User's Guide _______________________________________________________________________
66 ___________________________________________________________________ M211399EN-G
The adjustment of temperature measurement is always a simple 1-point
offset correction.
The 1-point humidity adjustment of the HMW90 series adjusts both
offset and gain, depending on the adjustment condition. In a dry
condition (for example, 11 %RH), offset is adjusted more than gain.
NOTE
The 1-point humidity adjustment requires that the target condition is at
least 50% of the currently measured value. This prevents the user from
making excessive corrections that are very unlikely to be needed.
However, if you feel that you may have done an incorrect adjustment,
you can easily remove the adjustment using the HM70 or the
CRH RESET
command on the serial line.
NOTE
Only T adjustment is available on the TMW92 and TMW93 transmitters.
Adjustment Using Display and Trimmers
CAUTION
The trimmers only turn 135 degrees each way, less than half a rotation.
Do not force the trimmer past the stopping point. If you wish to apply a
greater correction than allowed by the trimmer in a single adjustment,
simply adjust the transmitter again. Corrections applied using the
trimmers are cumulative.
NOTE
User calibration settings (adjustment by trimmers or service port) are
stored in the HTM10 module. If you replace the module, there is no need
to undo previous adjustments.
1.
To enter the adjustment screen, open the slide and rotate the
RH or T trimmer slightly during normal measurement. If the
trimmer is not centered, you see the trimmer centering screen first.
Simply turn the trimmer to the center and wait for the progress bar
to complete.
1111-075
Figure 32
Trimmer Centering Screen
