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Maintenance; Replacing The Sensor - Dräger PEX 3000 Gebrauchsanweisung

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Maintenance

6
Maintenance
6.1
Maintenance
Comply with EN 60079-29-2 and the relevant national laws and regulations.
Daily
Visual inspection to establish operational readiness.
During commissioning
Check the zero-point and span calibration (see "Calibrating the zero-point",
page 39).
Check the signal transmission to the controller and alarm triggering.
At regular intervals,
as specified by those responsible for the gas detection system, and not
exceeding an interval of 6 months:
Check the zero-point and span calibration (see "Calibrating the zero-point",
page 39).
Check the signal transmission to the controller and the triggering of the
alarms (SL function – set the current output to X mA, (see "SL – set current
output to X mA", page 36)).
In particular, regular checks must be performed to ensure that the sensor's
sinter disc is in a condition that does not impair the gas infeed due to corrosion
or deposits (dust, oil, aerosol).
Every six months
Inspection by specialists.
The inspection intervals must be established in each individual case, depending
on technical safety considerations, engineering conditions, and the technical
requirements of the equipment. We recommend that a service contract be
obtained with Dräger and that all repairs also be carried out by them.
If necessary
Replace sensor (see "Replacing the sensor", page 42).
6.2

Replacing the sensor

Only use sensors which are listed in the order list on page 27. Type XTR 0000,
XTR 0001: DrägerSensor PR M DQ, order number 68 12 220, type XTR 0010,
XTR 0011: DrägerSensor LC M, order number 68 10 350.
WARNING
The transmitter must be de-energised before replacing the sensor. Otherwise
explosion protection and the integrity of the sensor are not ensured, as this
might be damaged during live connection.
Observe the national regulations for the installation of electrical apparatus in
explosion-hazard areas (in Europe EN 60 079-14).
Disconnect the transmitter from the power supply or remove the controller's
channel card from the rack.
Loosen four screws on the top of the transmitter and remove the upper part
of the housing.
Disconnect the sensor lines from the connection terminals. Use a
screwdriver (width of 3 mm) or special tool to open the spring terminals (see
"Handling the spring terminal clamps in the transmitter", page 34).
Unscrew the hexagon nut from the old ex-sensor.
Remove the old ex-sensor from the housing and replace with a new ex-
sensor. Shorten the sensor cables on the new sensor to 55 mm, strip
approx. 6 mm and apply the isolated ferrules provided (Zoller+Fröhlich,
type: V3AE0003 or equivalent). This ensures that the degree of protection
IP 30 is preserved if the housing is opened for maintenance purposes.
Screw the new sensor into the hexagon nut (via the housing opening) and
fasten with thread-locking fluid (e.g. Loctite no. 221). To preserve the IP
degree of protection, ensure the flawless fit of the sensor sealing ring.
Connect the ex-sensor's cables (brown, yellow, black) to the corresponding
br/br, ge/yw and sw/bk terminal. Use a screwdriver (width of 3 mm) or
special tool to open the spring terminals (see "Handling the spring terminal
clamps in the transmitter", page 34).
Refit the upper part of the housing, ensuring that the atmosphere is free of
dust and fasten the cover screws.
Turn the transmitter on again and/or re-insert the controller's channel card
into the rack.
Observe the warm-up time of the new ex-sensor of about 10 minutes.
Dräger PEX 3000

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