Performing A Bump Test; Sensor Replacement - Dräger Polytron 8000 Serie Instructions For Use

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.

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 28 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.
Dräger Polytron
®
8000 Series
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.
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.
6. Check calibration. If necessary, calibrate the instrument
(see "Calibration", page 18).
7. Check the installation requirements and instrument for SIL
status.
See sections "Explosion proof (Ex d) installation - without
Docking Station" through "Installation of sensors".
®
11.2.2 Polytron 8200 CAT, 8310 IR, 87x0 IR
Replacing the sensor
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
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 the sensor into the port and tighten with the correct
torque (min. 266 LB IN. / min. 30 Nm)
Maintenance en