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Description
Sequence
LO - GAS Gas concentration
too low to perform
proper calibration
9.1
Test gases
For test gas properties (e. g. humidity, concentration) refer to
the corresponding sensor data sheet.
Test gas humidity is irrelevant for O
Depending on the type of calibration different test gases are
used.
Zero gas
Zero gas is a test gas to calibrate the zero point. If ambient air
is free from interfering impurities and measured gas, it can be
used as zero gas. For O
sensors, nitrogen (N
2
Calibration gas
Calibration gas is a test gas to calibrate the sensor sensitivity
during span calibration. Calibration gas is a known
concentration of the measured gas diluted with clean air or
nitrogen. For O
sensors no calibration gas is needed, as
2
oxygen from ambient air is used.
9.2
Preparation of Calibration
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:
– Sensor has finished the warm-up phase
(7 Commissioning of the instrument).
9.2.1 Preparing calibration set-up
For all transmitters except Polytron 57x0 IR
Refer to 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 68 10 536).
– Tubing (3)
– Dräger calibration gas cylinder (4)
Instructions for use
|
Dräger Polytron 5000 Series
Action
Use higher cal gas concen-
tration or press up key
sensors.
2
) is used.
2
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 8.3.3 Entering the menu
For Polytron 57x0 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 68 11 610).
– 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 8.3.3 Entering the menu
9.2.2 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)
9.3
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.
|
Calibration
0.5 l/min ± 10%
0.5 l/min - 2 l/min
en
15
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