Servomex 2700 Quickstart Manual
Servomex 2700 Quickstart Manual
14
3.4.1 Manual calibration procedure
1. Press the MENU key, then select CONFIGURE, enter a
valid password and then select CALIBRATE.
2. If two sensors are fitted in the sensor head then select
either OXYGEN or COe for the sensor to be calibrated.
3. Select LOW CAL or HIGH CAL for a low calibration or high
calibration measurement. The procedure for performing the
low or high calibration of an OXYGEN or COe sensor are
the same.
4. Use the arrow keys to set the actual concentration value for
the calibration gas used. Press the ENTER key to accept
the value.
5. Use the arrow keys to set the required tolerance level.
This is the permitted change in the stored calibration value.
Press the ENTER key to accept the value.
6. Apply the calibration gas to the sensor head calibration port
at a flow of 600ml/min. Note: if autocalibration is selected
then the relay outputs will be automatically set to admit the
required calibration gas.
7. Wait until the value displayed on the screen is stable.
Select Y and the ENTER key to accept the measured
value. Note: the displayed value will be calculated using the
existing stored calibration value.
8. Should the user accept a value that is outside of the
tolerance limits an OUT OF TOLERANCE message will be
NOTE
1. When a low calibration is performed, the zero may be
offset between the limits of -500 and +99ppm which
enables the effects of non-CO combustibles to be
compensated for. If this is done, the span calibration
target value should be adjusted by the same amount in
order to maintain accuracy. E.g. if the zero is adjusted by
-50ppm then the span should be set to 450ppm when
using a 500ppm CO calibration gas.
2. In calibration mode negative ppm combustibles values
are unfiltered and will differ from those displayed at top
level.
To Next Page
Loading...
Need help?
General
