Honeywell SEARCHLINE EXCEL PLUS Technical Manual page 49

Recommendations
Briefly describe the recommended actions which need to be performed in order to make the installation satisfactory, e.g.
• Mounting pole requires bracing/stiffening,
• Pipes obscuring beam to be moved, or transmitter/receiver relocated,
• Provide correct supply voltage.
1. Mount Rigidity
Check that the instruments have been mounted securely to the supporting structure. Check that the supporting structure
is sufficiently rigid to maintain alignment in the anticipated operating conditions. A maximum angular movement of ±0.5°
is allowable.
As an approximate guideline, a sufficiently rigid mount/supporting structure will only move a few millimetres (not more
than ±6 mm) when leaning body weight against it. When pushed hard and released, the mount/supporting structure should
return quickly to its original position and should not wobble or sway. If the mount/support is unacceptable, briefly describe
the problem, e.g., Mount wobbles unacceptably, Mounting pole too thin.
2. Vibration
Check the installation and its close surrounds for potential or existing sources of excessive vibration. Such sources could
include heavy plant/machinery, turbines, generators etc.
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/Frost.
Check the installation and its surrounds for potential sources of excessive heat. Consider measures to be taken if frost
build-up is very likely. The instrument is specified to range between -60 °C/+65 °C (-76 °F/+140 °F). Excessive heat may
include direct sunlight in hot climates, flare-stacks, generator/turbine exhausts and steam vents. Excessive frost build-up
commonly occurs in very cold climates. Enter a brief description, e.g. Direct sun, Kuwait, Flare-stack 2 metres away;
or Winter anti-cyclone, Siberia; or Winter storm, Iceland.
3. Supply Voltage
Check that the supply voltage applied to the instrument is within the specified 18 V to 32 V range and is stable.
Enter the supply voltage and stability, e.g. 22.5 V, stable, 19 V, ±2 V fluctuation.
4. Earthing
Inspect the earth connections to the instruments. If the instrument is connected to local metalwork or the safety/general
use earth, enter Local Safety. If the instrument has been isolated from local metalwork/earth and is connected to a clean,
instrument earth, enter Instrument earth (refer to Chapter 6.2.7 Earthing recommendations).
5. RFI/EMC
Assess the installation, cabling and its close surrounds for known/potential sources of excessive Radio Frequency
Interference/Electromagnetic Interference (RFI/EMI. Such sources could include radio/radar transmission antennae,
high voltage switch-gear, large electrical generators/motors etc.
Searchline Excel Plus & Searchline Excel Edge is extremely immune to RFI/EMI, complying with the most stringent
requirements specified in EN50270. Precautions should be taken to avoid interference on the field cabling and
connections, in turn to avoid affected reading received at the control room.
Enter brief details of known/potential RFI/EMI sources that are within five metres of the transmitter/receiver and/or
its cabling. If cable is unscreened or inadequately protected, note concerns. Examples of the sort of information to enter are:
10 m cable, unscreened; Radar, 2 m from the receiver; Cable routed over 400 kW generator.
6. Contaminants
Assess the installation and its surrounds for sources of contaminants that could build up on the instrument's windows.
Such contaminants could include oil mist, heavy sea spray, drilling mud, dirty exhaust fumes, wave splash, etc.
If there is a realistic possibility that such contaminants could cause a significant problem, enter a brief description,
e.g., Drilling mud spray, Diesel generator exhaust.
7. Beam Obstruction/Blocks
Ideally, a clear path of at least 20 cm diameter should be provided between the transmitter and the receiver. Enter any
obstructions which encroach into this path, e.g. Process pipes, Tree branches.
Assess the installation and the beam path for potential sources of beam blockage. These could include personnel walking
in the beam, parking vehicles, moving machinery/plant, growing vegetation etc.
If there is a realistic possibility that they could cause a significant problem, enter a brief description,
e.g., Personnel in corridor, Loading bay vehicles.
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
Chapter 7 Alignment and Commissioning 49