14
Dräger Polytron 2000
Maintenance
6.3
Changing the sensor
1. Open the front cover of the service port by turning it
counterclockwise (approx. 60°). The maintenance switches
and potentiometers for calibration are accessible.
2. Move maintenance
switch (1) to the right
position. The 4 to 20 mA
output switches to mainte-
nance mode. This position
outputs a maintenance sig-
nal at the analog output and
prevents alarms from being
triggered.
3. Unscrew bayonet ring (2)
from the transmitter and
remove old sensor.
4. Mount the new sensor in
the sensor adapter (see
MEC Key assembly
instructions).
5. The back of the sensor
adapter has a coded plug.
Insert the sensor adapter
into the sensor opening with
the plug code to the back
and the Dräger logo pointing forward.
Before pressing the plug into the socket, make sure that
the plug and socket match. An incorrect connection may
damage the sensor.
6. Lock sensor adapter in the transmitter with bayonet ring (2).
7. Wait until the measured value is below the alarm threshold
set in the central controller. Otherwise an alarm will be
triggered if the maintenance switch is set to the measuring
mode position immediately after replacing the sensor.
8. Move maintenance
switch (1) to the left position.
The 4 to 20 mA output
switches to measuring
mode.
9. Insert the front cover into
the service port and turn it
clockwise (approx. 60°) with
a hexagonal wrench to
close it.
After the sensor warm-up phase is complete:
For transmitters that are set for transmitter-specific calibration
with calibration gas
Calibrate the sensor, page 12.
For transmitters that are set to use the factory-set calibration
of the sensor.
The transmitter is ready for operation.
Disposal of electrochemical sensors:
Dispose of as hazardous waste.
Observe the applicable local waste disposal regulations.
For information consult your local environmental agency, local
government offices or appropriate waste disposal companies.
NOTICE
The MEC Key sensor adapter is required to install the
DrägerSensor MEC sensor.
CAUTION
Use only the Allen key (5 mm) without a ball head.
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Polytron
1
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Polytron
2
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Polytron
1
CAUTION
Do not dispose of in fire, risk of explosion.
Do not open with force, risk of burns.
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