Series transmitters – Vaisala MM70 User Manual
Page 44
USER'S GUIDE____________________________________________________________________
Calibration and Adjustment of
HMP228 Series Transmitters
You can check all the parameters a
w
, 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 1 on page 10.
3.
Turn on the MM70.
4. Open
the
MENU. First press the right arrow key, then press the
OPEN key.
5. Select
Functions. Press the right arrow key.
6. Select
Calibrate transmitters. Press the right arrow key.
7. Select
1.Baud rate and 2.Serial format. Press the SET key to
change the serial settings. Serial settings of HMP228 and MM70
should be the same. (HMP228 factory serial settings: 4800, 7,
even 1).
8. Select
3.Start calibration, press the START key. If the serial
settings of MM70 are not compatible with the settings of
HMP228, or the cable connection is not working, ensure 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 the OK key.
10. Select the quantity to check (a
w
/T/RH) or to adjust (RH), press
the SELECT key.
11. Check the environment settings of MM70 probe, if needed.
Press the YES or NO key.
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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