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11
Maintenance
– The maintenance intervals must be established for each
individual installation. Depending on safety considerations
and application specific conditions the instrument is used
in, these might need to be shortened.
Every 6 months
– Inspection by trained service personnel.
– Check signal transmission to the central controller, LEDs
and triggering of alarm devices.
Calibrations have to be performed on a regular basis, see
9 Calibration
► To check the signal transmission to the central controller,
(see "Testing the analog interface", page 23)
► To check LEDs and triggering of alarm devices, (see
"Testing alarms/relays", page 21)
O
-Sensor test
2
To test Oxygen (O
) sensors for the proper zero point, only
2
nitrogen (N
) must be used! A test does not calibrate the
2
sensor. If the zero point is incorrect, contact Dräger or replace
the sensor.
11.1 Sensor replacement
WARNING
Faulty Calibration
Faulty Calibration may cause inaccurate readings.
► If the sensor is replaced, all settings and parameters must
be checked for correctness.
► Always test a newly installed sensor with target gas to
verify proper operation.
11.1.1 Polytron 5100 EC
A sensor can be replaced in the hazardous, classified area,
without interrupting the power supply.
Replacing the sensor
Refer to figure C on the fold-out page.
A sensor can be replaced at any time.
1. Replace the old sensor with a new sensor:
a. Loosen set-screw (2)
b. Unscrew bayonet ring (3)
c. Insert sensor (4) into the opening. The Dräger logo on
the sensor must point to the mark on the sensing head
housing (5).
d. Lock sensor with bayonet ring (3)
e. Tighten set-screw (2). Mandatory for Zone 22
installations.
2. 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.
3. Check the installation requirements and instrument for SIL
status.
See sections "Explosion proof (Ex d) installation - without
Docking Station" through "Installation of sensors"
Instructions for use
|
Dräger Polytron 5000 Series
11.1.2 Polytron 5200 CAT, Polytron 5310 IR,
Polytron 57x0 IR
1. If required, 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 the threaded port of the
enclosure.
WARNING
8.
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.
Screw the sensor into the port and tighten with the correct
torque (min. 266 LB IN. / min. 30 Nm)
9. Polytron 5200 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.
Figure on fold-out page
G1
G2 socket designated CAT
G2 socket designated DSIR
11. Place PCB unit back into the enclosure.
12. Screw the lid back on until it is sealed (min. 62 ±17.7 LB
IN. / min. 7 ±2 Nm) and tighten set-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. Calibrate instrument.
15. Check the installation requirements and instrument for SIL
status.
See sections "Explosion proof (Ex d) installation - without
Docking Station" through "Installation of sensors".
|
Maintenance
Sensor
PIR 7x00
Polytron 57x0 IR
DD/DQ, LC sensor
Polytron 5200 CAT
DSIR
Polytron 5310 IR
en
19
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