USER'S GUIDE ® Vaisala HUMICAP Humidity and Temperature Transmitter Series HMT100 M210701EN-D
PUBLISHED BY Vaisala Oyj P.O. Box 26 FI-00421 Helsinki Finland Phone (int.): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at http://www.vaisala.com/ © Vaisala 2009 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. The contents are subject to change without prior notice.
________________________________________________________________________________ Table of Contents CHAPTER 1 GENERAL INFORMATION............................................................................ 6 About This Manual ................................................................... 6 Version Information ............................................................... 6 Related Manuals ................................................................... 6 General Safety Considerations .............
User's Guide ______________________________________________________________________ Calibration and Adjustment...................................................28 Relative Humidity Adjustment Using Push Buttons.............28 Adjustment with HM70 ........................................................29 Field Checking and Adjustment Using a Calibrated Reference Probe ............................................................30 One-Point Adjustment Using a Calibrator ......................
________________________________________________________________________________ List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19 Figure 20 HMT100 Components .............................................................. 13 Plastic Wall Assembly Plate (Spare Part No. GM45160)......... 15 Plastic Wall Assembly Plate with Aluminum Installation Plate.
User's Guide ______________________________________________________________________ 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 the Humidity and Temperature Transmitter HMT100.
Chapter 1 ________________________________________________________ General Information General Safety Considerations Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning alerts you to a serious hazard. If you do not read and follow instructions very carefully at this point, there is a risk of injury or even death. CAUTION Caution warns you of a potential hazard.
User's Guide ______________________________________________________________________ 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. To make sure you are not delivering high static voltages yourself: - Handle ESD sensitive components on a properly grounded and protected ESD workbench.
Chapter 1 ________________________________________________________ General Information Trademarks 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. Warranty For certain products Vaisala normally gives a limited one-year warranty.
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Chapter 2 __________________________________________________________ Product Overview CHAPTER 2 PRODUCT OVERVIEW Thank you for choosing the Vaisala HUMICAP® Humidity and Temperature Transmitter Series HMT100. This chapter introduces you to its features. The Vaisala range of relative humidity measurement instruments covers all the applications from ventilation to process control in demanding explosive areas.
User's Guide ______________________________________________________________________ Fixed and Remote Probe Models The HMT100 is available either with a fixed probe (0.1 m probe cable) or a remote probe with different cable lengths (3/5/10 m cable lengths. A 10 m extension cable is also available; see Table 12 Options and Accessories on page 48). The HMP100 relative humidity probe used in the HMT100 transmitter is fully interchangeable.
Chapter 2 __________________________________________________________ Product Overview 0603-048 Figure 1 HMT100 Components The following numbers refer to Figure 1 above: 1 2 3 4 5 = = = = = Transmitter housing; transmitter cover Probe cover Probe cable HMP100 probe Filter See Table 12 on page 48 for spare part numbers.
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Chapter 3 _______________________________________________________________ Installation CHAPTER 3 INSTALLATION Mounting Wall Mounting With Plastic Wall Assembly Plate (Provided) 1. 2. Attach the wall assembly plate to the wall with two screws. Press the transmitter down so that it slides along the rails of the mounting plate. 0505-171 Figure 2 Plastic Wall Assembly Plate (Spare Part No.
User's Guide ______________________________________________________________________ With Optional Aluminum Wall Installation Plate 1. 2. 3. Attach the aluminum plate to the wall. Attach the plastic wall assembly plate (provided) to the aluminum plate with two screws. Press the transmitter down so that it slides along the rails of the wall assembly plate.
Chapter 3 _______________________________________________________________ Installation Installation with Rain Shield The installation kit with rain shield includes a metal mounting plate and a rain shield for the transmitter. Vaisala order code: 215109. 0505-340 Figure 4 1. 2. 3. 4. NOTE Installation with Rain Shield (Spare Part No. 215109) Fasten the metal mounting plate to the wall or pole with screws (see Figure 4 above). Note the arrow on the mounting plate.
User's Guide ______________________________________________________________________ Installation with Radiation Shield DTR502 with probe installation kit includes a rain/solar radiation shield DTR502 and a plastic installation support for the humidity probe. Vaisala order code: DTR502B. If you already have the DTR502 shield and need only the installation support for the probe, it is available with Vaisala order code 210623. 1. 2. 3.
Chapter 3 _______________________________________________________________ Installation Duct Installation Kit The duct installation kit includes a plastic pipe with a flange (Vaisala order code: 215619). To install the HMP100 probe with the duct installation kit, drill a hole to the duct wall, assemble the probe to the duct installation kit, slide the probe head through the hole, and attach the flange to the duct wall with four screws. See pages 20 and 21 for details.
User's Guide ______________________________________________________________________ Probe Assembly with Duct Installation Kit 1 2 3 0505-177 Figure 7 Assembly of the Humidity Probe with the Duct Installation Kit The following numbers refer to Figure 7 above: 1 2 3 1. 2. 3. = = = HMP100 Duct installation kit Probe cable Slide the probe cable through the duct installation kit plastic pipe. Attach the probe cable to the HMP100 Humidity Probe. Attach probe assembly to the duct.
