Vaisala HMP228 User's Guide download pdf (Page 47)

Chapter 5 ___________________________________________ CALIBRATION AND ADJUSTMENT

10. Enter the second reference humidity value by using the arrow

keys. Press the OK key.

11. Confirm by pressing the YES key.

12. To return to the basic display, first press the BACK key, then

the EXIT key twice.

Calibration and Adjustment of

MMT318 Transmitters

You can check and adjust MMT318 transmitter reading against a

calibrated reference probe of MMP78 or against another reference

condition by using MI70 indicator in communication. Follow the first

4 steps and continue according to the chosen calibration method.

1. Connect the DRW216050-calibration cable between the screw

terminal connector of the MMT318 transmitter and the MI70

indicator.

2. Turn on MM70.

- In case you use a MMP78 probe as a reference: The reading

of the transmitter is shown on the first or middle row of the

display, depending on the connector port to which the

calibration cable is connected. Value of the port I is shown on

the upper row of the display and the value of the port II on

the lower row of the display. Difference of the readings is

shown on the lowest row.

- In case MI70 is used as an display, the reading of the

MMT318 transmitter is shown on the display.

3. Remove the MMI318 transmitter unit from the mounting plate

and press the adjustment key once. Now MI70 is starting the

Adjustment mode.

4. Press the OK key to start adjustment.

Field Checking and Adjustment by

Using a Calibrated Reference Probe

When using this adjustment method, start with the steps 1 through 4 in

the section

Calibration and Adjustment of MMT318 Transmitters on

page

45. Then proceed as follows:

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Vaisala HMP228 User's Guide Page 47