Vaisala HMM213 - Manual (Page 36)

USER'S GUIDE____________________________________________________________________
Calibration Table
Table 6 Greenspan's Calibration Table with Output Values
According to the Chosen Scale
Temperature °C
°F
15
59 20
68 25
77 30
86 35
95
LiCl %RH *) 11.3 11.3 11.3 11.3
NaCl %RH 75.6 75.5 75.3 75.1 74.9
*) If the LiCl solution is used or stored in temperatures below +18 °C (+64 °F), the equilibrium
humidity of the salt solution may change permanently.
Temperature Calibration
NOTE The temperature channel of the HMM213 is very stable and the modules
have been calibrated at the factory. Unless there is a strong reason to
believe that the adjustments have changed, do not perform a temperature
calibration. This is a very demanding procedure and requires both
expertise and extremely accurate references. Furthermore, it is important
to allow enough time for the stabilization during calibration.
If for some reason it is necessary to perform the temperature calibration,
follow attentively the instructions given below. Use an accurate and
calibrated reference only.
CT Temperature Calibration of the
Warmed Humidity Sensor Head
Two Point Calibration
CT
Using this command the transmitters can be calibrated against an
accurate reference, such as a Pt 100 simulator. A two-point calibration is
performed as follows:
>CT
T : 23.22 Ref1 ?
23.3
Press any key when ready ...
T : 101.42
Ref2 ? 101
36 ____________________________________________________________________ U339EN-1.3