13Chapter 3 Overview
Searchline Excel™ Plus / Searchline Excel™ Edge – Technical Manual
The transmitter window is heated in a controlled manner to minimise condensation, frosting and the build-up of ice and
snow. During particularly cold operating conditions, the heating of the transmitter window is increased to turbo levels.
The turbo mode can be disabled if not required.
Electrical connections to the transmitter are made via a separate Ex de wiring compartment. The wiring diagram is shown in
Chapter 6 Electrical Installation.
3.10Receiver
The Searchline Excel receiver collects the infrared beam from the transmitter and performs advanced measurements to
enable the hydrocarbon gases in the beam path to be detected and measured.
The receiver window is heated to minimize condensation, frosting and the build-up of snow. The level of heating applied is
controlled by the micro-controller and is adjusted from zero to maximum depending on the window temperature.
The primary output of the receiver is a signal in the range 420mA and is available as source or sink, 3 or 4 wire options.
For most applications, the output is calibrated for a range of 0 to 5 LEL.m (ppm is also available).
The receiver can communicate using the HART protocol, which provides digital communication superimposed on
the standard analogue output.
The receiver provides a facility for Modbus digital communication between the receiver and an external controller.
The receiver also features a Bluetooth interface that allows non-intrusive remote connection using a suitable mobile device
running the Honeywell Fixed Platform App.
3.11Mounting Accessories and Flexibility
The Searchline Plus & Edge Excel detector is supplied with a Universal Mounting Bracket as standard that can be simply
installed prior to the fitting of the instrument. The Universal Mounting Bracket allows simple fixing onto a wide range of
surfaces as well as poles, struts, plates and other plant infrastructure. It is manufactured from high quality Stainless Steel.
The 3-axis adjustment and fine adjustment allows the transmitter and receiver pair to be precisely aimed for accurate
coaxial alignment.
• Adjustment range in the vertical axis (A) = 0° to 90°
• Adjustment range in the horizontal axis (B) = 45° to +45°
• Adjustment rotational range (C) = 45° to +45°
• Basic graduated adjustment in 5 degree steps
• Graticule for easy setting
C
B
A
C
Figure 2.Adjustment ranges
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