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Chapter 4 ________________ Instructions for the Calibration of Humidity Instruments

VAISALA _________________________________________________________ 23

0606-173

Figure 10 Place the thermometer in holders when not

in use

Calibration

Perform the calibration according to the following
instructions:

- Leave the HMK15 calibrator and the probe at the

calibration site for at least 30 minutes before starting the
calibration in order to let the probe temperature stabilize
to the room temperature.

- With lithium chloride it is not necessary to use the

thermometer as the humidity reading changes only very
slightly in the temperature range of +25 ... +30 °C.
However, if you use it make sure that the sleeve is in the
correct position and insert it into the 13.5 mm hole of the
LiCl salt chamber.

NOTE

Handle the thermometer as little as possible and do not
handle it by the measuring end. Press the thermometer
downwards until it passes the O-rings. The thermometer is
correctly in place when you feel a resistance while pressing
it downwards.

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Содержание HMK15

Страница 1: ...USER S GUIDE Vaisala Humidity Calibrator HMK15 M210185EN C ...

Страница 2: ...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...

Страница 3: ...ated Safety Precautions 4 Recycling 5 Warranty 6 CHAPTER 2 PRODUCT OVERVIEW 7 Introduction to Vaisala Humidity Calibrator HMK15 7 General 7 Salt Package Calibration Certificates 9 CHAPTER 3 PREPARING THE SALT SOLUTIONS 11 General Instructions 11 Preparing the Solutions 12 CHAPTER 4 INSTRUCTIONS FOR THE CALIBRATION OF HUMIDITY INSTRUMENTS 19 General Instructions 19 Thermometer 21 Calibration 23 Gre...

Страница 4: ...________________________________________________ 2 _________________________________________________________________ M210185EN C CHAPTER 5 MAINTENANCE 31 CHAPTER 6 SPARE PARTS AND ACCESSORIES 33 CHAPTER 7 TECHNICAL DATA 35 ...

Страница 5: ...la Humidity Calibrator HMK15 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 If you do not read and follow instructions carefully ...

Страница 6: ...nd comments to us by e mail manuals vaisala com Product Related Safety Precautions Note the following precautions CAUTION Do not modify the unit Improper modification can damage the product or lead to malfunction CAUTION Remember to check from the user s guide of your device if the adapter fitting is needed If sensor accidently soaks in salt liquid remove it quickly and rinse with clean water Let ...

Страница 7: ...eneral Information VAISALA _____________________________________________________________________ 5 Recycling Recycle all applicable material Dispose of batteries and the unit according to statutory regulations Do not dispose of with regular household refuse ...

Страница 8: ...ll 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...

Страница 9: ...ertain relative humidity in the air above them The four holes in the chamber cover are designed for Vaisala probes and transmitters with 12 mm 13 5 mm 2 holes and 18 5 mm diameters The salt solutions suitable for the HMK15 calibrator are for example lithium chloride LiCl 11 RH magnesium chloride MgCl2 33 RH sodium chloride NaCl 75 RH and potassium sulphate K2SO4 97 RH In calibration the sensor hea...

Страница 10: ...usage During transportation the chambers can be tightly closed with specially designed transit covers The optional transit bag order code HM27032 helps to transport the calibrator in the vertical position Furthermore the bag can be used for housing the calibrator also during calibration The following photo shows the HMK15 calibrator with some accessories marked with 0606 164 Figure 1 The HMK15 cal...

Страница 11: ...ficates Vaisala s ready dosed salt packages are delivered with calibration certificates given on the basis of a batch check In other words a sample of packages are taken from a batch and salts are prepared according to the instructions given in this manual These salt solutions are then checked at Vaisala Oy s Measurement Standards Laboratory this calibration laboratory is accredited by FINAS a mem...

Страница 12: ...User s Guide ________________________________________________________ 10 _____________________________________________________M210185EN C This page intentionally left blank ...

Страница 13: ...nd easy to prepare with Vaisala s ready dosed salt packages If you do not use ready dosed salt packages measure the salts using the measurement cup provided Make sure that the cup is clean before measuring the salts In the following instructions the required amounts are given in grammes and millilitres The salt solutions must be prepared from salts of pro analysis grade these are available in agen...

