Vaisala HUMICAP MMT310 User's Guide download pdf (Page 41)

Chapter 5 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 39

LI Reverting the factory calibration

1. Remove the transmitter unit from the mounting plate (see page 12)

and press the adjustment button, see page 26.

2. Type command LI and give value 0 for an offset value and value 1

for a gain value.

LI ↵

>li

RH offset : -0.6000000 ? 0

RH gain : 1.00000000 ? 1

T offset : 0.00000000 ? 0

T gain : 0.40000000 ? 1

3. Reset the transmitter by giving a command RESET. Transmitter

returns to normal mode

FCRH Relative humidity calibration after sensor change

FCRH ↵

The transmitter asks and measures relative humidity and calculates the

calibration coefficients. This 2-point adjustment should be performed

after a sensor change. Follow the more detailed calibration

instructions on page 35, but instead of giving CRH command, use

FRCH command.

>FCRH ↵

RH : 1.82 1. ref ? 0 ↵

Press any key when ready... ↵

RH : 74.22 2. ref ? 75 ↵

The OK indicates that the calibration has succeeded.

CTEXT Giving text to calibration information field

CTEXT ↵

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Vaisala HUMICAP MMT310 User's Guide Page 41