TRANMITTER QUALITY VERIFYING. HygroDat 20 M TR 200 I-2002 HygroClip HMP 233. Humidity- and Temperature Measurement System for process control

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1 TRANMITTER QUALITY VERIFYING HygroDat 20 M TR 200 I-2002 HygroClip HMP 233 Humidity- and Temperature Measurement System for process control Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 1

2 TRANMITTER QUALITY VERIFYING ( YEAR 2000 ) 1 General description Transmitters which have been tested Test equipment and installation Setting of the temperature chamber Setting of the writing recorder 3701 LR Signal terminal Setting Installation and configurations of the program HygroWin Measuring cycles Measuring of accuracy (A) Measuring of velocity and hysteresis (B) Measuring results Average deviation of accuracy of temperature measuring Average of the hysteresis of humidity measuring Average of velocity of humidity measuring (to τ 99 ) Installation, start up and calibration Summary Diagrams... 9!! THIS IS AN COMPANY INTERNAL MEASUREMENT REPORT OF NOVASINA!! Novasina Year 2000 / ROB Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 2

3 1 General description In order to find out the quality of the Novasina transmitters especially compared to the competitors, we have built up an extensive measuring installation. We have tested the accuracy, velocity and hysteresis of the humidity and temperature sensors. The test run was held in the February Transmitters which have been tested The following three competitor and two Novasina transmitters have been tested: Hygrodat 20M Novasina TR Novasina I S1X20CW4C2D Rotronic Hygroclip Rotronic HMP233 A2C2A2AA12A1A3C T Vaisala 2 Test equipment and installation The sensors were placed in a very stable temperature chamber (Weiss Technik AG, SB22/160/80). This chamber are able to hold the predefined temperature in an accuracy of ±0.2 C. In order to monitor the temperature, we installed additionally a high precision temperature measuring system (Temp.master 100) with an accuracy of ±0.05 C (see Certificate of Calibration). The reference humidity sources were made by Novasina Sensor-Checks SC. Each sensor was plugged into the same type of Sensor-Check SC. Each connection of sensor and Sensor- Check was correctly sealed. The Sensor-Checks have always been tempered to the next temperature level in the chamber for 1 hour. The following Sensor-Checks have been used: SC-11 (11.3%RH at 25 C) SC-33 (32.8%RH at 25 C) SC-53 (52.9%RH at 25 C) SC7-5 (75.3%RH at 25 C) SC-90 (90.1%RH at 25 C) SC-98 (98.0% RH at 25 C) SC-100 (100.0%RH at 25 C) The test was running at the following temperature levels: -15 C, 10 C, 25 C, 40 C and 65 C 2.1 Setting of the temperature chamber The temperature chamber was operated in the manual mode. The operating range of the chamber was limited from 90 C to 90 C. 2.2 Setting of the writing recorder 3701 LR Signal terminal The signal output of all test transmitters were connected to the terminals H (+) and L (-) except the Hygroclip, which was connected directly to a Personal Computer. The Hygromer I-2002 has a temperature- and humidity output signal in a range of 4 to 20 ma, so it was necessary to convert them to a signal of 2 to 10 VDC with a 500Ω precision resistor. All other output signals were in a range of 0 to 10 VDC. Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 3

4 2.2.2 Setting The following settings have been made: No Device Hygrodat M20 TR200 I-2002 HMP 233 Manufacturer Novasina Novasina Rotronic Vaisala T-cannel H-cannel T-pen orange blue black red H-pen green brown violet lilac RANGE 10V 10V 10V 10V 20V 20V 10V 10V SPAN L a 0.000V a 0.000V a V a 0.000V SPAN R b V b V b V b V SCALE L c 0.00%RH c 0.00%RH c 0.00%RH c 0.00%RH SCALE R d % RH d % RH d % RH d % RH UNIT C %RH C %RH C %RH C %RH FILTER OFF OFF OFF OFF OFF OFF OFF OFF a 4.000V 2.500V 5.500V 8.000V 0.000V b 5.000V 3.500V 6.500V 9.000V 1.000V a V 4.800V 7.200V 9.200V 3.600V b V 5.600V 8.000V V 2.800V c 20 C 5 C 35 C 60 C -20 C d 30 C 15 C 45 C 70 C -10 C The paper feed was set to 100 mm/h. 2.3 Installation and configurations of the program HygroWin2 The program HygroWin2 Version 1.11 has been installed and the following configurations have been made: Interval: 30 s The stored files were named as followed: me_a_25.txt measuring of accuracy (A) at 25 C me_a_10.txt measuring of accuracy (A) at 10 C me_a_40.txt measuring of accuracy (A) at 40 C me_a_65.txt measuring of accuracy (A) at 65 C me_a_-15.txt measuring of accuracy (A) at -15 C me_b_25.txt measuring of velocity and hysteresis (B) at 25 C me_b_10.txt measuring of velocity and hysteresis (B) at 10 C me_b_65.txt measuring of velocity and hysteresis (B) at 65 C Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 4

