Low end adjustment – Vaisala MMT310 User Manual

Page 57

Chapter 6 ____________________________________________________ Calibration and adjustment

VAISALA ________________________________________________________________________ 57

Low End Adjustment

Remove the transmitter unit from the mounting plate (see page 18),

and press the adjustment button once (see Figure 15 on page 56).

Remove the filter from the probe and insert the probe head into a

measurement hole of the dry end reference chamber (for example

LiCl: 11 % RH in the humidity calibrator HMK15, use the adapter

fitting (13.5 mm)).

Wait at least 30 minutes for the sensor to stabilize.

Issue the CRH command and press ENTER.

Type C and press ENTER a few times to check if the reading is

stabilized.

5. When the reading is stabilized, give the reference humidity after

the question mark and press ENTER.

>crh

RH : 11.25 Ref1 ? c

RH : 11.24 Ref1 ? c

RH : 11.24 Ref1 ? 11.3

Press any key when ready ...

Now the device is waiting for the high end reference. Carry out the

high end adjustment as instructed in the following section.