Vaisala HMD70U Manual do Utilizador descarregar pdf (Página 13)

HMD70U/Y Transmitters

U303en-1.1 Operating Manual

1997-07-31 9

4.3 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. Recalibrate the

transmitter.

Replace a dirty filter (membrane or sintered) to ensure a maximum lifetime

and a fast response for the sensor. Do not try to clean the filter.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18

Sem comentários

Vaisala HMD70U Manual do Utilizador Página 13