Calibration procedure for M Series
Contents
1. As first step to achieve this the offset value must be set correctly This is usually done at 35 rh Output s s2 Ideal curve Before adjustment After adjustment Relative humidity 0 10 35 80 Adjustment points The offset is now adjusted the blue line goes through the 35 point As the line is not going trough zero and maximum the slope and linearity must be adjusted next The slope will be set at 80 This results in linearity between 30 and 100 Output Relative humidity 0 10 35 80 Adjustment points Kalibrierung Calibration_procedures_2 doc Next the linearity between 30 and 10 must be set Output Fix due to 80 adjustment Relative humidity 10 35 80 Adjustment points If measurement is required below 10 rh the 4 point should also be set Usually this is done at 0 0 5 rh Relative humidity 0 10 35 80 Adjustment points When all these adjustments are done the characteristic line is linear and the probe is perfectly adjusted Kalibrierung Calibration_procedures_2 doc D 3 2 Single point Adjustment If a one point adjustment only is performed the measured values are accurate around the selected point But as slope and linearity are not adjusted the ranges that are far away from the adjusted point are not very accurate Offset of the charachteristic Output Relative humidity 0 10 35 80 Adjustment points We therefore recommend to2. HW3 mi RS232 A point probe adjustment of a yes yes probe 1 probe 2 or both at the CADIE same time E or Multi point probe adjustment of 55 AC1622 yes yes probe 1 probe 2 or both at the B3 lt gt D9sub same time 1 point adjustment against reference probe ye yes In this function probe 2 is always the reference probe 2 2 HygroPalm connected to HygroFlex Service Cable Palm2 Palm 3 Possible Functions Display the readings from any probe connected to the HygroFlex Display the HygroFlex yes status configuration serial number etc Remote 1 point adjustment of any Cables HygroClip digital probe connected to the transmitter using the probe AC1 621 connected to the DAT5 lt gt B2 HygroPalm as a reference Access the functions except for calculate and AC 620 display of the transmitter B5 lt gt B2 primarily the adjust M PT function for multi point probe calibration Kalibrierung Calibration_procedures_2 doc 5 2 3 HygroPalm connected to M amp Roline L Series Service M1 M22 M23 M33 L 1x Possible Functions Cable Display the measurement values of yes yes yes yes any probe connected to the M2 M3 transmitter Display the status configuration serial no no yes no number RS status probe serial number firmware version etc 1 point adjustment of any digital probe respectively transmitter using the B My mainte 0 8 yes yas 123 probe connected to the H
3. but not the slope and neither the linearity This means that on the particular point the instrument will be accurate but the farther away from that point the bigger the deviation Within HW3 and also with HygroPalm handhelds you can always select the mode of adjustment 1 point or multiple point When you select one point you definitely move the offset and only the offset The offset is the parallel movement of the whole curve in vertical direction as shown in the left graph while the slope is the steepness of the curve as the graph to the right shows Offset Slope A fourth point may be adjusted in order to get perfect linearity Details see in subsequent pages Kalibrierung Calibration_procedures_2 doc 9 3 Theory on calibration 3 1 Multipoint adjustment An ideal characteristic line of a sensor would be absolutely straight Output 67 F 67 A real characteristic line of a humidity sensor curve is not straight but slightly bent Hence the aim must be to achieve a linearisation Output Relative humidity 0 10 35 80 Adjustment points The Hygromer sensor is by its nature linear between 30 and 100 rh Below 30 rh there is a kink in the curve which needs linearisation Therefore the adjustment point are set as follows 1 point Offset 35 rh 2 point Slope 80 rh 3 point Linearity between 30 and 10 rh 4 point Linearity between 10 and 0 rh Kalibrierung Calibration_procedures_2 doc 0
4. perform multiple point adjustments in order to achieve maximum accuracy Kalibrierung Calibration_procedures_2 doc 3
