9023810 - 2nd edition - September 2005
Page 19 of 42
Calibrating transmitter
— If after sensitivity adjustment of the type XTR 0010 by means of 4.4 % LEL
ethanol a reference value of 32 is displayed, so the true sensitivity of the Ex-
sensor LC M for ethanol is 32
*
2 / 10 = 6,4 mV/% LEL. This value is 5-fold
higher than with the Ex-sensor PR M because of the internal amplification of
the Ex-sensor LC M.
● The reference value and/or the true sensor sensitivity should be recorded for test
purposes.
● Press keys (q+l) to exit this function.
● Press key q twice to switch back to the measurement mode. The flashing point
on the right bottom is deactivated.
Following completion of calibration:
— The display shows the current gas concentration in % LEL and the transmitter’s
4 to 20 mA-output is proportional to the current gas concentration in % LEL.
Remark:
If the reference value is less than half value recorded during commissioning or
if the measured value does not stabilise within 3 minutes, the sensor is defec-
tive and should be replaced (see page 22).
● Observe the atmosphere is free of dust and re-install the upper section of the
housing by means of the four screws..
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