HMM212 User's Guide in English
Contents
1. Insert the probe into the measurement hole of the NaCl chamber 7 Wait for 20 to 40 minutes Check that the reading corresponds within the desired accuracy to the reading given in the calibration table If not connect the jumper to the RH gain pins and adjust the reading with push buttons 9 Check again the reading at the first point and repeat the procedure if necessary tlo J SR Ka O UP O DOWN OQ OJO O O ojojojo T offset RH gain WET RH offset DRY TT gain Figure 5 Calibration Pins and Pushbuttons With the jumper connected to the RH gain pins each pressing of the UP or DOWN button changes the value approximately 0 05 RH at 75 RH With the jumper connected to the RH offset pins each pressing changes the value approximately 0 05 RH With the jumper connected to the T offset pins each pressing of the UP or DOWN button changes the value 0 05 C or 0 05 F in all temperatures With the jumper connected to the T gain pins each pressing changes the value 0 05 C or 0 05 F in the temperature currently prevailing in the process U338EN 1 2 Chapter 5 Calibration Table Calibration Table 5 Greenspan s Calibration Table with Output Values According to the Chosen Scale Temperature C 15 20 25 30 35 F 59 68 77 86 95 LiCl RH 11 3 11 3 11 3 11 3 4 22. description of the fault circumstances in which the fault occurs occurred name and contact information of a technically competent person who can provide further information on the problem Pack the faulty product in a strong box of adequate size with proper cushioning material to avoid damage Include the information specified in step 2 in the box with the faulty product Also include a detailed return address Ship the box to the address specified by your Vaisala contact U338EN 1 2 Chapter 7 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 European Service Center Finland Controlled Environments and Instruments Vanha Nurmij rventie 21 01670 Vantaa FINLAND Phone 358 9 8949 2658 Fax 358 9 8949 2295 North American Service Center Controlled Environments and Instruments 10 D Gill Street Woburn MA 01801 USA Phone 800 408 9456 Fax 1 781 933 8029 Japan Service Center 42 Kagurazaka 6 Chome Shinjuku ku Tokyo 162 0825 JAPAN Phone 81 3 3266 9611 Fax 81 3 3266 9610 China Service Center Floor 2 EAS Building No 21 Xiao Yun Road Dongsanhuan Beilu Chaoyang District Beijing 100027 CHI
3. presented in Figure on page 16 The error is at its greatest when the temperature of the sensor differs from that of the surroundings and the humidity is high A difference of a few degrees in temperature may cause water to condense on the sensor surface Efficient ventilation accelerates the evaporation of the condensed water whereas in an unventilated space it may take hours The HUMICAP 180R sensor returns to its normal functioning as soon as water has evaporated Contaminated water condensing on the sensor may shorten its life span and alter the calibration VAISALA 15 USER S GUIDE dRH RH N UU A UN A N OS Figure 1 20 0 20 40 60 80 100 Temperature C Measurement Error at 100 RH when the Temperature Difference between the Ambient Air and the Sensor is 1 C U338EN 1 2 Chapter 4 Installation CHAPTER 4 INSTALLATION This chapter provides you with information that is intended to help you install this product Selecting Location Finding a suitable site for HMM212 is important for getting representative ambient measurements Select a place that gives a true picture of the environment or process and is as clean as possible Air should flow freely around the sensor Install the sensor head to a sufficient distance from the duct or chamber walls Make sure to insert enough cable to the same space with the probe in order to prevent heat conduction VAISALA 17
4. the T offset or the T gain pins Adjust the reading with UP and DOWN switches see Figure 5 on page 24 Note that during gain adjustment the offset point does not change offset correction gain correction current range before correction current range before correctio e g 4 20 mA l e g 4 20 mA AIIN A after offset correction A after gain correction 20 20 40 60 80 100120 Fe 20 20 40 60 80 100 120 gt Figure 6 Offset and Gain Calibration Examples NOTE After having performed the calibration disconnect the jumper 26 U338EN 1 2 Chapter 6 Maintenance CHAPTER 6 MAINTENANCE This chapter provides information that is needed in basic maintenance of the product Replacing the HUMICAP 180R Sensor and the Filter Remove the damaged sensor and insert a new one Handle the sensor by the plastic socket Recalibrate the transmitter CAUTION Do not touch the sensor element Replace a dirty filter to ensure a maximum lifetime and a fast response for the sensor Replacing Consumables This section describes how to replace consumables Parts List for Consumables Table 6 Available Spare Parts HUMICAP 180R Sensor HUMICAP180R Stainless steel sintered filter HM46670 VAISALA 27 USER S GUIDE 28 This page intentionally left blank U338EN 1 2 Chapter 7 Troubleshooting CHAPTER 7 TROUBLESHOOTING This chapter describes common problems their