Страница 14: ...ithium chloride generates a reference humidity of approximately 11 RH It is normally used as the dry end offset reference NOTE Never add water to dry LiCl salt the salt may heat up so rapidly that it splashes out of the chamber NOTE LiCl is harmful when swallowed the solution is also corrosive NOTE If the LiCl solution is used or stored in temperatures below 18 C its equilibrium humidity changes p...

Страница 15: ...concrete measurements Prepare the salt solutions according to the following instructions Measure the salts carefully if you do not use the ready dosed packages 1 Take the calibrator out of the box Open the transit cover of the chamber Remove the measurement cover from the chamber holder and press the transit cover on the holder see Figure 2 0606 165 Figure 2 Press the transit cover on a chamber ho...

Страница 16: ...nged water into the chamber dry the measurement cup 3 Sprinkle the contents of a salt package or measure the salt according to the table in small quantities into the chamber stirring constantly When measuring with the measurement cup make sure that the cup is clean and dry Rinse and dry the cup after every use LiCl 15 g or 18 ml MgCl2 30 g or 30 ml NaCl 20 g or 15 ml K2SO4 30 g or 20 ml ...

Страница 17: ..._____________________________15 0606 167 Figure 4 Sprinkle a correct dose of salt into the chamber stirring constantly 4 When all salt has been sprinkled into the chamber the saturated salt solution should have the ratio of 60 90 undissolved salt to 10 40 liquid 5 Close the chamber with the chamber cover Figure 5 ...

Страница 18: ...rs without the base plate NOTE The plugs have three steps each of which is suitable for a certain hole diameter the first step for the 12 mm the second step for the 13 5 mm and the third step for the 18 5 mm hole Keep the holes always closed when not calibrating 7 Write the preparation date on a sticker and mark the chamber with it If you use a ready dosed salt package use the sticker with the bat...

Страница 19: ...9 Figure 6 Mark the chamber and covers with stickers 8 Allow approximately 24 hours for stabilization before use so that the salt solution reaches the equilibrium humidity 9 See Chapter 5 Maintenance on page 31 on how to maintain the salt solutions NOTE If you do not use the instrument for a longer period of time close the chambers with transit covers ...

Страница 20: ...User s Guide ________________________________________________________ 18 _____________________________________________________M210185EN C This page intentionally left blank ...

Страница 21: ...differ from the temperature at the calibration site the longer the stabilization time required In laboratory use the calibrator should be stored in that part of the room where the temperature is most stable The calibrator must be kept out of direct sunlight and away from localized heat sources such as spot lights heaters and soldering irons If the probe transmitter is checked against several humid...

Страница 22: ...5EN C NOTE Even the smallest water drop on the probe near the sensors distorts the readings Make sure that chamber covers and plugs are carefully closed 0606 170 Figure 7 Salt chamber The following numbers refer to Figure 7 above 1 HMP233 probe 2 O rings 3 Sensors 4 Max 1 cm 5 Thermometer 6 Saturated salt solution 7 Undissolved salt ...

Страница 23: ...lues Consider also the parallax error which may occur while reading the results The mercury thermometer should be recalibrated within three years in order to maintain the traceability The manufacturer of the thermometer with red capillary liquid provides it with a factory calibration certificate As the accuracy and stability of this kind of a thermometer are inferior to those of a mercury thermome...

Страница 24: ...3 5 mm hole of a salt chamber Press it downwards until it passes the O rings The thermometer is correctly in place when you can feel a resistance while pressing it downwards 0606 172 Figure 9 During calibration the thermometer is inserted into the 13 5 mm hole When the thermometer is not in use or the calibrator is transferred from one place to another place the thermometer in holders Figure 10 ...

Страница 25: ...ration in order to let the probe temperature stabilize to the room temperature With lithium chloride it is not necessary to use the thermometer as the humidity reading changes only very slightly in the temperature range of 25 30 C However if you use it make sure that the sleeve is in the correct position and insert it into the 13 5 mm hole of the LiCl salt chamber NOTE Handle the thermometer as li...

Страница 26: ...quid remove it quickly and rinse with clean water Let it dry before taking into use again Insert the probe into a suitable hole of the LiCl salt chamber Press it downwards until it passes the O rings The shorter the time the hole stays open before inserting the probe the shorter the stabilization time required Wait until the humidity reading stabilizes this takes about 10 30 minutes Read the salt ...

