Servomex 2700 Quickstart Manual
Servomex 2700 Quickstart Manual
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displayed. Select Y or N and press the ENTER key to
accept or refuse the new calibration value.
9. Press MEASURE to view and check the actual
concentration value and then remove the calibration gas
from the analyser.
3.4.2 Automatic calibration
The automatic calibration facility allows the Servomex 2700
analyser to perform routine calibrations without user
intervention. The calibration procedure to be used is specified
by a number of calibration parameters. These parameters must
be set up before an autocalibration is started. The
autocalibration procedure can perform either a low calibration
only or a high and low calibration on either one or both of the
possible sensor combinations in the analyser.
An automatic calibration may be started in three ways:
1. By timer
The automatic calibration will commence when a specified
start time and date is reached. If the start time is not
specified then the timed start is disabled. The calibration
procedure will then be repeated at specified time intervals.
If the specified time interval is zero then only one calibration
process will be done.
2. By contact closure
The automatic calibration will commence when the
automatic calibration initiation contacts (TB2 pins 11
and 12) are closed.
3. From the keypad
From the CALIBRATE menu, select AUTOCALIBRATE
and then START AUTOCAL.
In the automatic calibration process the calibration gases are
admitted to the sensor head via remotely actuated solenoid
valves. These solenoid valves are controlled by the relay
outputs on the control unit PCB. If a single sensor is being
calibrated then two gases and two relay outputs will be required.
If two sensors are being calibrated then three gases and three
relay outputs will be required. The relay outputs to be used are
configured and assigned by the user in the Setup facility (see
Section 3.3). Table 1 specifies the composition and calibration
duty for the three calibration gases.
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