5. reference adjustment is finished Note If you use a calibration device EDM15 15 you can insert both probes at the same time to ensure identical conditions For detailed information see separate HygroPalm manual HygroPalm Function Menu Adjust Ref Note If you do not wish to adjust a probe but only to calibrate do not press enter Pressing the Menu key will bring you back 1 5 Probe adjustment with calibration device and Humidity Standard ROTRONIC provides easy to use certified humidity standards for those customers who do not have access to a humidity generator To use these standards you will need a calibration device that is suitable for your probe The calibration device is a small airtight container that fits on the probe and seals around the humidity sensor During calibration a known reference humidity is generated inside the calibration device by means of a humidity standard usually an aqueous salt solution When using calibration devices make sure the lid is screwed in from below in order to avoid spillage of the liquid Calibration devices for all transmitters and probes are available from ROTRONIC Please see your user manual to determine the appropriate type for your instrument Kalibrierung Calibration_procedures_2 doc 3 Certified Humidity Standards The ROTRONIC certified standards are available in boxes of 5 glass ampoules of the same value which can be stored indefinitely Standards in the range
6. en calibrating keep as much distance as possible Humidity faults Humidity errors due to sprayed steam or water dripping water attempts to measure non hygroscopic substances The reproducibility and long term stability are not influenced even if the sensor was exposed to high humidity or saturation with water vapour condensation 1 3 Periodic probe calibration The Pt 100 RTD temperature sensor as well as the electronics are very stable and normally do not have to be adjusted after the factory calibration The long term stability of the ROTRONIC Hygromer sensors is typically better than 1 rh per year For maximum accuracy we recommend to calibrate the probes once or twice a year In applications where the sensor is exposed to pollutants it may be necessary to calibrate or adjust more often The calibration may be performed by the user on site or in the laboratory workshop For routine calibrations the probe should be checked at one point preferably at the prevailing values For applications in the ambient this would normally be at 50 rh In industrial and pharmaceutical applications where the accuracy must be higher we recommend to calibrate the probes at 3 points in this sequence 35 80 10 rh If measurements are performed at very low humidity we recommend to calibrate adjust also at 0 0 5 rh Note The electronics of the Rotronic transmitters usually does not require any field maintenance However the probe itse
7. ieineea ENRE EErEE REUE EEE ERREA EEE ERSEN 10 IT MUPA AGW ae ee 10 3 2 Single point ACJUStMENL cc cccecccseeeceeeeeeeeeeeeeeeeeeeseeeeseeeeseeeeseeeeeseeesaeeeeas 13 1 Procedures 1 1 General recommendations Relative humidity is extremely dependent on temperature Proper measurement of relative humidity requires that the probe and its sensors are at exactly the temperature of the environment to be measured Because of this the location you choose to install the probe can have a significant effect on the performance of the instrument The following guidelines should guarantee good instrument performance a Select a representative location install the probe where humidity temperature and pressure conditions are equal to the environment to be measured b Provide good air movement at the probe air velocity of at least 1 meter second facilitates adaptation of the probe to changing temperature c Avoid the following Close proximity of the probe to a heating element a cooling coil a cold or hot wall direct exposure to sun rays etc Close proximity of the probe to a steam injector humidifier direct exposure to precipitation etc unstable pressure conditions resulting from excessive air turbulence 1 2 Sources of errors Measurement values may be affected by Temperature faults Too short adaptation time cold walls heating elements sun radiation etc Even the body radiation of man may affect the measurement Wh
