Honeywell Searchline Excel Open-Path Technical Handbook page 53

MAN0530 Issue 09 October 03
2104M0506
3. INSTALLATION AND OPERATION
If there is the possibility that such vibration sources could or are causing unacceptable movement,
enter a brief description, e.g.
Excess Heat
Check the installation and its surrounds for potential sources of excessive heat. The unit is
o
specified up to +65 C. Potential sources of excessive heat include direct sunlight in hot climates,
flare-stacks, generator/turbine exhausts and steam vents.
Enter a brief description, e.g.
Supply Voltage
Check that the supply voltage applied to the unit is within the specified 18V to 32V range and is
stable. Enter the supply voltage and stability, e.g.
Earthing
Inspect the earth connections to the units. If the unit is connected to local metalwork or the
safety/general use earth, enter 'Local Safety. If the unit has been isolated from local metalwork/
earths and is connected to a clean, instrument earth, enter Instrument earth. (See section 3.3,
Electrical Connections).
RFI/EMC
Assess the installation, cabling and its close surrounds for known/potential sources of excessive
RF/Electromagnetic Interference. Such sources could include radio/radar transmission antennae,
high voltage switch-gear, large electrical generators/motors etc.
Searchline Excel is extremely immune to RFI/EMI, complying with the most stringent
requirements specified in EN50082-2. It is therefore more likely that the field cabling will pick up
interference directly on the 4 - 20mA and 0V connections and that this will affect the reading
received at the control room.
Enter brief details of known/potential EMI sources that are within five metres of the gas detector
and/or its cabling. If cable is unscreened or inadequately protected, note concerns.
Examples of the sort of information to enter are:
(See section 3.3 Electrical Connections).
Turbine nearby,
Below conveyor
Direct sun, Kuwait,
Flare-stack 2 metres away
19V,
10m cable, unscreened, Radar, 2m from Receiver,
Cable routed over 400kW generator
22.5V, stable,
±
2V fluctuation
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Searchline Excel