Vaisala PTU300 Uživatelská příručka stáhnout pdf (Strana 144)

User's Guide _______________________________________________________________________

142 __________________________________________________________________ M210796EN-G

- the sensor temperature must be below 100 °C. At higher temperatures

the chemicals evaporate spontaneously from the sensor and the

chemical purge is not necessary.

Automatic Chemical Purge (Interval Purge)

When PTU300 leaves the factory the automatic chemical purge (if

chosen) takes place repeatedly with the time intervals set in the factory.

User can change the interval in which the purge takes place by using

serial commands or with the optional display/keypad. This can be needed

if the measuring environment contains high concentrations of interfering

chemicals. The automatic chemical purge can also be turned off if

necessary.

Manual Chemical Purge

The chemical purge should be performed always before calibration (see

section Calibration and adjustment on page 161) or when there is a

reason to believe that a sensor has become exposed to an interfering

chemical. Make sure that the temperature of the sensor has come down to

normal temperature before starting a calibration.

Chemical Purge in Power Up

Chemical purge (start-up purge) can be set to start within 10 seconds

from the power-up of the device.

Starting and Configuring Chemical Purge

Using Buttons On Motherboard

Start manual chemical purge by pressing simultaneously two PURGE

buttons on the motherboard inside the transmitter for a few seconds.

Indicator LED flashes until purge is complete (up to 6 minutes).

0508-011

Figure 64 Purge Buttons on Motherboard

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Vaisala PTU300 Uživatelská příručka Strana 144