8. lf should be calibrated at least once per year in order to maintain it s high quality For details of calibration see users manual full version It may be downloaded from the internet Kalibrierung Calibration_procedures_2 doc 2 1 4 Reference adjustment by HygroPalm 3 handheld instrument When using the new digital devices calibration adjustment by reference is done best with a HygroPalm 3 handheld instrument and an SCS certified reference probe For older types of transmitters different procedures are applicable For a one point adjustment against a reference probe connect the proper service cable to probe input 1 of the HygroPalm3 and to the service connector of the transmitter The 5 pin connecior is compatible with the HygroClip connector Use an adaptor cable such as MOK 02 B5 to connect the reference probe to probe input 2 of the HygroPalm 3 Details regarding the service cable device combination you will see in the tables on pages 5 to 7 Bring both probes next to each other Allow sufficient time to acclimate Be careful not to influence the measurement by body radiation humidity When the equilibrium is reached both arrows of the trend indicator visible you re ready for adjustment Press the Menu key then one of the arrow keys until the function ADJUST REF is displayed Now press ENTER The display shows REF PALM Press ENTER The display shows SURE Press enter to confirm and adjust Now the
9. n date of 7 temperature and humidity calibration Note HW3 will recognize the transmitters as a single HygroClip probe Do not attempt to adjust temperature unless you have very accurate reference instruments Kalibrierung Calibration_procedures_2 doc 7 2 M1S amp Roline LxS Series connected to PC via MOK WIN and ACRLXB5 Service cable Display the measurement values of the M1 L1x transmitter MOK 02 WIN RHS humidity standard HW3 software a RHS humidity standard MOK 02 WIN Yes Yes 1 point or 2 point adjustment eventually of temperature AC adaptor AC1207 Display the serial number last Ved Vee calibration date of o temperature and humidity calibration Note HW3 will recognize the transmitters as a single HygroClip probe Do not attempt to adjust temperature unless you have very accurate reference instruments Note The shaded functions can be performed with the distributor version of HW3 only Kalibrierung Calibration_procedures_2 doc 8 2 8 Frequently asked questions Question am using at present a ACRLO10 on a HygroPalm 3 input 1 plug into the M series Input 2 is connected to a MOK 02 B5 with my reference HygroClip read the unit and compare the value with the value of the HygroClip on input 2 go then to adjust the M22 series go to adjust REF Palm displays Palm Reference and press OK and adjust my M series Is this OK or do I risk errors on the ACRL 010 The i
10. nput 1 of the HygroPalm is configured for a digital probe Answer The HygroClip probes connected on any of the M series transmitters can be adjusted that way It must be pointed out that only the HygroClip probes but not the output signals can be adjusted that way Of course the output signal will be changed also according to the adjustment deviation of the probe Question When I do a multi point adjust do e g 35 as first point and come out of the menu and change my solution to e g 80 I then await stabilization and go back into the adjust menu and do my 80 How does the clip know that its not a 1 point adjust at 80 instead of a second point at 80 The fact that I began at 35 does it memorize or does this set something off Answer The determination is done in the adjustment window of HW3 There you select either a single or multi point adjustment If a multipoint adjustment is done the software will check for the entered values If a value between 25 and 55 rh is entered the algorithm will consider this as the offset point A value gt 55 is considered as slope value while a value gt 1 gt 25 is used for linearity adjustment in the low range Question When I do a 1 point adjustment is the adjusted probe only correct for the point done and false for the rest of the curve When I do one point do I not just displace the whole slope up or down Answer A one point adjustment always just influences the offset
11. of 5 to 95 RH are non saturated aqueous salt solutions that are precisely titrated at our factory for the right concentration The 0 RH humidity standard is made of small granules of a highly porous ceramic that have been dried at a high temperature A Material Safety Data Sheet is available for each standard Since most standards are a salt solution parts which have come in contact with the liquid should be cleaned after each use Each box of standards comes with a certificate that provides statistical information on the manufacturing batch of the standard Information on the effect of temperature on each standard is provided on the cover of each box of standard When calibrating either with the HygroPalm or with the HW3 software the effect of temperature on the standards is compensated by the software and no further correction is required The value of the standards is not affected by altitude Instructions for using the Standards e Install the calibration device on the probe so that the receptacle or solution holder is under the probe Check for a tight fit and remove the receptacle from the calibration device e Place one fibre disc each box of standards includes 5 discs in the receptacle of the calibration device The purpose of this disc is to prevent accidental spilling of the solution inside the calibration device or on the humidity sensor e Tap the top of the ampoule so that all liquid drops to the bottom of the ampoule Snap off t
