Spectrex Quasar 900 Open-Path Gas Detection System - Manual (Page 23)

TM 888200 Rev (I), January 2014
Description 11
2.6.2 Detector Unit
The Detector receives the transmitted pulsed radiation signals from the
Flash Source. The signals are then amplified and fed into an analog to digital
signal converter to be processed by the internal microprocessor. When the
signals drop below a prescribed level, the internal microprocessor will
compensate for them. This will allow the signal to be maintained even in
severe weather conditions. The data is sent to the output interface section.
The front window of the Detector is heated to improve performance in icing,
condensation and snow conditions.
There is one detector type that is suitable for all Quasar models 901, 902,
903 and 904 – P/N QR-X-11X.
1 Front Window Section 7 Earth Terminal
2 Label 8 Front Window
3 Main Housing 9 Handheld Fast Connection
4 Mounting Plate 10 Cable Inlet
5 Junction Box 11
Indication Led
6 Back Cover
Figure 3: Detector