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MAN0530 Issue 10 - 11/09 Searchline Excel
2104M0506
Searchline Excel is a hydrocarbon gas detection system that is available in two versions:
• SearchlineExcelOpen-PathGasDetector
• SearchlineExcelCross-DuctGasDetector
For information regarding the Cross-Duct Excel contact Honeywell Analytics.
Searchline Excel Open-Path Gas Detector (OPGD) consists of a Transmitter unit that sends an
infraredbeamtoaReceiverunitupto200metresaway,andcanbelocatedwhereaammable
hydrocarbon gas cloud is likely to occur.
Thedetectoroperatesontheprincipleofinfrared(IR)absorption.Gasesabsorblightatspecic
wavelengths depending on their molecular composition. Hydrocarbon gases absorb in the
infrared region of the spectrum. If a cloud of hydrocarbon gas is present, part of the infrared
light is absorbed by the gas, causing a reduction in the signal received that is proportional to
the amount of gas in the beam.
The Searchline Excel Transmitter unit produces the infrared light, and the Receiver unit features
optical detectors and signal processing electronics. Each unit is housed in a robust stainless
steel housing. The Receiver produces a 4 - 20mA analogue output equivalent to 0 - 5 LEL.m
(Lower Explosive Limit metres) of gas.
NOTE: THE INFRARED BEAM IS INVISIBLE AND EYE SAFE
Searchline Excel is designed for use in the most demanding environments/applications and
provides a sensitive, fast and reliable response. The sophisticated open-path technology
provides immunity to sunlight and minimises the effects of environmental factors such as rain,
fog, ice, snow and condensation.
The Transmitter and Receiver units incorporate heated optics designed to minimise the build
up of humidity, condensation, snow or ice on the glass windows, that could obscure the optics
in extreme conditions.
The system is microprocessor controlled with integral self-diagnostics and fault nding
facilities.
Local communication between an operator/technician and the gas detector system is made
via an associated Handheld Interrogator that uses the Receiver’s inbuilt RS485 serial link.
The interrogator provides the user with a menu-style interface to select and invoke commands
for commissioning and configuring the system, and for viewing the system state and
measurements.
The interrogator is connected to the Receiver via one of Honeywell Analytics' DX/DVC100
(M) series types of Termination Unit, or via other types of junction box using the optional SHC
Protection Device. The DX/DVC100(M) Termination Units feature an active digital interface
that allows a remotely located control centre to monitor the gas detector's signal output and
perform basic commands using the Modbus Remote Terminal Unit (RTU) protocol over an
RS485 link.
1. INTRODUCTION
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