurement coefficients, filtering factor, and general settings. -
Page 62: Insight Main View With Probe
• Diagnostics: troubleshooting and administrative information about the device status. Also includes options for exporting the device error log and other diagnostics information as files (CSV/ZIP). When contacting Vaisala support, it is recommended to include an up-to-date export of the error log with the support request. -
Page 63: Analog Output Configuration
Chapter 7 – Analog output configuration 7. Analog output configuration 7.1 Analog output configuration overview HMT370EX has 2 scalable 4 – 20 mA analog output channels. Each output has the following configuration options: • Output parameter selection • Output scale low end and high end •... -
Page 64: Configuring Analog Outputs With Insight
HMT370EX User Guide M212305EN-A 7.2 Configuring analog outputs with Insight Using the Insight PC software, you can configure the measurement parameter sent on each analog output, the scaling of the parameter, clipping and error limits, and the error output level. In addition to configuration, you can also carry out an output test where the output is forced to a fixed level so it can be verified with a multimeter. -
Page 65: Analog Output Level Test
Chapter 7 – Analog output configuration 7.4 Analog output level test If you need to verify that the signal from the HMT370EX transmitter's analog output channel is correct, you can force the output of the channel to a specific value and measure the output level with a multimeter. -
Page 66: Testing Analog Output Level With Insight
HMT370EX User Guide M212305EN-A 3. To start the output test mode with the local display interface, open the Settings > Analog outputs > Test outputs menu. 4. Select an output level to force the output to (4, 12, or 20 mA) and select Start. Verify the output with the multimeter and select Finish when done. - Page 67 Chapter 7 – Analog output configuration 9. After verifying the output, clear the value from the Test output level field and select Save. This switches the Test mode off. CAUTION! The Test mode must always be switched off after verifying the output level to return to normal measurement mode.
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Page 68: Environmental Compensation And Measurement Settings
To show the latest measurement directly in the output, set the filtering factor to 1.000 (no filtering). HMT370EX has 2 alternative filtering factor options: either a default filtering factor that uses a 13 second moving average (T90), or a custom filtering factor defined by the user. -
Page 69: Configuring Pressure Compensation
(page 70). 8.2 Configuring pressure compensation You can configure a pressure compensation value to HMT370EX using either the local display interface or Vaisala Insight PC software. Note that configuring these settings requires using Insight in Advanced Mode. To set a pressure compensation value: 1. -
Page 70: Configuring Filtering Factor
Environmental compensation and measurement settings overview (page 66)). A default or custom filtering factor can be set using either the local display interface or Vaisala Insight PC software. To set a filtering factor: 1. If you are using the local display interface: a. -
Page 71: Configuring Calculation Coefficients
You can configure a compensation value for the molar mass of the ambient gas and oil-specific coefficients to HMT370EX with Vaisala Insight PC software. The oil-specific coefficients (Oil A and Oil B) are only applicable for the HMP378F oil measurement probe option. -
Page 72: Hmp378F Calculation Model With Oil-Specific Coefficients
8.4.2 HMP378F calculation model with oil-specific coefficients For additional accuracy, an oil-specific calculation model can be used in HMP378F. An oil sample has to be sent to Vaisala for modeling. As a result, the specific coefficients (A and B: see formula in... -
Page 73: Calibration And Adjustment
Figure 44 Insight PC software calibration view example Figure 45 Local display calibration menu The RH and T measurement of the probe used in the HMT370EX transmitter can be calibrated and adjusted (1-point or 2-point adjustments) using one of the following alternative configuration options: •... -
Page 74: Adjusting Measurements With Insight
9.3 Adjusting measurements with HMT370EX local display interface The probe connected to HMT370EX can be calibrated and adjusted using the local display interface and a reference device or a calibrator with a known reference concentration. Both RH and T adjustments can be carried out either as 1-point or 2-point adjustments. - Page 75 Chapter 9 – Calibration and adjustment 3. Select the number of points you want to adjust and press Select. 4. When you select either 1 or 2 points, the transmitter shows a notification about starting the adjustment and information about the task. Place the probe near the reference point. 5.
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Page 76: Analog Output Adjustment Overview
12. If you need to restore factory adjustments, select Reset probe in the Calibration menu. 9.4 Analog output adjustment overview If the output level of the HMT370EX transmitter's analog channels appears to be incorrect, you can test and adjust the output level using either Insight PC software or the local display interface. - Page 77 Chapter 9 – Calibration and adjustment CAUTION! The transmitter body enclosure must not be opened in an explosion hazardous area, unless a safe work permit has been issued in accordance with the standard IEC 60079-14. Either remove the transmitter from the hazardous area before opening the enclosure, or ensure that an IEC 60079-14 compliant safe work procedure has been implemented in the hazardous area.
