Vaisala Calibration of Digital Transmitters with HMI41 - Manual (Page 17)

Chapter 3 _______________________________________________________________ Calibration
VAISALA _______________________________________________________________________ 15
One-Point Offset and Gain
Calibrations
Select the desired calibration with buttons ▲ and ▼. Select offset
calibration if the humidity is < 65%RH and gain calibration if the
humidity is > 65%RH:
RH
or
RH
Press ENTER to acknowledge the selection. A text similar to the
following appears on the display:
RH %
In following chapters, you will find instructions for performing offset
and gain calibrations in two different ways.
HMI41 as a Reference Meter
The HMI41 reference probe is used to show the correct humidity
value. Connect the cable and wait for the transmitter and reference
probe readings to stabilize; when both readings are stable, press
ENTER to conclude the calibration. When ENTER is pressed, the
transmitter reading is corrected to the HMI41 reference probe reading.
RH %
Numbers on the first line indicate the RH measured by the transmitter,
and numbers on the second line indicate the RH measured by the
reference probe. Let the readings stabilize.