Chapter 3 _______________________________________________________________ Installation Drilling Instructions for Duct Installation Kit .2 Ø3 42 4 Ø2 3 2 1 0505-178 Figure 8 Drilling Instructions The following numbers refer to Figure 8 above: 1 2 3 = = = Mounting screw Tension screw HMP100 assembled in duct installation kit plastic pipe Drill the holes for the duct installation kit as follows: 1. 2. Use a 24-mm drill bit to drill a hole to the duct wall for the humidity probe.
User's Guide ______________________________________________________________________ Connections 0505-179 Figure 9 HMT100 Connection Board The following numbers refer to Figure 9 above: 1 2 3 = = = 4 5 6 7 = = = = 1. 2. 3.
Chapter 3 _______________________________________________________________ Installation NOTE If an isolated output is required with current outputs, both channels require their own power supply. CH1 is always required to be powered because CH1 is the main output, and the transmitter will not operate if only CH2 is connected. 4. Close the cover and tighten the cover screws. The transmitter is ready for use.
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Chapter 4 ______________________________________________________________ Maintenance CHAPTER 4 MAINTENANCE This chapter provides information that is needed in basic maintenance of the product. Replacing the HUMICAP® Sensor Fixed Probe Model 1. 2. 3. 4. The end of the plastic probe cover is detachable. Carefully turn the end about 1/6 of a turn to loosen it. Remove the end of the probe cover and the filter. Remove the damaged sensor and insert a new one. Recalibrate the transmitter.
User's Guide ______________________________________________________________________ Removing and Fastening the Probe Fixed Probe Model Remove and replace the probe as follows: 1. 2. 3. 4. 4 5. 3 6. 2 7. Loosen the plastic probe cover by carefully turning it counter clockwise. Remove the probe cap and the O-ring. Remove the probe cover. The probe is now exposed. Unscrew the small sleeve that is securing the probe in place and pull out the probe.
Chapter 4 ______________________________________________________________ Maintenance Remote Probe Model 1. 2. Unscrew the small sleeve that secures the probe in place at the end of the probe cable and pull out the probe. Replace the probe and screw the small sleeve back on, securing the probe tightly in place.
User's Guide ______________________________________________________________________ Calibration and Adjustment Calibrate and adjust the HMT100 using the push-buttons on the motherboard or with portable humidity meters HM70 or HMI41. A calibrator kit is needed for calibration against saturated salt solutions. The HMK15 Humidity Calibrator and pre-measured certified salts are available from Vaisala. For further information, please contact your Vaisala representative.
Chapter 4 ______________________________________________________________ Maintenance 3. 4. 5. 6. 7. 8. 9. 10. 11. Press the ADJ button on the transmitter motherboard. An indicator LED lights up. Insert the probe into the measurement hole of the LiCl salt chamber. The indicator LED blinks evenly, indicating that the measurement is changing. Wait for 30 minutes or until the indicator LED stops blinking and is lit continuously, which means that the measurement has stabilized.
User's Guide ______________________________________________________________________ Connect the 211339 HM70-connection cable to the SERVICE PORT connector on the HMT100 motherboard (see Figure 9 on page 22). Connect the other end of the connection cable to either of the HM70's connector ports located on the bottom of the indicator (see Figure 14 above). Turn on both devices (or just HM70, in case that HMT100 is on continuously).
Chapter 4 ______________________________________________________________ Maintenance One-Point Adjustment Using a Calibrator When adjusting the transmitter in only one reference condition, please take care that the reference condition represents the measuring environment. MI70 indicator is used now only as a terminal for visualizing and setting the transmitter's RH reading. Follow steps 1 to 7 on page 30 and continue as follows: 8.
User's Guide ______________________________________________________________________ Two-Point Adjustment Using a Calibrator Note that the difference between the two reference humidities must be at least 50 %. MI70 indicator is used now only as a terminal for visualizing and setting the transmitter's RH reading. Follow steps 1 to 7 on page 30 and continue as follows: 8. Remove the filter from the transmitter's probe and insert the probe head into the lower humidity reference condition. 9.
Chapter 4 ______________________________________________________________ Maintenance 10. Choose LiCl-NaCl autom. from the MI70 adjustment menu and press SELECT. Press OK to accept the note telling about references. 11. Press READY when the reading has stabilized in the LiCl salt chamber (may take 30 minutes or more). You can follow the stabilization from the GRAPH display. 12. Remove the probe from the LiCl salt chamber and insert the probe head into the NaCl salt chamber. 13.
User's Guide ______________________________________________________________________ Adjustment with HMI41 You can check and adjust the HMT100 relative humidity measurement with the HMI41 indicator and HMP41/45/46 probes. A HMI41connection cable is needed. Vaisala order code: 25917ZZ. There are three adjustment modes available: offset (dry point), gain (wet point), and two-point adjustment.
Chapter 4 ______________________________________________________________ Maintenance Connections and Selecting the Calibrator Function 1. To select the calibrator function from the HMI41, press the ON/OFF button until you can see some text on the display. Then release the ON/OFF button and within 1 ... 2 seconds, press both ENTER and MODE buttons until the following display appears: 2.