5. 0mA mA 5 81 5 81 5 81 5 81 0 20 mA mA 2 26 2 26 2 26 2 26 0 1V V 0 113 0 113 0 113 0 113 0 5V V 0 565 0 565 0 565 0 565 0 10V V 1 13 1 13 1 13 1 13 Temperature C 15 20 25 30 35 F 59 68 77 86 95 NaCl RH 75 6 75 5 75 3 75 1 74 9 4 20mA mA 16 10 16 08 16 05 16 02 15 98 0 20 mA mA 15 12 15 10 15 06 15 02 14 98 0 1V V 0 756 0 755 0 753 0 751 0 749 0 5V V 3 780 3 775 3 765 3 755 3 745 0 10V V 7 56 7 55 7 53 7 51 7 49 If the LiCl solution is used or stored in temperatures below 18 C 64 F the equilibrium humidity of the salt solution may change permanently VAISALA USER S GUIDE Temperature Calibration NOTE The temperature channel of the HMM212 is very stable and the modules have been calibrated at the factory Unless there is a strong reason to believe that the adjustments have changed do not perform a temperature calibration This is a very demanding procedure and requires both expertise and extremely accurate references Furthermore it is important to allow enough time for the stabilization during calibration If for some reason it is necessary to perform the temperature calibration follow attentively the instructions given below Temperature Calibration of an RH and T Module Allow enough time for the instruments to stabilize to the temperature in which calibration is performed Connect a DMM to the temperature current loop Connect a jumper to
6. 4 above 1 For calibration with the HMI41 insert the jumper as indicated here 2 Calibration connector for the HMI41 NOTE The serial communication parameters are 1200 bauds no parity 8 data bits 1 stop bit NOTE When the connection is being established the message CON ERROR blinks on the HMI41 display for a couple of times after which measurement readings appear This is quite normal and requires no action however if the message is not replaced by measurement readings it is an indication of an operation error NOTE Do not interrupt the calibration procedure In case of an interruption or a power failure the normal mode is restored by completing the calibration or resetting the module Reset the module by switching off the supply power of temperature channel 22 U338EN 1 2 Chapter 5 Calibration NOTE During the calibration with HMI41 please note that temperature loop current is not Within the scaling VAISALA With Pushbuttons and a Jumper You can also perform the calibration with pushbuttons and a jumper on the component board see Figure 5 on page 24 In addition you need a digital multimeter DMM There are two push buttons UP and DOWN and four pairs of pins RH offset RH gain T offset and T gain which are connected with the calibration jumper Vaisala recommends using the RH offset pins if the RH is less than 65 RH and the gain pins if the RH is greater than 65 RH For example
7. NA Phone 86 10 8526 1199 Fax 86 10 8526 1155 www vaisala com VAISALA 31 USER S GUIDE 32 This page intentionally left blank U338EN 1 2 Chapter 8 CHAPTER 8 TECHNICAL DATA This chapter provides the technical data of the product Specifications Table 7 Relative Humidity Specifications Technical Data Property Measurement range Description Value 0 100 RH Accuracy including non linearity hysteresis and repeatability 2 RH 0 90 RH 3 RH 90 100 RH Response time 90 at 20 C in still air with sintered filter 60s Typical temperature dependence of electronics 0 02 RH C Sensor HUMICAP 180R Table 8 Temperature Specifications Property Description Value Measurement range 70 180 C Typical accuracy of electronics at 20 C 0 1 C Typical temperature dependence of 0 0025 C C electronics Sensor Pt 1000 RTD 1 3 Class B IEC 751 Table 9 Analog Output Specifications Property Description Value Two analog outputs 4 20 mA Ch1 RH Ch2 T Typical accuracy 0 1 FS Resolution Ch1 0 025 RH Ch2 0 01 FS Typical temperature dependence 0 005 FS C 33 USER S GUIDE Table 10 General Specifications Property Description Value Operating temperature range Probe 70 180 C Electronics 5 55 C Storage temperature range ele
