20 Dräger Polytron 5100
Maintenance
5 Maintenance
5.1 Maintenance intervals
5.1.1 During commissioning
z
Check calibration.
z
Check signal transmission to the central controller, LEDs
and triggering of alarm devices.
5.1.2 Every 6 months
z
Inspection by trained service personnel.
z
Check signal transmission to the central controller, LEDs
and triggering of alarm devices.
z
The maintenance intervals must be established for each
individual installation. Depending on safety considerations
and application specific conditions the instrument is used
in, these might need to be shortened.
z
Contact Dräger Service for periodic and scheduled
contract calibration and maintenance services.
5.1.3 Change sensor on demand
z
To change the sensor, see Section 5.4 on Page 24.
5.2 Calibration
Calibration of the instrument must be performed at regular
intervals as detailed in the sensor data sheet.
!
WARNING
Calibration gas must not be inhaled! See appropriate
Material Safety Data Sheets. Calibration gas should be
vented into a fume hood or to the outside of the
building.
For proper operation, never adjust the span before
completing zero adjustment. Performing these
operations out of order will cause the calibration to be
faulty
.
Dräger recommends calibrating instruments with target gas.
This method of target gas calibration is more accurate than a
surrogate gas calibration.
A surrogate gas calibration may only
be performed as an alternative if a target gas calibration is not
possible.
The sensor should be fully warmed-up (see sensor data
sheet).
General procedure
z
Attach the pressure regulator to the calibration gas
cylinder.
z
Fit calibration adapter to the sensor.
z
The gas flow should be approximately 0.5 L/min.
z
If the intended operation is at higher altitudes, the factory
calibration will result in a reading lower than the reading at
sea level (reduced partial pressure). A new span
calibration is recommended if the altitude or the ambient
pressure is changed. The factory calibration is set to sea
level.
z
Connect the tubing to the barbed fitting.
00533298.eps
1
5
4
3
2
1 Pressure regulator
2 EC sensing head
3 Calibration adapter
4 Tubing
5 Calibration gas cylinder
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