CHAPTER 6______________________________________________ CALIBRATION AND ADJUSTMENT
VAISALA _________________________________________________________________________ 59
Humidity calibration table
TABLE 6-1 Greenspan's 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 5.81 5.81 5.81 5.81
0...20 mA 2.26 2.26 2.26 2.26
0...1 V 0.113 0.113 0.113 0.113
0...5 V 0.565 0.565 0.565 0.565
0...10 V 1.13 1.13 1.13 1.13
NaCl %RH 75.6 75.5 75.3 75.1 74.9
4...20 mA 16.10 16.08 16.05 16.02 15.98
0...20 mA 15.12 15.10 15.06 15.02 14.98
0...1 V 0.756 0.755 0.753 0.751 0.749
0...5 V 3.780 3.775 3.765 3.755 3.745
0...10 V 7.56 7.55 7.53 7.51 7.49
*) If the LiCl solution is used or stored in temperature below +18 °C (+64 °F), the
equilibrium humidity of the salt solution changes permanently.
Temperature calibration
The temperature channel has been calibrated at the factory and since it
is very stable, adjustment should be made only when there is strong
reason to believe that the adjustments have changed.
Temperature calibration should be performed against some accurate
temperature reference. It can be done either using the press switches
inside the housing, through the serial bus or the menus on the local
display. Either a one point offset correction or a two point calibration
is possible.
One point offset correction
Using serial commands
• Leave the reference instrument and the transmitter for at least 4
hours in the same space so that their temperatures have time to
equalize. Remove the filter cap prior to calibration.
Disconnect the security lock jumper
before turning the transmitter on!
To Next Page
Loading...
