STATUS SCIENTIFIC CONTROLS
FGD3 Infrared Gas Detector Heads
TD06/024
Issue:
7
Change Note:
1904
Page 18
5.2.3
C: 3 - Select FSD
Menu mode
C: 3
This option should only be used after advice from Status Scientific Controls.
Changing this value will affect the 4 to 20mA output and possibly make the FGD3
unsuitable for its intended use.
5.2.4
C: 4 - Set 4mA Loop Current
This is a calibration feature. It allows the instrument to simulate a condition of zero gas
so that the 4mA output can be set.
•
Attach a multimeter (set to measure DC voltage) between test points TP1
and TP2.
•
Select menu mode
C: 4
(refer to section 5.2) and press ENTER.
•
Using the UP and DOWN buttons, adjust the reading displayed on the
multimeter to 40mV ±0.5mV
•
Press ENTER to store the 4mA calibration data. Pressing MENU instead of
ENTER aborts the feature.
•
Press MENU
– the display will show the DAC 4mA calibration factor for the
instrument before returning to its standard mode of operation.
5.2.5
C: 5 - Set 20mA Loop Current
This is a calibration feature. It allows the instrument to simulate a condition of full-scale
gas so that the 20mA output can be set. A control unit connected will indicate full-scale
gas also and may enter its alarm state.
•
Attach a multimeter (set to measure DC voltage) between test points TP1
and TP2.
•
Select menu mode
C: 5
(refer to section 5.2) and press ENTER.
•
Using the UP and DOWN buttons, adjust the reading displayed on the
multimeter to 200mV ±0.5mV
•
Press ENTER. Pressing MENU instead of ENTER aborts the feature.
•
Press MENU
– the display will show the DAC 20mA calibration factor for the
instrument before returning to its standard mode of operation.
Summary of Contents for FGD 3 Series
Page 2: ......