8. USER S GUIDE Dimensions Figure 2 Dimensions in mm inches Electrical Connections Connect wires according to Figure 3 on page 19 18 U338EN 1 2 Chapter 4 VAISALA Installation O fe D O 2 ol TO O N e ro ojo ojo POWER mH T SUPPLY bc or IT eo 5 10 35V mA FQ POWER m 409 RH SUPPLY Go er RH eo 10 35V ma HQ 00 X1 60 O O Figure 3 Electrical Connections of HMM212 Module The following numbers refer to Figure 3 above 1 During normal use leave the jumper as indicated here factory setting 2 Calibration connector for the HMI41 3 Calibration jumper when not in use 19 USER S GUIDE 20 This page intentionally left blank U338EN 1 2 Chapter 5 Calibration CHAPTER 5 CALIBRATION This chapter contains information that is needed to calibrate this product Vaisala recommends a recalibration of the HMM212 module after six months of use After the first recalibration the recommended calibration interval is approximately 12 months However please note that these intervals depend on the operating conditions and the required accuracy When calibrating humidity instruments it is important that the probe the reference instrument and the calibrator are in thermal equil
9. VAISALA USER S GUIDE Vaisala HUMICAP Humidity and Temperature Module HMM212 U338EN 1 2 PUBLISHED BY Vaisala Oyj Phone int 358 9 8949 1 P O Box 26 Fax 358 9 8949 2227 FI 00421 Helsinki Finland 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 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 Sale Table of Contents CHAPTER 1 GENERAL INFORMATION gesvvevnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnsnenenenenenenenenenenenenener 7 About This Manual anarernnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnunevnnnnnnnnnnnnen 7 Contents of This Manual 7 Version Information 8 Related Manuals sauene 8 General Safety Considerations 8 Feedback arv 9 Product Related Safety Precautions rrnnnnvonnnnnnnvvvennnnvnvennn 9 ESD Protection uaislabaikasetlegaemsareendteeideredsesenene 9 Recyelng irene 10 Regulatory Compliance mes 10 Patent NotiCe u ua sasscede
10. a registered trademark of Vaisala Oyj HUMICAP is a registered trademark of Vaisala Oyj Vaisala hereby represents and warrants all Products manufactured by Vaisala and sold hereunder to be free from defects in workmanship or material during a period of twelve 12 months from the date of delivery save for products for which a special warranty is given If any Product proves however to be defective in workmanship or material within the period herein provided Vaisala undertakes to the exclusion of any other remedy to repair or at its own option replace the defective Product or part thereof free of charge and otherwise on the same conditions as for the original Product or part without extension to original warranty time Defective parts replaced in accordance with this clause shall be placed at the disposal of Vaisala Vaisala also warrants the quality of all repair and service works performed by its employees to products sold by it In case the repair or service works should appear inadequate or faulty and should this cause malfunction or nonfunction of the product to which the service was performed Vaisala shall at its free option either repair or have repaired or replace the product in question The working hours used by employees of Vaisala for such repair or replacement shall be free of charge to the client This service warranty shall be valid for a period of six 6 months from the date the service measures were completed This warranty is
11. ctronics 40 70 C Sensor protection Standard Stainless steel sintered filter Connections Screw terminals for 0 5 1 5 mm wires Table 11 Power Supply Specifications Property Description Value Operating voltage 10 35 VDC 34 U338EN 1 2 www vaisala com U3 3 8 EN
12. ds by the edges and avoid touching the component contacts G Recycle all applicable material Dispose of batteries and the unit according to statutory regulations Do not dispose of with regular household refuse Regulatory Compliances The Vaisala HUMICAP Humidity and Temperature Module HMM212 complies with the following performance and environmental test standards The emission and immunity tests have been performed according to standard EN61326 1 Table 3 Emission Tests Setup According to RF field emission CISPR 22 Class B EN55022 Conducted emissions CISPR 22 B EN55022 Table 4 Immunity Tests Test Setup According to Electrostatic discharge IEC 1000 4 2 EN 61000 4 2 Fast transient burst IEC 1000 4 4 EN 61000 4 4 RF field immunity IEC 1000 4 3 EN 61000 4 3 Conducted RF immunity IEC 1000 4 6 EN 61000 4 6 NOTE cable length max 8 meters Surge IEC 1000 4 5 EN 61000 4 5 Voltage dips short IEC 1000 4 11 EN 61000 4 11 interrupts U338EN 1 2 Chapter 1 General Information Patent Notice The Vaisala HUMICAP Humidity and Temperature Module HMM212 is protected by the following patents and patent applications and their corresponding national rights Finnish patent 98861 French patent 6650303 German patent 69418174 Japanese patent 3585973 UK patent 0665303 and US patent 5607564 Trademarks Warranty VAISALA Vaisala Trademark is
