18
System Example
LPG
0-100%LEL
SN:20235-1-1 ADD:4110
GAS DETECTOR
LPG
0-100%LEL
SN:20235-1-1 ADD:4110
GAS DETECTOR
Typically 1.5mmSQ
24V L1,L2
Unscreened Cable
2 Core Highway as:
Controller in Supervisors Office
ATEX Zoned Area
Mix Annunciators With Other
Addressable Devices Such as
TOC-750 Series Detectors.
Use ATEX Rated detectors
where required
Use Annunciators For Door
Entry Control.
Use Annunciators with Gas
Detector Interfaces to Detect
& Alarm in Specific Areas
Use the Detector or
Annunciator I/O
Capability to Control
Gas Supply Valves,
Beacon-Sounders or
other devices
Laboratory
Gas Bottle Store
Addressable
2-Wire
Where Required For Longer Cable Runs
or Where Device and Accessory Density
is High add Power Boosters or Cascade
Hubs to Increase Distance Capability to
up to 3KM
Cabling: When using stranded cable fit bootlace ferrules to
prevent stray wire strands shorting.
Cable glands must be used for cable entries.
Summary of Contents for 2-Wire Systems
Page 4: ...3 SECTION 1 MOUNTING DETAILS FOR EQUIPMENT...
Page 9: ...8 SECTION 2 SITING GAS DETECTORS...
Page 16: ...15 SECTION 3 GENERAL CABLING PRINCIPLES CABLE TYPES AND CABLE SIZING...
Page 23: ...22 SECTION 4 MAKING DEVICE CONNECTIONS TO DETECTOR NODES...
Page 35: ...34 SECTION 4 Control Panel Interfaces and Connections...
Page 51: ...50 Notes...