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Calibration
8.4
Preparing for adjustment
General information
WARNING
Health hazard due to test gas
Inhaling test gas may risk health or lead to death.
► Do not inhale test gas.
► Observe risks and security statements related to the test
gas (Refer to data sheets and instructions figuring on
calibration devices).
CAUTION
Triggering alerts by test gas
Applied test gas may trigger alerts.
► Make sure that test gas is no longer applied after
calibration.
Prerequisites
– The sensor warm-up phase has been completed (see
"Commissioning the gas detector", page 16).
– The date and time have been set (see "Setting date and
time", page 31).
– If a Dräger SensorAlive is used, the last LifeTest must be
sufficiently long ago (see the instructions for use of the
sensor).
Special feature of the Polytron 8310
Dräger recommends carrying out an automatic zero
calibration on the sensor before adjustment of the zero-point.
This resets the zero-point tracking of the DrägerSensor IR,
and the full tracking range is available.
1. Turn off the alarm activation for the gas detector (see
"Switching the alarms on or off", page 32).
2. Use the calibration adapter to apply nitrogen, synthetic air,
or clean air to the sensor and wait until a stable measured
value is shown.
3. Set the magnetic wand on the area marked with the
symbol (inside of the black border) on the surface of the
sensor shell and hold it in place for at least 5 seconds.
After 5 seconds, the sensor output signal switches to the
display of the calibration signal (display change by approx.
–10 %LEL) for as long as the magnetic wand is held in
place. At the same time, a zero calibration of the optical
measurement system is automatically performed.
4. Remove the magnetic wand. After 30 seconds, the
instrument exits the automatic zero calibration routine. To
confirm the automatic zero calibration, the output signal
switches back to the calibration signal (display change to
approx. –10 %LEL). This signal is also displayed for the
same length of time as when starting the automatic zero
calibration routine.
5. Turn on the alarm activation for the gas detector.
Polytron 8100, Polytron 8200, Polytron 8310
See figure B on the fold-out page.
24
Adjustment equipment:
– Dräger pressure regulator (1), use a stainless steel
pressure regulator for reactive gases
– Dräger calibration adapter (2) (part number 6810536)
– Hose (3)
– Dräger test gas cylinder (4)
Preparing adjustment:
1. Connect the pressure regulator to the test gas cylinder.
2. Mount the calibration adapter on the sensor.
3. Connect the hose to the plug nipple connection.
4. Open the menu (see "Opening menus", page 19).
Polytron 87x0 IR
See figure B on the fold-out page.
Adjustment equipment:
– Dräger pressure regulator (1), use a stainless steel
pressure regulator for reactive gases
– Dräger calibration adapter (5) (part number 6811610)
– Hose (3)
– Dräger test gas cylinder (4)
Preparing adjustment:
1. Connect the pressure regulator to the test gas cylinder.
2. Fit the calibration adapter to the splash guard so it snaps
into place.
This does not apply for mounting on ducts or if a process
adapter or process cuvette is used (see installation
instructions for the corresponding PIR 7x00 accessory).
3. Ensure that the sealing surfaces around the openings of
the splash guard are clean. The insect guard does not
have to be removed.
4. Connect the hose to the plug nipple connection.
5. Open the menu (see "Opening menus", page 19).
8.5
Zero calibration
0
8.5.1 General information
Ambient air can be used to calibrate the zero-point of the
sensor instead of nitrogen or synthetic air only if the ambient
air is known to be free of the target gas and any other gas to
which the sensor may be cross-sensitive (as listed on the
sensor data sheet). In this case, no cylinder or calibration
adapter is needed for the zero calibration.
WARNING
Calibration fault at zero calibration
Insufficient ambient air flow may cause calibration errors.
► Make sure that the ambient air flow to the sensor is
sufficient.
Instructions for use
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Dräger Polytron
®
8000 Series SW version ≥ 4.0.x
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