5 3 Measuring cycles In order to carry out the test in a very realistic manner, we have measured in two steps. Firstly we wanted to know the accuracy of each device on eight humidity measuring-points during two hours and on five temperature levels. Secondly we have checked the velocity and hysteresis of each sensor on three temperature levels Measuring of accuracy (A) We have verified the humidity measuring results on eight measuring-points (see below) during two hours each and on the following five temperature levels: 25 C, 10 C, 40 C 65 C and 15 C 100%RH 90%RH 80%RH 70%RH Humidity 60%RH 50%RH 40%RH 30%RH 20%RH 10%RH 0%RH Humidity measuring-points: 11%RH, 33%RH, 53%RH, 75%RH, 90%RH, 100%RH, 11%RH and 98%RH Measuring of velocity and hysteresis (B) The verification of the velocity and hysteresis has been made at five humidity measuring-points (see below) during two hours each and at the following temperature levels: 25 C, 10 C and 65 C 100%RH 90%RH 80%RH 70%RH Humidity 60%RH 50%RH 40%RH 30%RH 20%RH 10%RH 0%RH Humidity measuring-points: 53%RH, 98%RH, 53%RH, 11%RH, 53%H, 75%RH, 53%RH, 33%RH and 53%RH Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 5

6 3.2 Measuring results The evaluation of the measuring results are divided in to four groups. The first group shows the accuracy deviation of the humidity on different levels. The second group shows the temperature accuracy. The third group shows the hysteresis on the measuring point of 53% RH, one hour after a substantial humidity change at different temperature levels. And the fourth group shows the time between start of increase or decrease and reaching of the level 1% (τ 99 ) before stable level of humidity. All deviations in this verifying are absolute values. Humidity accuracy at 25 C 11.3% RH 32.8% RH 52.9% RH 75.3% RH 90.1% RH 100% RH 11.3% RH 98% RH Total Hygrodat 20M 0,09 0,04 0,26 0,32 0,35 0,41 0,45 0,66 0,32 TR200 0,02 0,30 0,03 0,20 3,27 0,99 0,67 1,07 0,82 I ,15 0,08 0,16 0,20 0,45 1,02 0,01 0,33 0,30 Hygroclip 0,34 0,48 0,24 0,44 0,96 1,95 0,68 1,42 0,81 HMP233 0,53 1,25 1,06 1,16 1,97 3,83 0,17 2,63 1,57 Humidity accuracy at 10 C 11.3% RH 32.8% RH 52.9% RH 75.3% RH 90.1% RH 100% RH 11.3% RH 98% RH Total Hygrodat 20M 0,16 0,61 0,22 0,68 0,95 0,05 0,32 0,67 0,46 TR200 1,48 2,12 1,05 1,17 4,85 0,00 0,52 1,00 1,52 I ,41 0,32 0,40 0,30 0,77 1,17 0,21 0,57 0,77 Hygroclip 0,14 0,68 0,82 0,98 2,42 2,70 0,84 2,96 1,44 HMP233 1,25 0,99 0,80 0,91 2,34 3,60 1,61 3,62 1,89 Humidity accuracy at 40 C 11.3% RH 32.8% RH 52.9% RH 75.3% RH 90.1% RH 100% RH 11.3% RH 98% RH Total Hygrodat 20M 0,39 0,26 0,25 0,20 0,54 0,07 0,23 1,65 0,45 TR200 1,85 2,26 2,42 1,21 3,86 1,40 1,59 1,83 2,06 I ,48 0,28 0,22 0,59 0,49 1,32 0,48 0,52 0,55 Hygroclip 0,74 0,34 0,10 0,02 0,02 1,04 1,34 0,24 0,48 HMP233 0,68 1,90 2,18 2,51 2,47 3,94 0,48 2,72 2,11 Humidity accuracy at 65 C 11.3% RH 32.8% RH 52.9% RH 75.3% RH 90.1% RH 100% RH 11.3% RH 98% RH Total Hygrodat 20M 0,23 1,88 3,52 1,36 2,19 0,25 0,21 3,03 1,58 TR200 4,56 7,26 7,12 4,14 8,42 1,07 5,65 8,53 5,84 I ,65 0,58 3,43 0,44 0,10 2,60 1,83 3,20 1,73 Hygroclip 1,72 2,34 2,60 2,10 2,56 0,00 1,60 3,80 2,09 HMP233 0,96 2,41 11,87 2,77 2,33 5,37 1,18 0,03 3,37 Humidity accuracy at -15 C 11.3% RH 32.8% RH 52.9% RH 75.3% RH 90.1% RH 100% RH 11.3% RH 98% RH Total Hygrodat 20M 4,83 0,50 0,58 5,97 8,79 9,41 4,71 7,17 5,24 TR200 2,04 3,56 1,47 12,30 0,14 2,83 19,00 1,10 5,30 I ,73 0,18 0,94 0,05 11,65 15,48 6,14 11,96 6,52 Hygroclip 6,32 0,98 0,40 0,36 11,58 14,38 9,52 11,56 6,89 HMP233 4,71 1,84 2,19 1,37 12,78 18,09 4,82 16,76 7,82 The humidity measuring results show the Novasina Hygrodat as the most accurate transmitter over the whole measuring range, followed by the Rotronic I-2002 and Hygroclip. The Novasina TR200 and the Vaisala HMP233 are definitely at the end of the ranking. Hygrodat M20 1,611 TR200 3,109 I ,973 Hygroclip 2,343 HMP233 3, Average deviation of accuracy of temperature measuring -15 C 10 C 25 C 40 C 65 C Total Hygrodat 20M 0,074 0,168 0,205 0,269 0,403 0,280 TR200 0,130 0,179 0,204 0,264 0,214 0,248 I ,249 0,302 0,184 0,220 0,186 0,285 Hygroclip 0,313 0,177 0,148 0,081 0,089 0,202 HMP233 0,225 0,114 0,081 0,111 0,178 0,177 Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 6

