Alarm Change Over relay (volt free)
Relay is normally ON, De-energising
on alarm condition.
NC
COM
NO
Power Supply:
Environmental:
Response Time:
Nominal Alarm Levels:
Expected Life:
Target Gas:
Standards Applied:
Cabling:
Service:
12 to 28V DC 4W
0 to +55 Degrees Centigrade
0-95%RH Non-condensing
Terminal Enclosure IP54 Cable Glands Must be used
<30 Seconds
See preset alarm levels Relay Active SPCO 5A @ 230V AC Non inductive
5 Years, no user replaceable parts
See cover markings as CO, CO2, O2, LPG, CH4
This equipment must only be serviced by competent persons and checked
periodically using traceable calibration gases. Do not test using lighter fuel or
similar fuel gases as this can give misleading results. In extreme cases this can
result in sensor damage.
EN50194-1:2009 Type A Equipment
When using stranded cable fit bootlace ferrules to
Prevent stray wire strands shorting
EN60335-1:2002 EN50270
Internal Terminal Functions
24V DC
0V DC
Installation of this device when connecting to a mains power supply should only be made by a competent
person. The unit is supplied pre-calibrated. Clean only using a damp cloth, DO NOT USE CLEANING
PRODUCTS.
Do not tamper with this equipment. To do so may cause incorrect operation or risk electric shock.
Connection for flammable gas detector
Connection for
O2/Toxic/IR gas detector
Connection Point for LED Module
Digital Output
(Sounder)
Digital Input
(Push Button)
Supply
Out
Supply
IN
NOTE: The unit is shipped configured and Pre-Calibrated for its detector and options and alarm levels
Internal Relay Active on alarm
Note relay is normally energised and
turns OFF on alarm.
Relay is mains rated to 5A and can be
used to control other 3rd party devices
(Flammable Gas Detectors)
Main Base PCB Connectors
When unplugging detectors from the main PCB DO NOT lever them off. This will potentially cause damage to the
PCB and/or connector mating parts and invalidate any warranty. If it is necessary to remove the PCB connectors use
long nose pliers.
+55 C
-10 C
Locating the Detector
The TOC-750 Flammable gas detector is factory calibrated for its target gas. The target gas is indicated on the
product (i.e CH4, LPG etc). The TOC-750 will respond to any flammable gas but can only be calibrated to be
correct response to one. The following list indicates common materials that may also cause a response in
operation:
Aerosol propellants (Butane)
Paint solvents (VOC’s)
Hot vaporised cooking oils
Solvent based adhesives (VOC’s)
Some commonly occurring substances may cause long term detector damage, typically:
Silicones (furniture polishes etc)
Hair sprays (silicones, VOC’s etc)
Chlorinated cleaning agents