USER'S GUIDE____________________________________________________________________
124 _________________________________________________________________ M210762EN-D
Sensor Purge
Sensor Purge is available for DMT345 and DMT346. The Purge should
be carried out to achieve the shortest response times and the best long-
term stability.
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. Sensor Purge also corrects the possible gain drift
caused by some chemicals, thus ensuring 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 DMT345 and DMT346. 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 the transmitter, 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 64
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.