9023810 - 2nd edition - September 2005
Page 17 of 42
Calibrating transmitter
Calibrating transmitter
For this chapter:
— Mentioning Type XTR 0000 also includes type XTR 0001 as well as the transmit-
ters type XTR 0090 or XTR 0091 with remote sensing head SE Ex PR M
(100 % LEL).
— Mentioning Type XTR 0010 also includes type XTR 0011 as well as the transmit-
ters type XTR 0090 or XTR 0091 with remote sensing head SE Ex LC M
(10 % LEL).
Zero point adjustment
To enter the calibration menu press the key l for more than one second but less
than 3 seconds. The display shows a flashing point on the right bottom indicating the
calibration mode.
● Navigate by means of keys q or l until the display shows ZE (“ZEro“) and enter
the menu by pressing the keys (
q+l). The output signal is set to 3.4 mA to signal
the calibration procedure mode to the controller unit.
● Apply zero gas to the sensor –
without calibration adapter:
Ensure that the transmitter is in clean ambient surroundings (no flammable gases
or vapours present),
or
with calibration adapter:
Supply clean air at a flow rate of approx. 0.5 L/min via the calibration adapter.
— The transmitter’s display shows the currently measured gas concentration which
in general is slightly different from zero. Negative values down to “–9“ % LEL or
“–.9“ (type XTR 0010) are displayed.
● Wait until the reading has stabilised (max. 3 minutes) and press keys (q+l). By
this the current sensor signal is converted into an up-dated zero point also shown
on the display (ideally "0“).
● Press keys (q+l) to save the up-dated zero point and to terminate the zero adju-
stment function.
● Press keys (q+l) to exit this function. The display shows ZE again.
● Press key q to switch back to the measurement mode or press key l to perform
the sensitivity adjustment.
Remark:
After a sensor replacement the zero point might be misaligned so much
that the display shows “--“. In this case press keys (
q+l) to save prelimi-
nary zero and again follow the above zero adjustment procedure.
01423810_1.eps
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