Gas Flow For Calibrations; Zero Calibration; Performing Zero Calibration - Dräger PointGard 2000 Série Mode D'emploi

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 7.6.3 Entering the menu
For PointGard 27x0 IR:
Refer to the following figure.
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 7.6.3 Entering the menu
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CAT Ex
EC
Instructions for use |
Dräger PointGard 2000 Series
PIR 7x00
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DSIR
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8.3

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)
8.4

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.
PointGard 2100 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 PointGard 2100 EC will
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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PointGard 2200 CAT-specific:
Sensors must not be calibrated with pure nitrogen. Catalytic
sensors need oxygen to work properly.
PointGard 27x0 IR-specific:
For PointGard 2720 IR (with PIR 7200 to detect carbon
dioxide), only Nitrogen or Synthetic Air without any CO
content may be used for a zero calibration.

8.4.1 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.
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Calibration
0.5 l/min ± 10%
0.5 l/min - 2 l/min
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