Maintenance - Honeywell Searchline Excel Open-Path Technical Handbook

MAN0530 Issue 09 October 03
2104M0506
4.6.1 Disconnecting the Handheld Interrogator
To finish the commissioning process:
(1) Select the Power Off option from the interrogator Main menu
(2) Press on the keypad
Alternatively, press the
Notes:
1. The SHC1 Handheld Interrogator powers down automatically after five minutes of inactivity
in order to preserve battery life.
2. The fast power off facility and auto power off are disabled when a menu option is selected
that modifies the unit's configuration.
(3) Disconnect the interrogator from the Excel gas detector, reversing the steps described in
section 3.7.6.

4.7 MAINTENANCE

The Cross-Duct Searchline Excel maintenance requirements are similar to those for the
Open-Path gas detector, see Chapter 5.
4.7.1 Cleaning
Cleaning procedures are similar to the Open-Path Excel but the beamsplitter in the mounting
cell and the retro-reflector may also require cleaning.
To access the Transmitter and Receiver windows, and the beamsplitter:
• Remove the top cover from the mounting cell.
The cover is retained by 3 x M4 captive bolts, and a chain attaches the lid to the mounting
cell when opened. There are no electrical hazards inside the mounting block and a hot
work permit is NOT required.
Note: It is strongly recommended that the Excel gas detector is inhibited (use the Handheld
Interrogator and select Calibrate, then Display) to prevent the unit signalling faults or
spurious gas readings which may be caused during cleaning.
To reduce the need for cleaning, it is possible to connect a supply of compressed air to the
Air Shield port on the mounting block (see diagram in section 4.7.2). The air shield port is the
one closest to the duct. By flowing clean air into the mounting cell (which then moves out into
the duct), the build up of contamination inside the mounting cell will be reduced. It is essential
that this air supply is oil and dirt free. Precautions such as a filter and a liquid trap should be
installed in the air-line.
4.7.2 Functional Testing
Cross-Duct Excel incorporates a built in gassing cell for functional test purposes. In order to
use the gassing cell, the mounting cell lid must be in place, to maintain a gas tight seal.
4. CROSS-DUCT EXCEL
and ESC keys simultaneously for a fast power off.
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Searchline Excel