13. however subject to following conditions a A substantiated written claim as to any alleged defects shall have been received by Vaisala within thirty 30 days after the defect or fault became known or occurred and 11 USER S GUIDE b the allegedly defective Product or part shall should Vaisala so require be sent to the works of Vaisala or to such other place as Vaisala may indicate in writing freight and insurance prepaid and properly packed and labelled unless Vaisala agrees to inspect and repair the Product or replace it on site This warranty does not however apply when the defect has been caused through a normal wear and tear or accident b misuse or other unsuitable or unauthorized use of the Product or negligence or error in storing maintaining or in handling the Product or any equipment thereof c wrong installation or assembly or failure to service the Product or otherwise follow Vaisala s service instructions including any repairs or installation or assembly or service made by unauthorized personnel not approved by Vaisala or replacements with parts not manufactured or supplied by Vaisala d modifications or changes of the Product as well as any adding to it without Vaisala s prior authorization e other factors depending on the Customer or a third party Notwithstanding the aforesaid Vaisala s liability under this clause shall not apply to any defects arising out of materials designs or instructions
14. iaceatievvcensadvusletutetucaudedsusendin 11 Trademarks 00e ataazcacudsceawsssaceuese rm etes 11 NVarFanty ces cetera NE 11 CHAPTER 2 PRODUCT OVERVIEW nununununununununununununununnnunnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnevene 13 Introduction to HMM212 i vannnunvnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnen 13 CHAPTER 3 TO BE NOTED WHEN MEASURING HUMIDITY 15 CHAPTER 4 INSTALLATION at ads ce cccatecisnaduadusedaceeducvededesvaddandaveunevedduajuvducueiducctue 17 Selecting Location rnnnvrnnnvnnnnnvnnnnnvnnnnvnnnnnnnnnnnnnnnvnnnnnnnnnnnnnnnn 17 Dimensions sister das dad adm da kmnsadebddevnd gade 18 Electrical Connections seems 18 CHAPTER 5 CALIBRATION ea fetcesisvagiedatccdetescnadlecuucesuvedectdueduucendanduuceteveventacedarscdeveseee 21 One Point Humidity Calibration 21 With the HMI41 Indicator and Calibration Cable 21 With Pushbuttons and a Jumper 23 Two Point Humidity Calibration 23 Two Point Humidity Calibration Procedure 23 Calibration Table hernie 25 Temperature Calibration ss 26 Temperature Calibration of an RH and T Module 26 VAISALA USER S GUIDE CHAPTER 6 MAINTENANCE ireann AE a a a aAa 27 Replacing the HUMICAP 180R Sensor and the Filter 27 Replacing Consumables es 27 Parts List for Consumables rerrrnnrvrrrrnnvrrrr
15. ibrium Therefore always allow enough time for stabilization before starting the actual calibration Calibration in the chamber leave the calibrator for example the HMK15 in the chamber overnight with the chamber door open Calibration of a humidity and temperature module allow at least one hour for the stabilization of the calibrator for example HMI41 with a reference probe One Point Humidity Calibration VAISALA With the HMI41 Indicator and Calibration Cable You can calibrate the HMM212 module with the HMI41 indicator and an appropriate calibration cable 19164ZZ Connect the cable to the test connector of the HMM212 module and insert the jumper as indicated in Figure 4 on page 22 For detailed instructions see the following documents Vaisala HUMICAP Indicator HMI41 and Probes HMP41 45 46 User s Guide Calibration of Digital Transmitters with Vaisala HUMICAP Humidity Indicator HMI41 Cables 19164ZZ and 25917ZZ User s Guide 21 USER S GUIDE otAV meme 0 O Q ojo ojo P POWER mA S T SUPPLY or T DE 5 10 35V mA Q O pa POWER mA S RH SUPPLY ar FH D 10 35V ma Q X1 00 O O Figure 4 Calibration Connector for the HMI41 The following numbers refer to Figure
