GDC-350 Operation Manual
5909-9000 Rev 1
21
4.5. Adjusting Alarm Setpoints
The GDC-350 is configurable as a single or dual channel detector as such there are
two ascending gas alarm set points and two descending gas alarm set points. Almost
all installations of the GDC-350 will use the factory default alarm set points. Default
set points are as follows.
SENSOR
LOW ALARM
HIGH ALARM
RANGE
Caron Monoxide (CO)
25 ppm
100 ppm
200 ppm
Nitric Oxide (NO)
35 ppm
50 ppm
100 ppm
Nitrogen Dioxide (NO
2
)
0.7 ppm
1.5 ppm
10 ppm
Sulfur Dioxide (SO
2
)
1.0 ppm
5.0 ppm
20 ppm
Propane (C
3
H
8
)
10% LEL
20% LEL
50% LEL
Methane (CH
4
)
10% LEL
20% LEL
50% LEL
Refrigerants
500 ppm
1000 ppm
2000 ppm
Temperature °C
30 °C
40 °C
60 °C
Temperature °F
75 °F
90 °F
100 °F
If the GDC-350 has been equipped with an LED digital display, set values according
to what is displayed. If the GDC-350 does not have a digital display, you will need to
attach volt meter leads to the two test points (TP1 and TP2) located just below the
high alarm relay (RLY2) on the main circuit board.
Figure 4-3. Locations of Test Points TP1 and TP2
Move the jumper on the lower bank (J6) from its resting position (P1) and place it on
the appropriate jumper position as indicated in the table on the previous page. Next,
move the J7 jumper from its resting position to the desired position. Then use the UP
or DOWN push-buttons to set the desired alarm value.
To make additional changes to the sensor selected via J6, repeat the following steps:
x
move J7 to the appropriate position
x
use the UP or DOWN push-buttons to set the desired alarm value.