User's Guide ______________________________________________________________________ Offset and Gain Adjustments Offset and gain adjustments are performed in the same way (they differ only in internal calculations), so this section is valid for both methods. 4. Connect the 25917ZZ HMI41-connection cable to the SERVICE PORT connector on the HMT100 motherboard (see Figure 9 on page 22). 5.
Chapter 4 ______________________________________________________________ Maintenance 9. Let the readings stabilize (may take 30 minutes or more). If you prefer, you can change the display to show the difference in the readings. Press HOLD and a display similar to the following appears: RH % The numbers on the first line indicate how much the transmitter reading differs from that of the HMI41 reference probe. The numbers on the second line indicate the reference probe reading.
User's Guide ______________________________________________________________________ 9. Let the readings stabilize and press MODE. The following display appears: RH % set The HMI41 now works only as a terminal for setting the humidity reading. The numbers on the first line are blinking, and the numbers on the second line indicate the transmitter reading. 10. You can now set the blinking reading to the correct value (for example, the equilibrium RH of a salt solution) with the buttons ▲ and ▼.
Chapter 4 ______________________________________________________________ Maintenance Troubleshooting Table 4 presents a summary of the error messages that may appear during adjustment with the HMI41. Table 4 Common Problems During Adjustment and Their Remedies Error Message RH Probable Cause This message may appear, for example, if the difference between the reference humidities is too small (< 50 %RH). This message may appear during adjustment when the HMI41 is trying to contact the transmitter.
User's Guide ______________________________________________________________________ Analog Output Tests HMT100 has a built-in software function for testing the analog outputs. To test the outputs, do the following: 1. 2. Make sure the transmitter is not in adjustment mode. Press the 75 % adjustment button (see Figure 13 on page 28). This sets the output current/voltage level to the middle point of the selected output range (specified when ordering the product).
Chapter 5 ___________________________________________________________ Troubleshooting CHAPTER 5 TROUBLESHOOTING This chapter describes error messages and provides contact information for Technical Support and Vaisala Service Centers. Error Mode Current Output In error mode the analog outputs switch to IOUT = 23 mA. Error mode indication covers only transmitter body electronic functions. The transmitter cannot indicate a faulty RH probe.
User's Guide ______________________________________________________________________ Return Instructions If the product needs repair, please follow the instructions below to speed up the process and to avoid extra costs to you. 1. 2. 3. 4. 5. Read the section Warranty on page 9. Contact a Vaisala Service Center or a local Vaisala representative. The latest contact information and instructions are available from www.vaisala.com. Addresses of the Service Centers are provided on page 43.
Chapter 5 ___________________________________________________________ Troubleshooting 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 also offer accredited calibrations, maintenance contracts, and a calibration reminder program. Do not hesitate to contact them to get further information.
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Chapter 6 ____________________________________________________________ Technical Data CHAPTER 6 TECHNICAL DATA This chapter provides the technical data of the product. Specifications Table 5 Relative Humidity Measurement Specifications Property Measurement range Accuracy against factory standards including non-linearity, hysteresis, and repeatability at +15 ... +25 °C at 0 ... +40 °C at -40 ... 0 °C and +40 ...
User's Guide ______________________________________________________________________ 0505-247 Figure 18 Accuracy of Temperature Measurement Table 7 Dewpoint Temperature (Calculated) Measurement Specifications Property Measuring range Accuracy Table 8 Temp. -20 -10 0 10 20 40 60 80 Table 9 Description / Value -20 ... +80 °C (+4 ... 176 °F) see Table 8 below Accuracy of Dewpoint Temperature Measurement Relative humidity 10 20 30 2.6 1.7 1.4 2.7 1.7 1.3 2.3 1.4 1.1 2.3 1.4 1.1 2.2 1.2 1.0 3.0 1.9 1.
Chapter 6 ____________________________________________________________ Technical Data Table 10 Inputs and Outputs Property Current output version Two-wire output signal External loop load with 4 ... 20 mA Description / Value 4 ... 20 mA (loop powered) 10 ... 35 VDC (RL = 0 ohms) 20 ... 35 VDC (RL = 500 ohms) Voltage output version Supply voltage 10 ... 35 VDC, 24 VAC Current consumption, 35 VDC/24 VAC Voltage output signals max 12 mA External load with voltage output Table 11 0 ... 1 V, 0 ...
User's Guide ______________________________________________________________________ Table 12 Options and Accessories Description Sensor head HMP100 Humidity sensor T-sensor PT1000 Filter plastic grid + membrane Sintered stainless steel filter Extension cable 10 m Probe cable 0.
Chapter 6 ____________________________________________________________ Technical Data Dimensions in mm (inches) 0505-188 Figure 19 Dimensions HMT100 Fixed Probe Model VAISALA _______________________________________________________________________ 49
User's Guide ______________________________________________________________________ 137.5 5.41 119 4.69 119 4.69 33.5 1.32 71 2.8 Ø 12 0.
____________________________________________________________________ Technical Data VAISALA _______________________________________________________________________ 51
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