Test Gases; Preparing The Test Gas Supply; Zero Calibration With Oxygen - Dräger Polytron 6100 EC WL Instrucciones De Uso

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Calibration
During calibration, the measuring accuracy of the sensor is checked and
calibrated with a known test gas concentration. First, the zero-point and then
the sensitivity of the sensor is calibrated. The length of the calibration intervals
depends on the respective regional normative requirements.
To ensure proper operation, never calibrate the sensitivity before the zero-point
is set. If these operations are performed in the wrong order, the calibration is
incorrect.
WARNING
Incorrect calibration!
Incorrect calibration can lead to inaccurate measured values.
► After a sensor change, check all settings and parameters.
► Check a newly installed sensor with target gas to ensure correct operation.
10.1

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
CO sensors, nitrogen (N ) is used.
2 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
as oxygen from ambient air is used.
10.2

Preparing the test gas supply

The test gas must be supplied without pressure. This corresponds to a volume
flow of 500 ml/min.
44
sensors.
2
sensors no calibration gas is needed,
2
Instructions for use
Prerequisite:
– The warm-up phases of the sensor are complete (see "Commissioning",
page 42).
– The date and time are set correctly (check with PolySoft).
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.
Supplies:
– Test gas cylinder with pressure reducer, for corrosive gases with stainless
steel pressure reducer
– Calibration adapter with hose nozzles (order no. 68 10 536)
– Hose, type according to the gas property (e.g., FKM hose, order
no. 12 03 150)
Prepare the test gas supply:
1. Connect the calibration adapter (Fig. G 2) and test gas cylinder (Fig. G 4) to
and
2
the tube (Fig. G 3).
2. To discharge the test gas, connect a hose to the second connector on the
calibration adapter.
3. Attach the calibration adapter to the sensor (Fig. G 1).
10.3

Zero calibration with oxygen

In the case of O sensors, the zero-point is only checked (not calibrated) when
2
nitrogen is applied to the sensor. The gas detector indicates an error condition if
0.6 Vol% O is not undershot. In the event of an error, repeat the zero
2
calibration or change the sensor.
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Dräger Polytron 6100 EC WL, Dräger Polytron
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