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Model 2350 / 2360 Gas Monitor (3/99)
Instruction Manual
Page:
Figure 1.3
Models 2350, 2360 Mechanical
1.2.2. ALARM RELAYS
There are five alarm relays (Note: Combustible Gas relay is not installed on Model 2350-00). All are single-pole double-
throw with 6 amp dry non-inductive contacts at 120/240 volts AC.
• FAILURE RELAY: The failure relay is activated when either gas sensor becomes defective (open sensor
resistance or no heater voltage). The failure relay is normally energized so it will also be activated if the -
48 VDC power fails.
• CARBON MONOXIDE RELAY: The Carbon Monoxide Relay is activated when the concentration ex-
ceeds the calibrated threshold setting (100 PPM CO).
• COMBUSTIBLE RELAY: The Methane Relay is activated when the concentration of Methane exceeds
the calibrated threshold setting (5000 PPM CH
4
).
• VENTILATION RELAY: The Ventilation Relay is activated when either the CO or CH
4
gas concentra-
tion exceed their calibration levels. The common contact of the ventilation relay is fused with a 4 amp
socketed micro-fuse.
• REMOTE INDICATOR RELAY: The Remote Indicator Relay is activated when either the Failure
Relay or the Ventilation Relay is activated. Any of the following conditions will activate the Remote
Indicator Relay.
* Excess Carbon Monoxide
* Excess Methane ( Model 2360 only)
* Loss of -48 VDC
* Carbon Monoxide sensor failure
* Methane sensor failure ( Model 2360 only)
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