16. n problems their probable causes and remedies and contact information for technical support USER S GUIDE WARNING CAUTION Version Information Table 1 Manual Revisions Manual Code U338EN 1 1 June 1999 U338EN 1 2 This manual December 2009 HUMICAP sensor type has been changed Related Manuals Table 2 Related Manuals Manual Code Manual Name M210316EN A Vaisala HUMICAP Indicator HMI41 and Probes HMP41 45 46 User s Guide M210777EN B Calibration of Digital Transmitters with Vaisala HUMICAP Humidity Indicator HMI41 Cables 19164ZZ and 25917ZZ User s Guide M210185EN C Vaisala Humidity Calibrator HMK15 User s Guide General Safety Considerations Throughout the manual important safety considerations are highlighted as follows 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 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 Note highlights important information on using the product U338EN 1 2 Chapter 1 General Information 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 i
17. ndicate the chapter section and page number You can send comments to us by e mail manuals vaisala com Product Related Safety Precautions The Vaisala HUMICAP Humidity and Temperature Module HMM212 delivered to you has been tested for safety and approved as shipped from the factory 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 CAUTION Do not touch the sensor element 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 To make sure you are not delivering high static voltages yourself Handle ESD sensitive components on a properly grounded and protected ESD workbench When this is not possible ground yourself to the equipment chassis before touching the boards Ground yourself with a wrist strap and a resistive connection cord When neither of the above is possible touch a conductive part of the equipment chassis with your other hand before touching the boards VAISALA 9 USER S GUIDE Recycling Always hold the boar
18. probable causes and remedies and contact information for technical support Troubleshooting Procedure When troubleshooting the product write a problem report consisting of the following issues What failed what worked did not work Where did it fail location and environment When did it fail date immediately after a while periodically randomly How many failed only one defect other same or similar defects several failures in one unit What was connected to the product and to which connectors Input power source type voltage and list of other items lighting heaters motors etc that were connected to the same power output What was done when the failure was noticed Technical Support For technical questions contact the Vaisala technical support E mail helpdesk vaisala com Fax 358 9 8949 2790 VAISALA 29 USER S GUIDE Return Instructions 30 If the product needs repair please follow the instructions below to speed up the process and to avoid extra costs to you Read the section Warranty on page 11 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 in section Vaisala Service Centers on page 31 Please have the following information on hand serial number of the unit date and place of purchase or last calibration
19. provided by the Customer This warranty is expressly in lieu of and excludes all other conditions warranties and liabilities express or implied whether under law statute or otherwise including without limitation ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE and all other obligations and liabilities of Vaisala or its representatives with respect to any defect or deficiency applicable to or resulting directly or indirectly from the Products supplied hereunder which obligations and liabilities are hereby expressly cancelled and waived Vaisala s liability shall under no cir cumstances exceed the invoice price of any Product for which a warranty claim is made nor shall Vaisala in any circumstances be liable for lost profits or other consequential loss whether direct or indirect or for special damages U338EN 1 2 Chapter 2 Product Overview CHAPTER 2 PRODUCT OVERVIEW This chapter introduces the features and advantages of the Vaisala HUMICAP Humidity and Temperature Module HMM212 Introduction to HMM212 The HMM212 modules are designed especially for relative humidity measurements in environmental chamber applications with high temperature and humidity levels The HMM212 module is a microprocessor based instrument with temperature compensation in RH measurements The module includes separate 4 20 mA loop powered RH and T channels The humidity probe length is an order specified option Fur
