Dräger Polytron 8100, Инструкция по эксплуатации, Страница: 30 / 254

30 Dräger Polytron 8100
Maintenance
6 Maintenance
6.1 Maintenance intervals
6.1.1 During commissioning
 Check calibration.
 Check signal transmission to the central controller, LEDs
and triggering of alarm devices.
6.1.2 Every 6 months
 Inspection by trained service personnel.
 Check signal transmission to the central controller, LEDs
and triggering of alarm devices.
 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.
 Contact Dräger Service to contract regular calibration and
maintenance services.
6.1.3 Change sensor on demand
To change the sensor, see Section 6.4 on Page 35.
6.2 Calibration
Calibration of the instrument must be performed at regular
intervals as detailed in the sensor data sheet.
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).
Refer to figure E on the fold-out page.
1 Dräger pressure regulator
2 EC sensing head
3 Draeger calibration adapter
4 Tubing
5 Dräger calibration gas cylinder
General procedure
1. Attach the pressure regulator to the calibration gas
cylinder.
2. Fit calibration adapter to the sensor.
3. The gas flow should be approximately 0.5 L/min.
4. If the intended operation is at high altitudes, the reading will
be 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.
5. Connect the tubing to the barbed fitting.
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.
NOTICE
Calibration is not possible if the date and time are not
set (see Section 5.8.3 on Page 22).
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