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Maintenance
Unit calibration
When the transmitter is installed in Ex areas Class II, Div. 1 & 2, Group E, F, G,
the opening of the housing (required for calibration) must not be done when con-
nected to power (power must be turned off or the area has to be temporarily
declassified). Explosion hazard!
— Ensure that the sensor is warmed up before it is calibrated. See the sensor data
sheet for the warming-up time.
— Only the zero point is checked if an oxygen sensor has been fitted. The zero
point of an oxygen sensor does not require calibration.
— The transmitter can be calibrated by the operator on site.
— For critical applications, the calibration intervals should be defined in accor-
dance with the recommendations in EN 50073
gulations.
Note the calibration sequence!
First check the zero point and correct it necessary, Immediately after this, check
the sensitivity and adjust it as necessary.
— Never calibrate the sensitivity before calibrating the zero point.
— Zero gas and test gas: see the information in the sensor data sheet.
Test gas must not be inhaled. Risk to health! Care must be taken about the
risks which can arise when using test gas; hazard instructions and safety advice
must be observed.
For details, see appropriate DIN Safety Data Sheets.
Open the front cover of the service port with an Allen key by turning anticlockwise
o
(approx. 60
). The maintenance switch and potentiometers for calibration are
now revealed.
Use only a 5 mm Allen key without a ball head.
The Dräger Polytron 3000 does not support the storage of calibration data in the
sensor data base.
Measuring / maintenance mode
1 Maintenance switch with two positions.
2 Measuring mode position (left-hand position) – measured values are relayed to
the analogue output.
3 Maintenance mode position (right-hand position) – a maintenance signal (3.4
mA ±0.2 mA constant) is relayed to the analogue output and prevents alarms
being triggered.
1)
EN 50073 – Guidelines for selection, installation, use and maintenance of devices for
the detection and measurement of flammable gases and oxygen.
2)
EN 45544-4 – Electrical devices for the direct detection and direct concentration
measurement of toxic gases and vapours – Part 4: Guidelines for selection, installa-
tion, use and maintenance.
14
CAUTION
1)
2)
, EN45544-4
CAUTION
CAUTION
NOTE
and national re-
Polytron
1
2
3
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