3
System Overview
The GasVac 311 system is designed to monitor gas levels in situations where the positioning of
conventional gas sensors may not be practical. This may be due to equipment security, cable
routing, access for detector head installation/maintenance, or harsh environment, or a cost effective
means of monitoring plant rooms, supermarkets, cool stores and designated hazardous areas,
such as tunnels, marine applications, or underground/high level voids.
A gas sample is continuously extracted via a unique micropore sample technique having a
minimum of two and maximum of 30 intake modules along its sample line network. The sampling
unit provides a gas level reading with three alarm trip points, and a range of signal outputs for
annunciator or control functions.
The system is supplied factory programmed and pre-calibrated to enable immediate operation
by connection of a power supply and attachment of the sample line and its intake module network.
OUT
IN
Sample
1
2
3
Power
Alarm 3
Alarm 2
Alarm 1
Fault
Inhibit
Gas Alarm
GasVac
Fig 1
1
2
Typical Arrangement
Intake
modules
OUT
OUT
IN
1
Sensor sample out
→
1 litre / min
2
Draw pump out
→
3 litre / min