12. op and empty contents on fibre disc Since the ampoule is made of glass exercise proper caution gloves safety glasses when snapping off the top e Put the receptacle back on the calibration device and make sure that the solution does not come in contact with the sensor The solution inside the calibration device should never be on top of the sensors e Allow at least 60 minutes to insure that the calibration device the solution and the sensor are in a state of equilibrium This is verified by monitoring the display e After adjusting the probe remove the receptacle from the calibration device Throw away the wet disc non reusable Thoroughly wash and wipe dry the receptacle General Recommendations During calibration temperature stability is the single most important requirement If possible calibrate the probe at room temperature 18 to 25 C Room temperature should be stable to 0 25 C or better during the period of time required for each calibration point Do not calibrate close to an air vent or a heater in direct exposure to sun rays etc lf using a humidity generator to calibrate the probe make sure that the probe is as fully immersed in the generator as possible to minimize temperature effects Kalibrierung Calibration_procedures_2 doc 4 2 Cable Overview 2 1 HygroPalm connected to PC Service Cable Palm 2 Palm 3 Possible Functions Communication by RS232 between Palm and PC Configuration of Palm with
13. ro tronic LEADING IN HUMIDITY MEASUREMENT Calibration Procedure for ROTRONIC Digital Products and Service Cable Overview Contents te POCOO ee ee eee eee ee eee 2 1 1 General recOoOMMENCALIONS ccccceeccceeeeceeeeceecesaeeeseueesauceceueessueesueesneeseess 2 Te SOWECSS Ol SI Ol S arrccacuswassncacnceascacadeanassaceatanannesaaact uss vssdeus seen EEEE OEE EEN 2 1 3 Periodic probe calibration ccccccccccseccceeeeeeeeeeeeeecseeesaeeeseueeseueeseueeseueeseeeseees 2 1 4 Reference adjustment by HygroPalm 3 handheld instrument 068 3 1 5 Probe adjustment with calibration device and Humidity Standard 0 3 Bx SGADIS OVVIO erare rarae E E REEE EAEE E EEEE EEE EAE EAE EEEE 5 A AAV ONO IRIN COTM To PO oe EEE 5 22 MAYOrOr ali CONMeECICG to Hyro Flex rsss aaar enS Eni 5 2 3 HygroPalm connected to M amp Roline L Series cc cecccceeeeecseeeeseeeeeseeeeeeaees 6 2 4 M23 M33 connected directly to PC n nennnennsnennnsnnesnnnnsnnnsnrsnrrrnsrrrsrresereerneee 6 2 5 M 1 Series amp Roline L connected to PC via HygroPalm cccccesseeeeeeeeeeeees 7 2 6 M1 amp Roline L Series connected to PC via MOK WIN and ACRLXBB 7 2 7 MI1S amp Roline LxS Series connected to PC via MOK WIN and ACRLXBB 8 2 8 Frequently asked QUESTIONS ccccccecceseeeeseeeeceeeeseeeeseueeseeeseuseseueeseeeeseeeesaaees 9 Se LIC OMY on Calaoise ia
14. ygroPalm probe 2 connector as a reference 1 point adjustment of any digital probe yes respectively transmitter using a RHS humidity standard Multi point adjustment of any digital yes probe respectively transmitter using a RHS humidity standard Set trend indicator and units of the transmitter Probe adjustment and output validation ACRLYB5 Works only in conjunction with ACRLOO1 ACRL420 2 4 M23 M33 connected directly to PC Functions required Configuration of transmitter Service cable Scaling of output signals ACML232 1 point adjustment UNO Multi point adjustment Kalibrierung Calibration_procedures_2 doc 6 2 5 M1 Series amp Roline L connected to PC via HygroPalm Dovie myp MIS Lix unction M1xD Functions required Scaling of output signals PC HW3 Service cable yes Vee Wee Adjustment of digital analog software ACRLOO1 converter HygroPalm ACRLO05 Service cable compensation AC1622 or ACRLO10 Simulation of analogue outputs Docking Station ACRLO20 Note ACRL420 Use the appropriate cable according to the output signal of the transmitter that is to be adjusted 2 6 M1 amp Roline L Series connected to PC via MOK WIN and ACRLXB5 Service cable Display the measurement Yes Yes values of the M1 L1x transmitter MOK 02 WIN RHS humidity standard HW3 software a RHS humidity standard MOK 02 WIN of temperature AC adaptor AC1207 Display the serial number last Vee Yes calibratio
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