7 The temperature measurings show another result. The leader here is the Vaisala HMP233, followed by the Rotronic Hygroclip and Novasina TR200. At the end you can find here the Novasina Hygrodat and the Rotronic I Average of the hysteresis of humidity measuring Temperature Set value Hygrodat 20M Novasina TR200 Rotronic I-2002 Rotronic Hygroclip Vaisala HMP233 %RH actual actual actual actual actual 52,90 52,77 53,97 54,23 54,30 52,25 98,00 52,90 52,80 53,53 54,56 54,80 52,90 difference 0,03 0,44 0,33 0,50 0,65 52,90 52,80 53,53 54,56 54,80 52,90 11,30 52,90 52,69 53,50 54,16 54,20 52,21 difference 0,11 0,03 0,40 0,60 0,69 52,90 52,72 53,75 54,02 52,22 75,00 52,90 difference 52,90 32,80 52,90 52,72 53,81 54,05 52,10 difference 0,00 0,06 0,03 0,00 0,12 25 C Temperature Set value Hygrodat 20M Novasina TR200 Rotronic I-2002 Rotronic Hygroclip Vaisala HMP233 %RH actual actual actual actual actual 52,90 58,20 58,30 58,70 57,80 56,70 98,00 52,90 58,22 57,95 59,02 58,50 57,71 difference 0,02 0,35 0,32 0,70 1,01 52,90 58,22 57,95 59,02 57,71 11,30 52,90 57,86 57,35 58,56 56,74 difference 0,36 0,60 0,46 0,00 0,97 52,90 57,95 57,87 58,46 56,74 75,00 52,90 57,95 57,95 58,55 57,01 difference 0,00 0,08 0,09 0,00 0,27 52,90 57,95 57,95 58,55 58,10 57,01 32,80 52,90 57,89 57,72 58,46 57,80 56,60 difference 0,06 0,23 0,09 0,30 0,41 10 C Temperature Set value Hygrodat 20M Novasina TR200 Rotronic I-2002 Rotronic Hygroclip Vaisala HMP233 %RH actual actual actual actual actual 52,90 42,98 50,10 38,92 42,20 37,11 98,00 52,90 42,45 47,16 41,90 43,80 36,71 difference 0,53 2,94 2,98 1,60 0,40 52,90 42,45 47,16 41,90 43,80 36,71 11,30 52,90 44,50 48,25 37,98 41,10 37,01 difference 2,05 1,09 3,92 2,70 0,30 52,90 44,62 48,35 37,45 36,39 75,00 52,90 44,60 48,16 37,42 35,23 difference 0,02 0,19 0,03 0,00 1,16 52,90 44,60 48,16 37,42 35,23 32,80 52,90 44,67 47,67 37,15 35,29 difference 0,07 0,49 0,27 0,00 0,06 65 C Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 7

