Vaisala HMP228 Betriebsanweisung PDF herunterladen (Seite 37)

Chapter 10 _______________________________________Calibration and adjustment of transmitters

VAISALA _______________________________________________________________________ 35

Calibration and adjustment of HMP228 series

transmitters

You are able to check all the parameters a

, T and RH but only RH can be

adjusted. You can calibrate your transmitter against a calibrated reference

probe of MM70 or against a calibrator's reference humidity by using MI70

indicator in communication. Follow the first 12 steps and continue

according to the chosen calibration method.

1. Connect the 27159ZZ-calibration cable to the X5 connector of the

HMP228-series transmitter (X5 connector = 6-pin connector on the

left side of the motherboard).

2. Connect the other end of the calibration cable to either of the

MM70's connector port located on the bottom of the indicator, see

figure on page 34.

3. Turn on the MM70.

4. Open the MENU: press OPEN.

5. Select Functions, press .

6. Select Calibrate transmitters, press .

7. Select 1.Baud rate and 2.Serial format. Press SET to change the serial

settings. Serial settings of HMP228 and MM70 shall be the same.

(HMP228 factory serial settings: 4800, 7, even 1).

8. Select 3.Start calibration, press START. If the serial settings of MM70

are not compatible with the settings of HMP228, or the cable

connection is not working check that the serial settings of HMP228

and the settings of MM70 are the same. Check the cable connection.

Then retry connection in step 6.

9. After connection has been established start the

calibration/adjustment by pressing OK.

10. Select the quantity to check (a

/ T / RH) or to adjust (RH), press

SELECT.

11. Check the environment settings of MM70 probe, if needed. Press

YES or NO.

12. The first row shows the reading of the probe/transmitter connected to

the port I, the second row shows the reading of the probe/transmitter

connected to the port II. The third row ∆RH is the difference

between the readings of the ports.

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Vaisala HMP228 Betriebsanweisung Seite 37