Spectrex Quasar 900 Open-Path Gas Detection System - Manual (Page 29)

TM 888200 Rev (I), January 2014
System Setup 17
3.4.2 Detection Setup Function
See Detector Default Setup, page 18 for default settings.
Setup includes the following options:
 Gas Calibration, page 17
 Zero Calibration, page 17
 Address Setup, page 17
 Heated Optic Operation, page 17
3.4.2.1 Gas Calibration
Three gas types can be selected for maximum compatibility to the required
measured gas(es).
Gas Types:
 Methane – full scale 5 LEL.m.
 Propane – full scale 5 LEL.m.
 Ethylene – full scale 8 LEL.m.
These three calibrations are standard calibrations.
3.4.2.2 Zero Calibration
 Enable – Zero calibration is performed according to background
 Disable – The Detectors are not updated due to change of background
3.4.2.3 Address Setup
The Detector provides up to 247 addresses that can be used in RS-485
communication link.
3.4.2.4 Heated Optic Operation
The heated optics for the Detector unit can be defined as one of the
following modes:
 OFF -Not operated
 ON -Operated continuously
 AUTO - On, per temperature change (default)
When operated per temperature change, the user can define the start
temperature below which the window will be heated between 0 to 50°C. The
Detector will stop heating the window when the temperature will be 15°C
above the defined temperature.
This feature relates to the Detector only.
The Source heated optic must be defined with the order in two options:
 Heated continuously.
 Start heating below 41°F (5°C). (default)