Vaisala DRYCAP DMT340 SERIES Guia do Utilizador descarregar pdf (Página 132)

USER'S GUIDE____________________________________________________________________

132 _________________________________________________________________ M210704EN-E

Sensor Purge is an automatic procedure, in which the sensor is dried.

Thus, the sensor will response very fast when installing the probe from

an ambient to a dry gas. This will also ensure together with AutoCal the

best measurement accuracy and long-term stability.

As a default, the interval Purge and power-up Purge are turned on

automatically in DMT340. It is recommended not to turn them off. The

automatic sensor Purge can also be started manually. If enabled, power-

up Purge will start always about 10 seconds after reset. If the power is

continuously turned on in DMT340, the automatic sensor Purge will be

performed at an interval of 24 hours.

Manual Sensor Purge

The Purge should be performed always before calibration (see the

calibration instructions) or when there is a reason to believe that a sensor

has become exposed to an interfering chemical.

1. Open the MAIN MENU by pressing any of the arrow buttons.

2. Select Measuring, press the ►arrow button.

3. Select Purge, press the ►arrow button.

4. Select Manual Purge using the arrow buttons.

0706-015

Figure 71 Performing Manual Purge

5. Press START to start manual Purge. Press CANCEL to interrupt

the manual sensor Purge.

6. Press EXIT to return to the basic display.

Interval Purge

When the DMT340 leaves the factory the interval Purge takes place

repeatedly with the time intervals set in the factory. The 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.

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Vaisala DRYCAP DMT340 SERIES Guia do Utilizador Página 132