Owner's Manual

GDX-350 Sensor Transmitter
14 P/N: 5600-9001 Rev 2
1.7. Calibration Gas
Part Number Gas Name Chemical Formula Concentration
0051-4000 Ammonia NH
3
25 PPM
0051-4028 Propane C
3
H
8
25% LEL
0051-4031 Methane CH
4
25% LEL
0051-4010 Carbon Dioxide CO
2
2.50%
0051-4052 Phosphine PH
3
1 PPM
0051-4040 Hydrogen H
2
100 PPM
0051-4048 Nitrogen Dioxide NO
2
5 PPM
0051-4075 Sulfur Dioxide SO
2
5 PPM
0051-4044 Hydrogen Sulfide H
2
S 25 PPM
0051-4049 Oxygen O
2
20.9%
0051-4025 Carbon Monoxide CO 100 PPM
1.8. System Design Specifications
Category System Design Specification
Supply Voltage
10 to 30 volts
Power
Consumption
• With a typical 0.5 watt Bridge Sensor: 100 mA @ nominal 24 VDC
• Relays/RS-485 Modbus Option Board: 40 mA per relay (120 mA total with all 3
energized); RS-485 use adds 20 mA
Memory
Non-volatile E2 memory retains configuration values on power outages.
Loop
Resistance
750 ohms maximum (at nominal 24 VDC power)
Relays
(Optional)
Three configurable form C (SPDT) relays rated for 5 amp at 30 VDC or 240 VAC
RESISTIVE
Relay 1 and Relay 2 level alarms may be configured for HIGH or LOW trip, for
normally energized (Failsafe) or normally de-energized and for latching or non-
latching.
.
Relay 3 is always normally energized for failsafe operation; therefore, loss of
power to the GDX-350 will be indicated as a “FAULT” condition.
CAUTION: Relays are rated for RESISTIVE loads. Inductive loads, such as contactor coils
or motors may cause contact arcing, which emits RFI into the sensor signals. Use
appropriate snubbers and MOVs across inductive loads and keep wiring away from signal
wires.