User's Guide _______________________________________________________________________
58 ___________________________________________________________________ M211060EN-H
Calibration Procedure
To calibrate your probe, you need a known stable humidity or
temperature reference, and a way to read the output of the probe (analog
output, serial output, or the MI70 indicator). As a humidity reference
you can use, for example, the Vaisala Humidity Calibrator HMK15.
NOTE
The probe cannot be used with the MI70 hand-held indicator when the
probe is in analog mode. To use the probe with MI70, enable the serial
mode as instructed in Accessing Serial Line Command Interface (RS-
485 Mode) from Analog or Modbus Mode on page 36. To return to
analog mode, use the
smode analog
serial line command (see Set Serial
Refer to chapter Technical Data on page 69 for accuracy specifications of
the probes.
1.
Connect the power/signal cable or MI70 connection cable to the
probe, but do not power it up yet.
2.
Remove the filter from the probe and place the probe in the
reference environment. For example, you can use a NaCl salt
chamber (75 %RH) as the humidity reference.
3.
Wait for 20 – 40 minutes for the reading to stabilize.
4.
Power up the probe and wait for one minute.
5.
Check the measurement reading, and compare it with the reading
that the reference should produce.
Adjustment Procedure Using Serial Line
(HMP110 and HMP113)
NOTE
If you are adjusting a probe that is in the analog output mode, see section
Accessing Serial Line Command Interface (RS-485 Mode) from Analog
or Modbus Mode on page 36 for instructions on how to start the probe in
RS-485 mode.
One-Point Adjustment of RH
Measurement (HMP110 and HMP113)
To perform a one-point adjustment to the capacitance measurement of
the HMP110 or HMP113 using serial line, you need:
- The Vaisala USB cable (Vaisala order code: 219690)
