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Calibration
7.6
Information on operation with a
Dräger SensorAlive
– If a menu is accessed on the transmitter or certain errors
are set, the Dräger SensorAlive does not perform a
LifeTest.
– The Dräger SensorAlive can suppress the instrument
calibration for a certain period of time (H
30 minutes).
– If a high level of accuracy is required for the duration of the
LifeTests, the time on the transmitter should be regularly
checked and adjusted as necessary.
– The menu entries for the Dräger SensorAlive are only
displayed if a Dräger SensorAlive is connected. The
dongle functions are also visible in this case, but are not
active.
8
Calibration
8.1
General information
– To ensure proper operation, adjust the zero-point first and
then the sensitivity. If these procedures are performed in
the incorrect order, adjustment cannot be continued due to
software settings.
– If the intended operation is at high altitudes, the display
value will be lower than that at sea level (reduced partial
pressure). New span adjustment is recommended if the
altitude or the ambient pressure changes. The factory
adjustment is set to sea level.
– Dräger recommends adjusting instruments with the gas to
be detected. This method is more accurate than a
surrogate gas adjustment. A surrogate gas adjustment
may only be performed as an alternative if a measured
gas adjustment is not possible.
– Sensors for methane and hydrogen should only be
adjusted with measured gas and not with surrogate gas.
– For the Polytron 8310 IR: Also observe the information in
the instructions for use for the DrägerSensor IR
During adjustment, the measurement accuracy of the sensor
is checked and adjusted with a known test gas concentration.
Adjustment must be performed on a regular basis. The length
of the adjustment intervals depends on the ambient conditions
in which the sensor is operated.
Ambient conditions and aging results in sensor drift. Sensor
drift reduces the display accuracy of measured gases.
Adjustment restores this display accuracy. Shorter adjustment
intervals must be selected depending on the extent of the drift.
To gauge the ambient conditions for new installations,
selecting short adjustment intervals and documenting the drift
is recommended. The system operator should define the
adjustment interval length with the aid of the collected data.
1) 9023981 (English), 9033555 (Bulgarian, Romanian), 9023984 (Span-
ish, Portuguese), 9023986 (Danish, Norwegian), 9033556 (Czech,
Croatian), 9033809 (Chinese), 9023985 (Hungarian, Polish), 9023982
(French), 9033557 (Slovak, Slovenian), 9033558 (Greek, Turkish),
9023987 (Italian, Dutch), 9023983 (Finnish, Swedish), 9023843 (Ger-
man)
22
If a Dräger SensorAlive is used, the drift is compensated and
can be read out.
Under normal conditions, Dräger recommends the following
adjustment intervals
– Electrochemical sensors (EC): 6–12 months
– Catalytic sensors (CAT): 4 months
– Infrared sensors (IR): 6–24 months
S sensor:
2
8.2
Please refer to the instructions for use provided for the
respective sensor for the test gas properties (e.g. relative
humidity, concentration). If there is no information provided
relating to relative humidity, dry test gas can be used for the
adjustment. The humidity of the test gas is not relevant for O
sensors.
Depending on the type of adjustment, various types of test
gas are used.
Zero gas
The zero gas is a test gas used for adjustment of the zero-
point of a sensor. Nitrogen (N
sensors. With other sensors, ambient air can be used once it
is free from disruptive contamination and the measured gas.
Adjustment gas
The adjustment gas is a test gas used for adjustment of the
sensitivity of a sensor. The adjustment gas is a known
concentration of the measured gas, diluted with clean air and
nitrogen. Adjustment gas is not required for O
oxygen from the ambient air is used.
8.3
The gas flow varies according to each sensor.
EC sensor, CAT sensor
All other sensors
1)
.
The gas flow should correspond with the ambient conditions
during operation (e.g. duct measurement with flow higher than
2 L/min)
8.4
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).
2) Observe the instructions for use for the sensor.
3) For applications in accordance with EN 45544-1 and EN IEC 62990-1,
the adjustment interval must not exceed 6 months.
2)
:
Test gases
) is used for O
2
Gas flow for adjustments
0.5 L/min ± 10 %
0.5 L/min - 2 L/min
Preparing for adjustment
Instructions for use
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Dräger Polytron
3)
3)
2
and CO
2
2
sensors, as
2
®
8000 Series
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