9023927 - 2nd edition - May 2007
Page 23 of 72 Pages
Maintenance
Replacing the sensor
The sensor can be replaced, if necessary, without interrupting the supply voltage.
Use only DrägerSensors, which are approved for use with the Polytron 7500.
●
In the menu » Settings « select the sub-menu » Sensor « and then the function
» Change sensor « – page 56.
●
Remove the cover of the Polytron 7500, by gently pulling apart the cover on both
sides and lifting upwards.
1
Loosen the sensor adapter from the sensor.
2
Remove the sensor from the socket on the printed circuit board.
●
Remove the new sensor from the packaging. Check that the sensor type is iden-
tical to the one which is installed in the Polytron 7500.
Remove the protective cap from the sensor on the DrägerSensor XS PFC!
●
There is a coded connector on the back of the sensor. Insert the sensor such into
the socket on the printed circuit board so that the code of the connector matches
the code of the socket.
Incorrect connection can damage the sensor!
1
Fit sensor adapter onto the sensor.
●
Refit the cover of the Polytron 7500.
●
Check the sensor function.
— The configuration of the Polytron 7500 is kept in its entirety, see also “– Sensor
Disposal of electrochemical sensors:
— Sensors must be disposed of as special waste.
Note the relevant waste disposal regulations.
Further information can be obtained from the relevant local authority and from ap-
propriate waste disposal companies.
Type
Order No.
Polytron 7500
DrägerSensor
Dräger Polytron 7500 NF
3
0 to 50 ppm NF
3
(CAS 7783-54-2)
83 18 827
68 11 125
Dräger Polytron 7500 PFC
0 to 30 ppm C
5
F
8
(CAS 559-40-0)
0 to 30 ppm C
4
F
6
(CAS 685-63-2)
83 18 828
68 11 120
Dräger Polytron 7500 NF
3
LON
0 to 50 ppm NF
3
(CAS 7783-54-2)
83 18 829
68 11 125
Dräger Polytron 7500 PFC LON
0 to 30 ppm C
5
F
8
(CAS 559-40-0)
0 to 30 ppm C
4
F
6
(CAS 685-63-2)
83 18 830
68 11 120
Attention!
When the unit is opened
,
there is the danger of scalding yourself on hot
parts of the Polytron 7500.
Caution:
— Do not throw sensors into the fire – explosion hazard.
— Do not open sensors forcibly – risk of caustic burns.
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