Vaisala DEWCAP DM500 Guia do Utilizador descarregar pdf (Página 68)

User's Guide ______________________________________________________________________

66 __________________________________________________________________ M210205EN-D

If the salt detection sees salt on the sensor (message on the display),

please clean the sensor carefully, see page 113. The salt warning

message is shown when the measured value decreases below 80 % of

the salt detection limit. It is not recommended to use serial commands

during the salt detection. Salt detection interrupts the dewpoint

measurement for approximately one minute.

The salt detection function is enabled as follows:

1. Open

MENU: press .

2. Select ►Measuring, press .

3. Select ►Self diagnostics, press .

4. Select ►

Salt detection.

5. To enable the automatic sensing, select

Autodetect interval, press

SET and give the salt sensing interval (1...99 h) by using the

numeric buttons.

6. Press OK.

7. Carry out this step only if you want to determine the clean

sensor value after cleaning.

Select Clean sensor value, press DETERMINE. In this stage, the

system measures the salt detection limit (clean reference). To

disable the automatic sensing, press OFF.

8. To start the manual salt sensing test, select Manual salt sensing

and press START.

9. Press EXIT to return to the main view.

Sensor Circuit Check

During the sensor circuit check the sensor is heated up and the

propagation of the RF-signal through the circuit is checked. If the

system is not operating as expected the error message is shown, see

page 115, Error Messages. The sensor circuit check also re-calculates

the transmission for a dry sensor, thus performing contamination

compensation.

Sensor circuit check is performed automatically each time when the

measuring is started. During the measuring, the periodical checking is

not done (default) unless the automatic sensor circuit check is turned

on by setting the interval. In case there is a need for checking the

operation of the sensor periodically, or if automatic dry-out cycle for

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Vaisala DEWCAP DM500 Guia do Utilizador Página 68