24
Dräger Polytron 5100
Maintenance
5.4
Replacing the sensor
!!
CAUTION
Always test a newly-installed sensor with target gas to
verify proper operation.
If the sensor is replaced, all settings and parameters
must be checked for correctness.
i
i
NOTICE
The sensor can be replaced in the hazardous,
classified area, without interrupting the power supply.
i
i
NOTICE
If a different sensor part number has been installed,
the display will toggle between ‘SNR’ and ‘Lock’
indicating that if accepted, factory defaults will be
loaded from the sensor.
To accept the new sensor, tap and hold [OK]. A
countdown will start from 5 to ensure that the sensor
will not be accepted by accident.
If the sensor is changed, all settings must be checked
for correctness.
To replace the sensor:
z
Loosen set-screw (2), 2
mm Allen screw.
3
4
5
2
00733298.eps
1
4544911h
z
Unscrew bayonet ring
(3) and remove old
sensor.
z
Remove new sensor
from packaging.
z
Insert sensor (4) into the
opening. The Dräger
logo on the sensor must
point to the mark on the
sensing head housing
(5).
z
Lock sensor with
bayonet ring.
z
Tighten set-screw (2).
Mandatory for Zone 22
installations.
z
If necessary, apply the
label included with the
sensor to the
instrument.
This identifies the gas
type from a distance,
even if the power has
failed.
z
Calibrate instrument, if necessary, see Section
5.2
on
Page
20.
5.5
Replacing the main electronics
!!
CAUTION
Always test a newly-installed main electronics with
target gas to verify proper operation.
If the main electronics is replaced, all settings and
parameters must be checked for correctness.
To replace the main electronics:
Turn off power to the instrument or declassify the area
according to local regulations.
z
Loosen set-screw and unscrew lid from instrument.
z
Remove the bezel, by grasping the notches on either side
of the display with your fingers and carefully pull it out from
the enclosure.
z
Turn bezel over and pull off the power, relay and sensor
connectors.
z
Replace the main electronics.
z
Plug the power, relay and sensor connectors back into the
appropriate sockets and tighten screws.
z
Place bezel back into the enclosure.
z
Screw the lid back on until it is seated (see Section
9.8
on
Page
28) and tighten set-screw.
z
Apply power to the instrument.
z
Check all settings and parameters.
z
Calibrate instrument, if necessary, (see Section
5.2
on
Page
20).
5.6
Cleaning the instrument
Clean the instrument with a soft cloth using water and a mild
detergent. Rinse with water.
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