Receiver - Honeywell Searchline Excel Technical Handbook

MAN0530 Issue 10 - 11/09
2104M0506
160mm (SR)
211 (MR/LR)
The Transmitter window is heated to minimise condensation, frosting and the build up of 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 wires which run through the protective,
flexible conduit. There are three Transmitter wires, red (+24V), black (0V) and greenIyellow
(GND).
2.3

RECEIVER

The Searchline Excel Receiver collects infrared radiation from the Transmitter and performs
measurements to enable hydrocarbon gases in the beam path to be detected.
Infrared radiation is collected by a single, silicon lens, which is common to both the sample and
reference measurement channels. This radiation is divided by a beamsplitter and fed to two
filtered detectors, sample and reference.
The sample detector input is filtered at wavelengths where strong infrared absorption is exhibited
by the target gas. The reference detector input is filtered at nearby wavelengths, where strong
infrared absorption is not exhibited by the target gas. By calculating the ratio of the sample to
reference signal it is possible to measure the quantity of gas in the beam, whilst compensating
for the effects of rain, fog, dirt etc.
2. OVERVIEW
10
417mm (SR)
433 (MR/LR)
Searchline Excel