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Page 78: Adjusting Analog Output Level With Insight
HMT370EX User Guide M212305EN-A 9.4.1 Adjusting analog output level with Insight Figure 46 Analog output level adjustment in Insight PC software Enable the adjustment mode with this selection. Start sending a low level test output (4 mA) with this selection. Enter the value measured with the multimeter in the Measured value, low point field. -
Page 79: Adjusting Analog Output Level With Local Display Interface
Chapter 9 – Calibration and adjustment 4. Select > Calibrate > Yes and then either Analog output 1 adjustment or Analog output 2 adjustment. 5. Follow the instructions in the Insight interface to carry out the adjustment. 6. Remove the multimeter, close the transmitter cover, and reattach the probe body. 9.4.2 Adjusting analog output level with local display interface To adjust the output level of analog output channel 1 or 2 with the local display interface: 1. -
Page 80: Maintenance
Do not immerse them in liquid when cleaning, and wipe chemicals off the surfaces after cleaning. 10.3 Changing probe filter Replace the probe filter if it is contaminated. New filters are available from Vaisala. CAUTION! Be careful when changing the filter, since it is easy to break the... - Page 81 Chapter 10 – Maintenance When replacing the filter, wear clean gloves to avoid depositing dirt or oil on the filter. Replace the filter as follows: 1. Turn the filter counterclockwise until it is loose. 2. Pull the filter straight out carefully. CAUTION! Do not damage the sensor.
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Page 82: Troubleshooting
If you have a problem with using HMT370EX, check the following tables before contacting Vaisala. If the problem you have is not listed in the tables, or if the proposed solution does not fix the problem, contact Vaisala technical support. -
Page 83: Error Messages
Settings menu. 11.2 Error messages HMT370EX can display error messages either in Vaisala Insight PC software or in the transmitter's local display. The messages are categorized according to the severity of the status: • Critical errors are fatal to the operation of the device. It may not be able to respond to... -
Page 84: Restoring Factory Default Settings
11.3 Restoring factory default settings You can restore the transmitter and the connected probe back to their factory default settings using Insight software or the local display interface. Doing this will also clear any user adjustment and restore the latest adjustment performed by Vaisala. - Page 85 1. To restore transmitter factory default settings with the local display interface: a. Select Menu > Maintenance > Restore factory settings and confirm with Restore. 2. To restore transmitter factory default settings with Vaisala Insight PC software: a. Connect the transmitter to Insight. See Connecting to Insight PC software (page 55).
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Page 86: Technical Data
HMT370EX User Guide M212305EN-A 12. Technical data 12.1 Specifications Table 19 Measurement performance Property Description/value Relative humidity Measurement range 0 … 100 %RH ±0.8 %RH (0 … 90 %RH) Accuracy at +23 °C (+73.4 °F) ±0.5 %RH (0 … 40 %RH) Factory calibration uncertainty ±0.8 %RH (40 …... -
Page 87: Figure 47 Humidity Measurement Accuracy As Function Of Temperature
Chapter 12 – Technical data Temperature [ ° Figure 47 Humidity measurement accuracy as function of temperature Humidity measurement accuracy specified for dew point temperature of max. 95 °C ( 203 °F). Temperature [ ° Figure 48 Temperature measurement accuracy over full range HUMICAPâ... -
Page 88: Figure 49 A W Measurement Accuracy
HMT370EX User Guide M212305EN-A Property Description/Value Sensor HUMICAPâ L2 ±0.01 a (±1 %RS) Accuracy Factory calibration uncertainty ±0.6 %RH (0 … 40 %RH) ±1.0 %RH (40 … 95 %RH) Temperature Measurement range −40 … +180 °C (−40 … +356 °F) Accuracy at +20 °C (+68 °F) -
Page 89: Table 23 Inputs And Outputs
Chapter 12 – Technical data Table 23 Inputs and outputs Property Description/value Operating voltage 12 – 28 V Analog outputs 2 outputs (two-wire, 4 – 20 mA) Connection via safety barriers Typical accuracy of analog outputs at +20 °C ±0.0625 % full scale Typical temperature dependence of analog 0.005 % / °C (0.005 % / °F) full scale outputs... -
