52
MAN0530 Issue 10 - 11/09 Searchline Excel
2104M0506
If there is the possibility that such vibration sources could or are causing unacceptable
movement,
enter a brief description, e.g.
Turbine nearby,
Below conveyor
Excess Heat
Check the installation and its surrounds for potential sources of excessive heat. The unit is
speciedupto+65
o
C. Potential sources of excessive heat include direct sunlight in hot
climates,are-stacks,generator/turbineexhaustsandsteamvents.
Enter a brief description, e.g.
Direct sun, Kuwait,
Flare-stack 2 metres away
Supply Voltage
Checkthatthesupplyvoltageappliedtotheunitiswithinthespecied18Vto32Vrangeand
is stable. Enter the supply voltage and stability, e.g.
22.5V, stable,
19V, ±2V uctuation
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
requirementsspeciedinEN50270.Itisthereforemorelikelythattheeldcablingwillpick
up interference directly on the 4 - 20mA and 0V connections and that this will affect the
reading received at the control room.
Enterbriefdetailsofknown/potentialEMIsourcesthatarewithinvemetresofthegas
detector and/or its cabling. If cable is unscreened or inadequately protected, note concerns.
Examples of the sort of information to enter are:
10m cable, unscreened, Radar, 2m from Receiver,
Cable routed over 400kW generator
(See section 3.3 Electrical Connections).
3. INSTALLATION AND OPERATION
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