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ED810 INSTRUCTION MANUAL 27-02-07 6
SENSORS
Type EDF 1B, 2B, 3B and 3Bfig are semiconductor elements housed in a certified flameproof
stainless steel housing. The housing has a male M32 thread which can be screwed into a
conduit or suitable junction box. The semiconductor sensors are available in the following
types:-
a) EDF1B flameproof.
Suitable for the detection of flammable gases such as Ammonia, Butane, Propane and
some toxic gases, for more gases see list available.
b) EDF2B flameproof.
Suitable for the detection of flammable gases such as Methane, Hydrogen and some
toxic gases, for more gases see list available.
c) EDF3B flameproof.
Suitable for the detection of most Freons such as R22.
d) EDF3B fig flameproof
Suitable for the detection of most Freons such as R11, R12, R143A, R134A etc.
The EDS/C IS Transmitter is a intrinsically safe junction box complete with head electronics
and electrochemical cell gas sensor suitable for the detection of various toxic gases. Many
different electrochemical cells are available and EDL should be consulted to advise on correct
sensor type.
The EDS/P IS Transmitter is a intrinsically safe junction box complete with head electronics
and catalytic (pellistor) gas sensor suitable for the detection of flammable gases. Contact
EDL for advice on correct sensor type.
Siting: The sensor heads should be placed lower than gas appliances when the gas to be
detected is heavier than air. If the gas is lighter than air then the sensors should be placed
above possible sources of leaks. Consideration should be given to the temperature of the gas
at the time during a leak, for example if a serious Ammonia leak occurs in a refrigeration
plant it can leak as a liquid and stay at floor level for some time even though Ammonia is
lighter than air. In this instance sensors at low and high levels are normally fitted.
Attention should be given to the probable gas flow in each particular installation to site the
sensors in the most advantagous position. In living quarters particular consideration should
be given to carbon monoxide, it is advisable that some of the sensors are mounted at head
height.
The sensors are sealed into their stainless steel enclosures and no attempt should be made to
open them on site, if necessary they should be returned to EDL for repair/servicing.
Unused sensor positions: When all of the sensor positions are not being used the spare
position should have the dip switches on the control PCB set to “standard sensors” and a
terminating resistor of 47KΩ fitted to avoid the fault lights and relay operating. This is
normally done before the unit leaves the factory as standard.