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Maintenance
Only for Polytron 87x0 IR:
Number
Cause
163
Sensor tempera-
ture is very high.
171
Zero drift too high.
172
PIR 7x00 optics
dirty.
173
Zero calibration
expired for span
calibration
182
Automatic calibra-
tion not possible
with PIR 7200.
10
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 controller (see "Testing
the analog interface", page 33).
– Check LEDs as well as the triggering of the alarm device
(see "Testing alarms/relays", page 31).
Regularly:
– Perform calibrations, see 8 Calibration
10.1 Performing a bump test and checking
the response time (t90)
A bump test checks the response time without setting off an
alarm.
1. Select and confirm Settings > Instrument > Bump test.
The Maintenance symbol
The analog output is set to the maintenance signal.
2. Apply a known gas concentration to the sensor.
3. Check the response time and compare it with the t90
value indicated in the corresponding sensor data sheet.
4. Press [OK] to return to measurement.
10.2 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.
► Check calibration to verify proper operation.
28
Remedy
Perform zero calibration.
Clean PIR 7x00 optics.
Perform zero calibration.
Perform new zero and span
calibration
is displayed.
®
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 35).
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.
Instructions for use
®
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Dräger Polytron
8000 Series
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