Page 90: Hmp371 Specifications
M212305EN-A 160 [6.3] 59 [2.3] 35.5 124.5 [4.9] 56.5 [2.2] [1.4] [in] Figure 50 HMT370EX transmitter dimensions 12.2 HMP371 specifications Table 25 HMP371 for wall mounting Property Description/value Temperature range -40 … +60 °C (-40 … +140 °F) Probe diameter 12 mm (0.47 in) The HMP371 fixed probe option has a probe head that attaches directly on the probe body, making it suitable for wall mounting applications. -
Page 91: Hmp374 Specifications
Chapter 12 – Technical data Property Description/value Temperature range with rubber cable -40 … +80 °C (-40 … +176 °F) Probe cable length 2, 5 or 10 meters (6 ft 7 in, 16 ft 5 in, 32 ft 10 in) Probe diameter 12 mm (0.47 in) Installation... -
Page 92: Hmp375 Specifications
HMT370EX User Guide M212305EN-A 41 (1.61) 120 (4.72) 170 (6.69) Figure 53 Dimensions in mm (inches) 12.5 HMP375 specifications Table 28 HMP375 for high temperature Property Description/value Temperature range -70 … +180 °C (-94 … +356 °F) Probe cable length 2, 5 or 10 meters (6 ft 7 in, 16 ft 5 in, 32 ft 10 in) Probe diameter 13.5 mm (0.53 in) -
Page 93: Hmp377 Specifications
Chapter 12 – Technical data 41 (1.6) 51 (2.0) 192 (7.56) 253 (9.96) 75 (2.96) 50 (1.97) drilling 16...22 (0.63...0.87) Figure 54 HMP375 probe and stainless steel installation flange. Dimensions in mm (inches). 12.6 HMP377 specifications Table 29 HMP377 for high humidities Property Description/value Temperature range -70 …... -
Page 94: Hmp378 Specifications
HMT370EX User Guide M212305EN-A 37.5 (1.48) 79.5 (3.13) 99.5 (3.92) Figure 55 Dimensions in mm (inches) 12.7 HMP378 specifications Table 30 HMP378 for pressurized pipelines Property Description/value Temperature range -70 … +180 °C (-94 … +356 °F) Pressure range 0 … 4 MPa... -
Page 95: Spare Parts And Accessories
Part number Models Probe accessories M12 Indigo USB Adapter cable USB2 All models accessory for connecting HMT370EX probes to Insight Ball valve ISO 1/2 with welding joint BALLVALVE-1 HMP378 • Pressure range at +20 °C (+68 °F) 0 … 20 bar (0 … 290 psia) (during installation max. -
Page 96: Recycling Instructions
HMP377 12.9 Recycling instructions These recycling instructions guide you on the end-of-life treatment of this Vaisala product. As waste regulations and infrastructure vary in each country, these instructions only indicate the different components to be separated and common ways to handle them. Always follow local requirements when disposing of the product. -
Page 97: Figure 57 Recyclable And Non-Recyclable Parts In Transmitters With No Display
HMT370EX series transmitters and probes have have metal and plastic parts that can be removed for recycling. The gasket of the transmitter body is made of silicone. With the transmitter model with no display, the transmitter body can be recycled as metal after removing the detachable electronics. -
Page 98: Figure 58 Recyclable And Non-Recyclable Parts In Transmitters With No Display After Disposing Of Electronics And Probe
HMT370EX User Guide M212305EN-A Metal Plastic Electrical and electronic waste Silicone Figure 58 Recyclable and non-recyclable parts in transmitters with no display after disposing of electronics and probe The transmitter body and screws can be recycled as metal after the electronics have been... -
Page 99: Figure 59 Recyclable And Non-Recyclable Parts In Transmitters With Display
Chapter 12 – Technical data Recycling instructions for transmitters with display Electrical and electronic waste Silicone Test Points Do not remove this cover Service Port Use only in safe area Plastic Metal Figure 59 Recyclable and non-recyclable parts in transmitters with display •... -
Page 101: Maintenance And Calibration Services
Maintenance and calibration services Vaisala offers comprehensive customer care throughout the life cycle of our measurement instruments and systems. Our factory services are provided worldwide with fast deliveries. For more information, see www.vaisala.com/ calibration. • Vaisala Online Store at store.vaisala.com is available for most countries. - Page 104 www. v aisala.com...