Vaisala HMP110REF User Manual

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 49
Clear Adjustment of RH Measurement
Use the CRHCLR command to clear the adjustment of RH measurement
that has been done using the CRH command. This command is not
available on the HMP110T.
CRHCLR<cr>
Example:
crhclr
OK
Calibrate Temperature Measurement
Use the CT command to perform a one-point or two-point temperature
(T) calibration. One-point calibration adjusts the offset for the
measurement, two-point calibration adjusts offset and gain.
CT [reference]<cr>
When performing a one-point calibration, you need to place the probe in
a single temperature reference and wait for 20 – 40 minutes for the
temperature to stabilize. To apply the adjustment, enter the CT command
with the reference temperature as a parameter.
Example: one-point calibration
ct 23.5
OK
Giving the command without parameters starts the two-point calibration.
Remember to allow the temperature to stabilize for 20 - 40 minutes after
changing the reference. The first reference point must be smaller than the
second point, and the difference between the reference points must be
more than 30 ºC. To update the measured value while the command is
running, press enter without inputting a value.
Example: two-point calibration
ct
T : 22.03 Ref1 ? 22
Press any key when ready ...
T : 55.12 Ref2 ? 55
OK

Vaisala HMP110REF Specifications

General

Measurement Parameters	Relative Humidity, Temperature
Humidity Measurement Range	0 to 100 %RH
Temperature Measurement Range	-40 to +80 °C
Operating Temperature Range	-40 to +80 °C
Storage Temperature Range	-40 to +80 °C
Protection Class	IP65
Humidity Accuracy	±1.5 %RH (0...90 %RH)
Temperature Accuracy	±0.2 °C at 20 °C
Response Time	15 seconds (63% step change)
Cable Length	2 m
Output Signal	Voltage 0 ... 1 V
Supply Voltage	5 ... 28 VDC
Material	PC