Страница 27: ...ion table Greenspan s Calibration Table below NaCl or K2SO4 solution Adjust the wet end WET gain to correspond to the value given in the calibration table Greenspan s Calibration Table1 C LiCl MgCl2 NaCl K2SO4 0 33 7 0 3 75 5 0 3 98 8 1 1 5 33 6 0 3 75 7 0 3 98 5 0 9 10 33 5 0 2 75 7 0 2 98 2 0 8 15 33 3 0 2 75 6 0 2 97 9 0 6 20 11 3 0 3 33 1 0 2 75 5 0 1 97 6 0 5 25 11 3 0 3 32 8 0 2 75 3 0 1 97 ...

Страница 28: ...alibration 0606 174 Figure 11 Optional Transit Bag for HMK15 When transferring the calibrator from one place to another follow the instructions below Turn the protective sleeve on the thermometer and place the thermometer in the holder Replace chamber covers with transit covers Press chamber covers on vacant chamber holders for transportation During transportation keep the calibrator so that the c...

Страница 29: ...cond step for the 13 5 mm and the third step for the 18 5 mm hole Clean the transit covers with a damp cloth and press them on vacant chamber holders Take the thermometer off the holder turn the sleeve the other way round and perform the calibration according to section Calibration on page 23 In on site calibrations it is important to allow enough time for the calibrator and probe temperatures to ...

Страница 30: ...ture and humidity stabilization In this example an HMP233 probe has been transferred from a temperature of 75 C oven to a suitable hole of the NaCl salt chamber the calibrator is at room temperature The figure shows that after 40 minutes the humidity reading differs 0 2 RH from the final reading 0606 175 Figure 12 An example of RH and T stabilization when the probe is removed from a process ...

Страница 31: ...without the LiCl is 5 C the calibrator is then transferred into room temperature After this an HMP233 probe that has been stored at room temperature is inserted into a suitable hole of the NaCl salt chamber The figure shows that after 40 minutes the reading differs 1 4 RH from the final reading 0606 177 Figure 13 An example of the RH and T stabilization when the transportation and calibration site...

Страница 32: ...User s Guide ________________________________________________________ 30 _____________________________________________________M210185EN C This page intentionally left blank ...

Страница 33: ...epared Please note that the LiCl solution may crystallize on the surface However there may still be solution under the surface Therefore in such cases stir the solution and check it again the next day It is advisable to keep a maintenance log which shows the dates of salt replacements and other maintenance procedures For correct calibration it is essential that salt chambers are tightly closed Che...

Страница 34: ...User s Guide ________________________________________________________ 32 _____________________________________________________M210185EN C This page intentionally left blank ...

Страница 35: ...ate 25130HM Thermometer with red capillary liquid 19729HM Ready dosed LiCl salt package with calibration certificate 19730HM Ready dosed MgCl2 salt package with calibration certificate 19731HM Ready dosed NaCl salt package with calibration certificate 19732HM Ready dosed K2SO4 salt package with calibration certificate 19746HM Plug set 19766HM Salt chamber 19767HM Ion exchanged water 211302SP Adapt...

Страница 36: ...User s Guide ________________________________________________________ 34 _____________________________________________________M210185EN C This page intentionally left blank ...

Страница 37: ...ratures below 18 ºC its equilibrium humidity changes permanently Accuracy lithium chloride LiCl 1 0 RH Greenspan s uncertainty magnesium chloride MgCl2 1 0 RH Greenspan s uncertainty natrium chloride NaCl 1 4 RH Greenspan s uncertainty potassium sulphate K2SO4 1 5 RH Greenspan s uncertainty The uncertainty given in Greenspan s calibration table on page 25 at the calibration temperature for example...

Страница 38: ...______M210185EN C Response time probe and calibrator at the same temperature with Vaisala sensors typically 10 min deviation of the final value 1 RH Accuracy of the thermometer with mercury 0 3 C with red capillary liquid 1 C Dimensions 0 9 23 cm Materials metal parts anodised aluminium Weight 1 kg without salt solutions ...

Страница 39: ...www vaisala com M210185EN ...

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