8 average difference Hygrodat 20M 0,295 Novasina TR200 0,591 Rotronic I ,811 Rotronic Hygroclip (only 6 measurings) 1,067 Vaisala HMP233 0,549 measure The best Transmitter concerning the hysteresis is the Novasina Hygrodat again, followed by the Vaisala HMP233. This refutes the thesis a capacitive cell has generally a big hysteresis Average of velocity of humidity measuring (to τ 99 ) actual Temp. Humidity Hygrodat 20M Novasina TR200 Rotronic I-2002 Rotronic Hygroclip Vaisala HMP233 jump time (min) time (min) time (min) time (min) time (min) 25 C 10 C 65 C 52,90 98,00 20,70 12,60 12,30 14,03 28,20 52,90 5,40 10,20 2,40 6,00 19,20 11,30 2,40 9,60 1,80 5,00 8,40 52,90 1,50 6,60 0,30 5,50 6,60 75,00 2,10 6,60 0,90 6,70 32,80 2,40 9,00 0,18 7,80 52,90 1,20 2,10 0,18 4,20 52,90 98,00 12,00 3,60 18,60 0,30 52,90 13,20 33,00 22,80 34,80 11,30 3,60 12,00 2,40 22,20 52,90 2,40 15,00 1,20 9,00 75,00 3,00 16,20 7,20 7,80 52,90 6,60 7,50 0,30 2,40 5,40 32,80 3,30 7,20 1,80 5,10 4,20 52,90 1,80 7,50 0,90 1,30 7,80 52,90 98,00 8,40 15,00 16,20 4,10 14,40 52,90 0,60 0,60 0,30 0,60 9,00 11,30 6,00 22,20 10,20 7,30 6,00 52,90 4,20 6,00 0,10 2,90 1,50 75,00 4,80 6,60 3,60 17,40 52,90 3,00 1,80 0,00 5,40 32,80 1,80 3,00 1,20 2,10 52,90 3,00 0,90 0,00 1,20 average (min) Hygrodat 20M 4,93 Novasina TR200 9,34 Rotronic I ,56 Rotronic Hygroclip (only 11 measur.) 4,93 Vaisala HMP233 9,98 In the measuring velocity, the Rotronic I-2002 are at the top, followed by the Hygroclip and Novasina Hygrodat. The Vaisala HMP233 are dropped back again. Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 8

9 4 Installation, start up and calibration In order to connect the electrical wiring you have to open all transmitter housings, except the Hygroclip. At the Rotronic I-2002 you have to remove the front plate additional in order to reach the terminal block. If you have to disconnect the sensor from the controller for any reason, at the Vaisala HMP233 you need a soldering iron. All other devices have a plug connection for the sensor. For the fixation of the controller and sensors you can get the corresponding components from all suppliers. The Novasina Hygrodat is equipped with a very user-friendly 5 point calibration system. A similar calibration system is available for the Vaisala HMP233, but only with 2 calibration points. The Rotronic I-2002 has to become calibrated with 4 potentiometers, which is very complicated. The Hygroclip are not equipped with a user calibration system. 5 Summary With this method of measurement it is impossible to make an absolute statement concerning the measurement accuracy, the measurement velocity and the hysteresis of these transmitters. The cause are the measurement-, reading- and installation faults, especially on the temperature levels of 15 C and 65 C and also that we have tested only one equipment each. But you can recognise tendencies of the quality of the individual transmitters. These measurings show the Hygrodat as the most accurate device concerning humidity measuring. But we have to improve the accuracy of the temperature measuring. 6 Diagrams Humidity accuracy at 25 C 11.3% RH 32.8% RH 52.9% RH 75.3% RH 90.1% RH 100% RH 11.3% RH 98% RH average deviation (%RH) 4,5 4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5 0,0 Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 9

10 Humidity accuracy at 10 C average deviation (%RH) 6,0 5,0 4,0 3,0 2,0 1,0 0,0 Humidity accuracy at 40 C average deviation (%RH) 4,5 4,0 3,5 3,0 2,5 2,0 1,5 1,0 0,5 0,0 Humidity accuracy at 65 C average deviation (%RH) 14,0 12,0 10,0 8,0 6,0 4,0 2,0 0,0 Humidity accuracy at -15 C average deviation (%RH) 20,0 18,0 16,0 14,0 12,0 10,0 8,0 6,0 4,0 2,0 0,0 Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 10

11 Temperature accuracy -15 C 10 C 25 C 40 C 65 C average deviation ( C) 0,45 0,40 0,35 0,30 0,25 0,20 0,15 0,10 0,05 0,00 Hysteresis 1,20 1,00 humidity (%RH) 0,80 0,60 0,40 0,20 0,00 Hygrodat 20M Novasina TR200 Rotronic I Rotronic Hygroclip Vaisala HMP233 Measuring velocity 12,00 10,00 time (min.) 8,00 6,00 4,00 2,00 0,00 Hygrodat 20M Novasina TR200 Rotronic I Rotronic Hygroclip Vaisala HMP233 Enclosure: - Certificate of Calibration Novasina, a division of Axair Ltd., Talstrasse 35 37, 8808 Pfäffikon, Switzerland 11

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