Vaisala HUMICAP HMP140A Podręcznik Użytkownika Pobierz pdf (Strona 15)

HMP140A SERIES

U175en-1.5 Operating Manual

1999-12-08 11

4.4 Calibration table

Temperature °C 15 20 25 30 35

°F 59 68 77 86 95

LiCl %RH *) 11.3 11.3 11.3 11.3

4...20 mA mA 5.81 5.81 5.81 5.81

0...20 mA mA 2.26 2.26 2.26 2.26

0...1 V V 0.113 0.113 0.113 0.113

0...5 V V 0.565 0.565 0.565 0.565

0...10 V V 1.13 1.13 1.13 1.13

NaCl %RH 75.6 75.5 75.3 75.1 74.9

4...20 mA 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...1 V V 0.756 0.755 0.753 0.751 0.749

0...5 V V 3.780 3.775 3.765 3.755 3.745

0...10 V V 7.56 7.55 7.53 7.51 7.49

*) LiCl solution must not be used or stored in temperatures below +18 °C (+64 °F);

otherwise the equilibrium humidity of the salt solution changes permanently

Table 1 Greenspan’s calibration table with output values according to

the chosen scale

5. MAINTENANCE

5.1 Replacing the HUMICAP



180 sensor and the filter

Remove the damaged sensor and insert a new one. Handle the sensor by the

plastic socket. DO NOT TOUCH THE SENSOR PLATE. Check the output

after sensor change. If it deviates too much from the reference value,

recalibrate the transmitter. Note that even after sensor change, the accuracy is

still +7 %RH.

Replace a dirty filter to ensure a maximum lifetime for the sensor. Do not try

to clean the filter. The sensor can be cleaned with distilled water; if this does

not help, replace the sensor. Do not use any mechanical methods.

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