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MAN0530 Issue 15 - 07/17
2104M0506
The Searchline Excel Open-Path Gas Detector requires little maintenance other than occasional
cleaning.
Depending on the local regulations and site conditions, cleaning and functional testing of the
gas detector can be carried as described in the following sub-sections. The gas detector should
remain powered during these procedures.
Caution: Searchline Excel does not contain any user serviceable parts. Do not open
either the Transmitter or Receiver unit. The warranty of units which have been
opened is invalidated.
NOTE:
THE INFRARED BEAM IS INVISIBLE AND EYE SAFE.
4.1 INSPECTION AND CLEANING
Caution: Do not use solvents or abrasives on the Searchline Excel units.
(1)
Inspect the Searchline Excel units, junction box and cabling for signs of physical
damage.
(2)
Using the SHC1 Handheld Interrogator inhibit the Searchline Excel signal output.
Since the signal output may vary during cleaning, due to the optical path being disturbed,
it is important to inhibit the analogue output. The quickest way to inhibit the Excel output
is to select DISPLAY from the Calibration menu.
(3)
Clean any dust or dirt from the Searchline Excel windows using soapy water and a soft
cloth.
(4)
Using the SHC1 Handheld Interrogator release the Searchline Excel signal output.
The output can be released by pressing ESC followed by
(5)
Using the SHC1 Handheld Interrogator re-zero the unit.
See Appendix A for details about how to use the Interrogator.
4.2 SEARCHLINE EXCEL: PLASTIC FUNCTIONAL TEST FILTERS –
OPEN PATH
These filters have been specifically designed to work with open-path Excel units of Mod state
7 or higher.
4.2.1 Functional Testing of Open Path Searchline Excel Units
Note: Refer to the test sheet that was supplied with the Searchline Excel receiver for the original filter and response measured by the fac-
tory. Wherever possible this should be used as a reference for all subsequent tests.
Test Searchline Excel units using the kit of functional test filters as follows:
(1)
Ensure the area is gas free.
(2)
Connect the SHC-1 Handheld Interrogator (see section 3.7.5) to the unit to be tested.
(3)
Select DISPLAY from the Calibration menu.
(4)
Slide a suitable functional test filter (see table below) into the cowling at the front of the
receiver. This table shows the typical responses that can be expected for these filters.
4. MAINTENANCE
58
Searchline Excel
on the keyboard.
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