Preparing Calibration Set-Up; Gas Flow For Calibrations; Performing Zero Calibration - Dräger Polytron 8000 Serie Instructions For Use

– Sensor has finished the warm-up phase
(7 Commissioning of the instrument).
– Date and Time are set (12.2 Setting date and time).

9.2.1 Preparing calibration set-up

For all transmitters except Polytron
See figure B on the fold-out page.
Calibration equipment:
– Dräger pressure regulator (1), for reactive gases use
stainless steel pressure regulator
– Dräger calibration adapter (2) (part number 6810536).
– Tubing (3)
– Dräger calibration gas cylinder (4)
Prepare calibration
1. Attach the pressure regulator to the calibration gas
cylinder.
2. Fit calibration adapter to the sensor.
3. Connect the tubing to the barbed fitting.
4. Enter the menu, see 8.6.3 Entering the menu
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For Polytron 87x0 IR:
See figure B on the fold-out page.
Calibration equipment:
– Dräger pressure regulator (1), for reactive gases use
stainless steel pressure regulator
– Dräger calibration adapter (5) (part number 6811610).
– Tubing (3)
– Dräger calibration gas cylinder (4)
Prepare calibration:
1. Attach the pressure regulator to the calibration gas
cylinder.
2. Fit calibration adapter to splash guard until it snaps into
place.
This does not apply for duct mount applications or if the
process adapter number is used (see installation
instructions for PIR 7x00 accessories).
3. Make sure 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 tubing to the barbed fitting.
5. Enter the menu, see 8.6.3 Entering the menu
9.3

Gas flow for calibrations

Gas flow varies depending on the sensor.
EC sensor
All other sensors
Gas flow should correspond to the environmental conditions
during operation (e. g. duct measurement with higher flows
than 2 l/min)
Dräger Polytron
®
87x0 IR:
0.5 l/min ± 10%
0.5 l/min - 2 l/min
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8000 Series
9.4 Zero calibration
Ambient air can be used to zero the sensor instead of
Nitrogen or Synthetic Air only if the area is known to be free of
the target gas or any 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.
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Polytron 8100 EC-specific:
For Oxygen (O ) sensors a zero calibration does not change
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any value in the firmware or sensor. Thus, the zero calibration
function can be used to check the correct zero reading when
Nitrogen is applied to the sensor. The Polytron
indicate a fault state if a zero check fails with a deviation of
more than 0.6 Vol% O from zero. In case of a fault, repeat
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the zero check or change the sensor if necessary. Use
Nitrogen (N ) for verification.
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Polytron 8200 CAT-specific:
Sensors must not be calibrated with pure nitrogen. Catalytic
sensors need oxygen to work properly.
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Polytron 8720 IR-specific:
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For Polytron 8720 IR (with PIR 7200 to detect carbon
dioxide), only Nitrogen or Synthetic Air without any CO
content may be used for a zero calibration.

9.4.1 Performing zero calibration

Calibration can be aborted at any time. To abort calibration
select back.
Prerequisites:
– Sensor has finished the warm-up phase
– Calibration is prepared.
Perform zero calibration
1. Select Calibration > Zero calibration and confirm.
 The Maintenance signal is transmitted by the analog
interface, no alarm or fault relays are switched and the
symbol is displayed.
 The message Apply zero gas is displayed.
2. Apply synthetic air or nitrogen, if ambient air cannot be
used.
a. Set gas flow corresponding to the sensor used (see
"Gas flow for calibrations", page 19)
3. Select Next and confirm.
 The current value is displayed.
After 15 minutes without confirmation, the instrument
reverts to the calibration menu without performing a
calibration.
Calibration en
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8100 EC will
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