Dräger PEX 3000 Manual Del Usuario página 40

en |
Maintenance
Error code Cause
E6 Error during sensitivity
calibration (e.g. sensor
sensitivity
<0.08 mV/%LEL)
E7 Error while calibrating
the 4 to 20 mA output
signal
E8 System error
If it is not possible to eliminate the faults by employing the remedial measures
described, or if other faults occur, the transmitter must be checked by
specialists and repaired, if necessary.
7 Maintenance
7.1 Maintenance
Comply with EN 60079-29-2 and the relevant national laws and regulations.
Daily
– Visual inspection to establish operational readiness.
During commissioning
– Perform zero-point and sensitivity adjustment.
– 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:
– Perform zero-point and sensitivity adjustment.
– 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 31)).
40
In particular, regular checks must be performed to ensure that the sensor's gas
Remedy
inlet is in a condition that does not impair the gas infeed due to corrosion or
deposits (dust, oil, aerosol).
Repeat the procedure,
check the test gas and
Every six months
sensor and replace sen-
sor, if necessary. – Inspection by specialists.
The inspection intervals must be established in each individual case, depending
Repeat calibration,
on technical safety considerations, engineering conditions, and the technical
check the measurement
requirements of the equipment. We recommend that a service contract be
setup for errors.
obtained with Dräger and that all repairs also be carried out by them.
Replace 4 to 20 mA con-
verter module.
If necessary
– Replacing the sensor.
7.2
Only use sensors which are listed in the order list. Type XTR 0000, XTR 0001:
DrägerSensor PR M DQ, order number 68 14 140, type XTR 0010, XTR 0011:
DrägerSensor LC M DD, 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 casing.
– 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 36).
– Unscrew the hexagon nut from the old ex-sensor.
Replacing the sensor
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