Honeywell Searchline Excel Open-Path Technical Handbook page 54

MAN0530 Issue 09 October 03
2104M0506
3. INSTALLATION AND OPERATION
Contaminants
Assess the installation and its surrounds for sources of contaminants that could build up on the
unit 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.
Beam Obstruction/Blocks
Ideally, a clear path of at least 20cm diameter should be provided between the Transmitter and
the Receiver. Enter any obstructions which encroach into this path, e.g.
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.
Test Filter
After completing the installation procedure, enter the DISPLAY mode and test the gas detector
response with a plastic test filter. Enter the nominal value of the test filter, the unit s displayed
response and mark the Pass or Fail box.
The acceptable responses to test filters for different gas tables are detailed in section 5.1.2.
4 - 20mA Loop Integrity
Test the 4 - 20mA loop integrity by forcing the unit to output a known current and monitoring this
at the control room or with a multimeter inserted into the loop. Mark the appropriate box.
Fault/Warning Log
Check the fault/warning log. In order for the unit to complete installation satisfactorily, the ACTIVE
FAULTS log must be CLEAR. Use the Handheld Interrogator to diagnose and remedy all
ACTIVE FAULT.
Wherever possible, it is recommended to CLEAR any ACTIVE WARNINGS, since these may
lead to faults in the future.
Drilling mud spray,
Diesel generator exhaust
Process pipes,
Tree branches
Personnel in corridor,
Loading bay vehicles
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Searchline Excel