Maintenance Menu
Page 14 of 42
9023810 - 2nd edition - September 2005
Maintenance Menu
● To enter the maintenance menu press key l for more than 3 seconds until the
display shows “SL” and the point on the right bottom flashes to indicate the
maintenance mode.
SL – Set Output to x mA
By means of this function the transmitter’s output signals can be set to certain
constant values.
● Navigate by means of keys q or l until the display shows SL (“Set Loop“) and
press keys (
q+l) to enter.
— The signal output of the transmitter is set to 4 mA, the display shows “04“.
● By means of the keys q or l the signal output can be adjusted between 1 and
22 mA in steps of 1 mA. Pressing the keys for longer activates a repeat function.
● Press keys (q+l) to terminate this function. The display shows SL again.
● Press key q to step back into measurement mode.
CL – Calibration of Output Signal
By means of this function the signal output of the transmitter can be adjusted such
that a current of 4 mA corresponds to 0 % LEL and a current of 20 mA corresponds
to 100 % LEL or 10 % LEL.
Generally the output signal can be measured at the controller side as voltage drop
across the input resistance, if not the 4 to 20 mA-loop has to be interrupted to install
an amp meter fort his purpose.
● Navigate by means of keys q or l until the display shows CL (“Calibrate Loop“).
● Press keys (q+l) to adjust the lower reference point, the display shows “04“ cor-
responding to 4 mA.
● Measure the current by means of the amp meter.
● By means of the keys q or l adjust the signal output such that the amp meter
reads a current of 4 mA as accurate as possible (between 3.95 toand 4.05 mA).
● Press keys (q+l). By this the lower reference point is saved and the menu swit-
ches over to the upper reference point. The display shows “20“ corresponding to
20 mA.
● Measure the current by means of the amp meter.
● By means of the keys q or l adjust the signal output such that the amp meter
reads a current of 20 mA as accurate as possible (between 19.95 and to
20.05 mA). Pressing the keys for longer activates a repeat function.
● Press keys (q+l) to save the upper reference point and terminate this function.
The display shows CL again.
● Press key q twice to step back into measurement mode.
Attention:
This function can activate alarm conditions at controller unit!
Attention:
If the current loop is interrupted for this purpose the explosion protection is
not ensured!
00923810_1.eps01023810_1.eps
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