20. rnnnrvvrrrnnrvrerrnnn 27 CHAPTER 7 TROUBLESHOOTING nd 29 Troubleshooting Procedure ssrerrnnnnvnnnnnnnnvnnnnnnnvnnnnnnnvnnennnnn 29 Technical Support sernnnnvrnnnvnnnnnvnnnnnnnnnnvnnnnnnnnnnnnnnnvnnnnnnnnnnnnnnnn 29 Return Instructions ns 30 Vaisala Service CenterS s rmssrrnsvvnnnvnnnnnvnnnnvnnnnvnnnnnnnnnnnvnnnn 31 CHAPTER 8 TECHNICAL DATA sinne saaniscovccad voce ides ot maman secte nue nanne nnana na 33 Specifications serein aae eais aaa abdin 33 4 U338EN 1 2 List of Figures VAISALA Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Measurement Error at 100 RH when the Temperature Difference between the Ambient Air and the Sensor is 1 C 16 Dimensions in mm inches 18 Electrical Connections of HMM212 Module 19 Calibration Connector for the HMI41 22 Calibration Pins and Pushbuttons rrrrrnnnnrorrrrrenonrnnnrnnrvnnenne 24 Offset and Gain Calibration Examples 0 ccccccceseeeseeees 26 USER S GUIDE List of Tables Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Manual Revisions eronnronnronnrrvnrrnnrrrnnnennrrnnnrnnrrnnnrnsrrnnsensrrensenn 8 Related Manuals nnns 8 Emission Tests 10 Immunity Tests ONA 10 Greenspan s Calibration Table with Outp
21. thermore the customer can also order the module with asuitable cable length 0 65 m 1 50 m or 3 0 m atemperature loop current scaled for that particular application 0 100 C 20 120 C 20 180 C 40 180 C or 70 180 C The HMM212 modules are connected to process control systems with screw terminals These versatile modules incorporate the HUMICAP 180R humidity sensor which uses an operating principle based on changes in the capacitance of a thin polymer film as it absorbs water molecules The HMM212 modules measure temperature with the reliable Pt 1000 sensor VAISALA 13 USER S GUIDE This page intentionally left blank 14 U338EN 1 2 Chapter 3 To Be Noted When Measuring Humidity CHAPTER 3 TO BE NOTED WHEN MEASURING HUMIDITY This chapter describes issues that need to be noted in the measurement of humidity In the measurement of relative humidity and especially in calibration it is essential that the temperature equilibrium is reached Even a slight difference in the temperature between the measured object and the sensor causes an error For example at 20 C 68 F and 50 RH a temperature difference of 1 C between the measured object and the sensor causes an error of 3 RH If relative humidity is 90 RH the error is about 5 4 RH A graph of the measurement error at 100 RH when the temperature difference between ambient air and the sensor is 1 C is
22. to perform a one point humidity calibration using saturated NaCl salt solution at 75 5 RH as a reference do as follows Insert the probe into a NaCl salt chamber and let stabilize 2 Connect a DMM to the RH current loop and wait until the reading stabilizes 3 Connect a jumper to the RH gain pins and adjust the DMM reading with buttons UP and DOWN until the loop current corresponds to 75 5 RH 4 Disconnect the jumper Two Point Humidity Calibration You can also perform a two point calibration with saturated salt calibrators for example HMK15 or you can send the instrument to Vaisala or a Vaisala representative for recalibration Figure 6 on page 26 illustrates the difference between offset and gain calibrations Two Point Humidity Calibration Procedure 1 Leave the calibrator and the probe for at least I hour in the same environment so that their temperatures have time to equalize For information on more accurate stabilization times see Chapter 4 Installation on page 17 2 Insert the probe into the measurement hole of the LiCl salt chamber in the humidity calibrator 3 Wait for 20 to 40 minutes Check the temperature and read the closest corresponding RH value in the calibration table Table 5 on page 25 23 USER S GUIDE 24 5 Connect the jumper to the RH offset pins see Figure 5 below and adjust the output signal with push buttons to the value given in the calibration table Table 5 on page 25
23. ut Values According to the Chosen Scale 25 Available Spare Parts 27 Relative Humidity Specifications 33 Temperature Specifications 33 Analog Output Specifications errrrrannrrnnnnvnnonrrnnnrrrnnnnnnnrnnnnnr 33 General Specifications 34 Power Supply Specifications rrronrrnnrrnnnnvnnnnvvnrrrrrnnnrnnnnnnnnnn 34 U338EN 1 2 Chapter 1 General Information 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 Module HMM212 Contents of This Manual This manual consists of the following chapters VAISALA Chapter 1 General Information provides general notes for the manual and the product Chapter 2 Product Overview introduces the features and advantages of the Vaisala HUMICAP Humidity and Temperature Module HMM212 Chapter 3 To Be Noted When Measuring Humidity describes issues that need to be noted in the measurement of humidity Chapter 4 Installation provides you with information that is intended to help you install this product Chapter 5 Calibration contains information that is needed to calibrate this product Chapter 6 Maintenance provides information that is needed in basic maintenance of the product Chapter 7 Troubleshooting describes commo
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