Maintenance; Performing A Bump Test; Checking Response Time (T90); Sensor Replacement - Dräger Polytron 8000 Serie Notice D'utilisation

®
Polytron 87x0 IR-specific:
Warning Cause
number
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 Auto calibration not
possible with PIR
7200.
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 27)
● To check LEDs and triggering of alarm devices, (see
"Testing alarms/relays", page 26)

11.1 Performing a bump test

A bump test checks alarm activation without setting off the
alarms.
1. Select Settings > Instrument > Bump test and confirm.
 The maintenance symbol is displayed
 The analog output is set to the maintenance signal.
2. Apply a known concentration of gas.
3. Press OK to return to measurement.

11.1.1 Checking response time (t90)

1. Perform a bump test and check the response time.
2. Compare the response time with the t90 values that are
indicated in the corresponding sensor data sheet.
CAUTION
Delayed response time at the gas detection control unit.
If the transmitter is connected to control units, the total
response time could be delayed. The entire measuring path
must be taken into account (e. g. latency of the control unit).
► Ensure that the required response time is kept.
Instructions for use |
Dräger Polytron
Remedy
Perform zero calibration
Clean PIR 7x00 optics.
Perform zero calibration
Perform new zero and span
calibration
®
8000 Series

11.2 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.
®
11.2.1 Polytron 8100 EC
A sensor can be replaced in the hazardous, classified area,
without interrupting the power supply.
Sensor lock function
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, calibration
interval, etc.) Otherwise the factory default settings of the new
sensor are uploaded and will overwrite the instrument specific
configuration. This can be prohibited if the sensor lock
function 29 is activated.
Sensor change function
With the menu function Change Sensor, a sensor can be
changed during operation without triggering a fault signal at
the control unit. It also ensures that all sensor data in the
microprocessor can be saved in the sensor memory
(EEPROM) before disconnecting the sensor.
Replacing the 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 Please remove the sensor.
 The Maintenance symbol is displayed.
2. 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.
 The display shows: 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.
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Maintenance
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