Owner's Manual

GDC-350 Operation Manual
5909-9000 Rev 1 23
Therefore, in this example, the required voltage setting to achieve an alarm set point
of 100 ppm is 2.0 VDC.
VOLTAGE REFERENCE TABLE FOR ALARM SETTINGS
SENSOR /
GAS
MEASUREMENT
RANGE
LOW ALARM
SET VOLTAGE
HIGH ALARM
SET VOLTAGE
CO 0-200 ppm 25 ppm / 0.50 VDC 100 ppm / 2.00 VDC
NO
2
0-10 ppm 0.7 ppm / 0.56 VDC 1.5 ppm / 1.20 VDC
O
2
0-25.0% Vol 19.5% Vol./ 3.12 VDC 23.0% Vol. / 3.68 VDC
NO 0-100 ppm 25 ppm / 1.00 VDC 50 ppm / 2.00 VDC
SO
2
0-20 ppm 2 ppm / 0.40 VDC 5 ppm / 1.00 VDC
Combustibles 0-50% LEL 20% LEL / 1.60 VDC 40% LEL / 3.20 VDC
Refrigerant
Gases
(R series)
0-2000 ppm 500 ppm / 1.00 VDC 1000 ppm / 2.00 VDC
4.6. Relay Time Delays
The GDC-350 offers a wide range of time delay settings that are user configurable. If
the GDC-350 has been equipped with the LED digital display, read the values on the
display as you change them to suit your application. If the GDC-350 does not have a
digital display, you will need a volt meter. The voltage reference is 0-4 VDC.
Attach the volt meter leads to the two test points (TP1 and TP2) located just below the
high alarm relay (RLY2) on the main circuit board.