Maintenance
Dräger Polytron 8700/8720 29
10 Maintenance
10.1 Maintenance intervals
10.1.1 During commissioning
z Check calibration.
z Check signal transmission to controller and triggering of
alarms.
10.1.2 Every 6 months
z Inspection by trained service personnel.
The inspection intervals must be established in each individual
case and shortened if necessary, depending on technical
safety considerations, engineering conditions, and the
technical requirements of the equipment.
Contact DrägerService if you wish to take out a service
contract and have any repairs carried out.
10.1.3 As required
z Change the sensor, see chapter 10.2 on page 29.
10.2 Changing the sensor
The sensor is changed as follows:
1. Switch off the power to the unit or declassify the area
according to the local regulations.
2. Release the retaining screw and unscrew the housing
cover from the device.
3. Lift the handle and remove the enclosure with the main
electronics.
4. Disconnect the sensor cable.
5. Unscrew the PIR 7000/7200.
6. Pass the sensor cable through the threaded connection in
the housing.
7. Screw in the PIR 7000/7200.
8. Plug the sensor cable into the socket.
9. Re-fit the sensor electronics and enclosure.
10. Screw the housing cover on again and tighten the retaining
screw.
11. Switch on the power to the device.
12. If necessary, switch off SIL activation (see chapter 8.1 on
page 18).
13. Calibrate the device if necessary (see chapter 5 on
page 14).
14. If required, switch on SIL activation (see chapter 8.1 on
page 18).
10.3 Changing the main electronics
1. Switch off the power to the unit or declassify the area
according to the local regulations.
2. Release the retaining screw and unscrew the housing
cover from the device.
3. Lift the handle and remove the enclosure with the main
electronics.
4. Remove the protective caps for the connectors.
5. Unscrew the connector locking ring for the power supply
and relay and withdraw the connector.
6. Change the main electronics.
7. Plug the sensor cable and the connector for the power
supply and relay into the corresponding sockets and screw
them tight.
8. Re-fit the dust caps for the connectors.
9. Re-fit the sensor electronics and enclosure.
10. Screw the housing cover on again and tighten the retaining
screw.
11. Switch on the power to the device.
12. Check and adjust the configuration as required.
13. Calibrate the device if necessary (see chapter 5 on page 14).
11 Disposal
WARNING
As a matter of principle, always check a newly installed
sensor with measured gas to insure correct operation.
CAUTION
When the sensor is changed, all settings and
parameters must be checked for correctness.
NOTICE
The analog interface of the PIR 7X00 must be
configured to the following values (PIR 7x00 factory
settings):
Maintenance signal: 3.0 mA
Alt. maintenance signal: Off
Beam block warning: 2 mA (inactive)
Alternating warning signal: Off
Fault signal: 1 mA
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WARNING
Five threads must be engaged to insure explosion
protection.
Disposal of electrical and electronic equipment:
EU-wide regulations governing the disposal of
electric and electronic appliances which have been
defined in the EU Directive 2002/96/EC and in
national laws have been effective from August 2005
and apply to this device. Common household
appliances can be disposed of using special
collecting and recycling facilities. However, as this
device has not been registered for household usage,
it must not be disposed of through these means.
The device can be returned to your national Dräger
Safety Sales Organization for disposal. Please do not
hesitate to contact the above if you have any further
questions on this issue.
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