Dräger PIR 3000, Инструкция по эксплуатации

Страница: 15 / 64

15
Operational Characteristics
Manual Span Calibration of the Output Signal.
The span calibration of the gas transmitter is only possible under the following
conditions:
— The last zero calibration of the device was less than one hour ago.
— The span gas concentration is sufficiently high to effect a display on the device
of at least approx. 20 %LEL.
 Deactivate alarm activation of the central device.
1 Use calibration adapter to expose gas transmitter to test gas and wait until mea-
surement 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 5 seconds. The output
signal of the gas transmitter changes to the display of the span gas signal
(3 mA).
3 Remove the magnetic pin. The output signal of the gas transmitter moves back
to the normally displayed value. The device is now set to span calibration routine.
While in this routine, the display will decrease resp. increase, depending on
whether the magnetic pin is placed on either of the areas marked by the " "
or " " icons.
4 Adjust the output signal by placing the magnetic pin on one of the areas marked
by the " " or " " icons.
5 Remove the magnetic pin. The device terminates the span calibration routine af-
ter 30 seconds without further changes being made and saves the new calibra-
tion parameter. The output signal momentarily switches back to the span gas
signal display to confirm a successful calibration.
6 Stop the exposure to gas, then wait for the display to fall back to zero.
 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
00623812_01.eps
S
0
S
0
S
01023974_02_en.eps
S
S 0
time
display
–6.25 %LEL
(3 mA)
test gas concentration
0
I (1) I (2) I (3) I (4) I (5) I (6)