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Maintenance
®
10.2.1 Polytron
8100 EC
A sensor can be replaced in the hazardous, classified area,
without interrupting the power supply.
Sensor lock feature
If a sensor of the same type (same part number) was
previously installed, the instrument-specific configuration is
retained (gas type, measuring range, test gas, adjustment
interval, etc.). Otherwise, the factory default settings of the
new sensor are uploaded and will overwrite the instrument-
specific configuration. This can be prevented if the sensor
lock feature is activated (see "Setting sensor lock", page 37).
Sensor change function
The Change Sensor menu function lets you replace a sensor
during operation without triggering a fault signal at the
controller. It also ensures that all sensor data in the
microprocessor can be saved in the sensor memory
(EEPROM) before disconnecting the sensor.
Replacing a sensor
See figure C on the fold-out page.
A sensor can be replaced at any time.
1. Select Settings > Sensor > Change Sensor and confirm.
The maintenance signal is generated on the 4-20mA
interface.
The display shows the following: Please remove the
sensor.
The Maintenance symbol is displayed.
2. Replace the old sensor with a new sensor:
a. Loosen the locking screw (2) (2 mm Allen screw).
b. Unscrew bayonet ring (3)
c. Insert the sensor (4) into the opening and turn until it
engages in the gas detector. This does not damage
the sensor plug.
d. Secure the sensor with the associated bayonet ring
(3).
For Dräger SensorAlive, a different bayonet ring
needs to be used than for other EC sensors.
e. Tighten the locking screw (2) so that the bayonet ring
cannot come loose (required for installations in
zone 22).
The display shows the following: Loading data,
please wait
3. 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.
4. When the sensor data are loaded, the display shows: Data
loaded.
5. Select Back to menu and confirm.
The maintenance signal on the 4-20mA interface
remains pending until the sensor is warmed-up.
Maximum warm-up time of a new sensor: see the
Instructions for Use for the sensor. For Oxygen: EN
50104 approvals.
30
6. Check calibration. If necessary, calibrate the instrument
(see "Calibration", page 23).
7. Check the installation requirements and instrument for SIL
status.
See sections "Explosion proof (Ex d) installation - without
Docking Station" to "Installation of sensors or sensing
heads".
10.2.2 Polytron
Replacing a sensor
1. If necessary, set the maintenance current for the analog
interface.
2. Turn off power to the instrument or declassify the area
according to local regulations.
3. Loosen set-screw and unscrew lid from instrument.
4. Pull out the PCB unit.
5. Turn PCB unit over and pull off the sensor connector.
6. Unscrew the sensor.
7. Insert the sensor wires through he threaded port of the
enclosure.
WARNING
Explosion hazard!
The enclosure openings must be sealed to prevent ignition of
hazardous atmospheres in case of an ignition inside the
enclosure.
► Five threads must be engaged to ensure explosion proof
status.
8. Screw in the sensor and tighten with the correct tightening
torque (min. 266 in-lbs / min. 30 Nm)
®
9. Polytron
8200 CAT-specific:
Twist the sensor wires together. If necessary, fit a cable tie
to keep the wires tight.
10. Plug the sensor connector back into socket.
11. Place PCB unit back into the enclosure.
12. Screw the cover on the instrument until it is correctly
engaged (min. ≥44 in-lbs / min. ≥5 Nm) and tighten the
locking screw.
13. Apply power to the instrument, if necessary.
The maintenance signal on the 4-20mA interface
remains pending until the sensor is warmed-up.
Maximum warm-up time of a new sensor: see the
Instructions for Use for the sensor.
14. Check calibration. If necessary, calibrate the instrument
(see "Calibration", page 23).
15. Check the installation requirements and instrument for SIL
status.
See sections "Explosion proof (Ex d) installation - without
Docking Station" to "Installation of sensors or sensing
heads".
Instructions for use
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Dräger Polytron
®
8200 CAT, 8310 IR, 87x0 IR
®
8000 Series SW version ≥ 4.0.x
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