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Maintenance
Unit calibration
Caution:
— When the transmitter is installed in Ex areas zone 22 or Class II, Div. 1 & 2,
Group E, F, G the opening of the housing (required for calibration) must not
be done when connected to power (power must be turned off or the area
has to be 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 accord-
ance with the recommendations in EN 50073
lations.
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.
Caution:
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.
Attention!
Use only a 5 mm Allen key without a ball head.
Note:
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 measure-
ment of toxic gases and vapours – Part 4: Guidelines for selection, installation, use and
maintenance.
14
1)
2)
, EN45544-4
and national regu-
Polytron
1
2
3
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