Dräger PIR 3000, Instructions For Use Manual

Page: 14 / 64

Operational Characteristics
14
Manual Zero Calibration of the Output Signal.
 Deactivate alarm activation of the central device.
1 Expose the gas transmitter to nitrogen, synthetic air, and/or fresh air via calibra-
tion adapter and wait until measurement value stabilises.
2 Place the magnetic pin onto the transmitter surface area marked by the " "
icon and hold it there (within the black frame) for at least five seconds. After five
seconds, the output signal of the gas transmitter switches to the display of the
span gas signal (3 mA) for as long as the magnetic pin is held against it. At the
same time, a zerosetting of the optical measuring unit is carried out automatical-
ly.
3 Remove the magnetic pin. The output signal of the gas transmitter moves back
to the previously displayed value. The device is now set to zero point calibration
routine. Within this routine, the output signal will decrease resp. increase, depen-
ding on whether the magnetic pin is placed on one of the areas marked with eit-
her the " " or the " " icon.
4 Adjust the zero point signal by placing the magnetic pin on one of the areas mar-
ked with either the " " or the " " icon.
5 Remove the magnetic pin. The device terminates the zero point calibration rou-
tine after 30 seconds without further settings being carried out. As confirmation
of the successful calibration, the output signal changes back to the span gas si-
gnal (3 mA). This signal is indicated for the same period of time as when starting
the zerosetting calibration routine.
6 Terminate exposure to gas.
 Reactivate alarm activation of the central device.
NOTICE
The calibration is automatically terminated and new calibration parameters are not saved if the gas concentration measured
by the gas transmitter changes during the calibration procedure (e.g. because the calibration gas cylinder fell empty during
the calibration procedure). In this case, the gas transmitter returns to normal operation without displaying the span gas signal
as confirmation.
0
S
00823812_01.eps
0
0 S
0 S
00923974_02_en.eps
S 0 0
time
display
–6.25 %LEL
(3 mA)
0
I (1) I (2) I (3) I (4) I (5) I (6)