Spectrex Quasar 900 Open-Path Gas Detection System - Manual (Page 31)

General Specifications 19
4 Technical Specifications
➣ In this chapter…
General Specifications page 19
Electrical Specifications page 20
Mechanical Specifications page 21
Environmental Specifications page 22
4.1 General Specifications
Detected Gases: Simultaneous detection of C1-C8
flammable gases
Detection Distance range: Table 8
Table 8: Detection Distance Range
Model
No.
Detector Source
Min.
Installation
Distance
Max.
Installation
Distance
901 QR-X-11X QT-X-11X 23 ft (7 m) 66 ft (20 m)
902 QR-X-11X QT-X-21X 50 ft (15 m) 132 ft (40 m)
903 QR-X-11X QT-X-31X 115 ft (35 m) 330 ft (100m)
904 QR-X-11X QT-X-41X 265 ft (80 m) 660 ft (200m)
Response Time: 3 sec to T90
Spectral Response: 2.0 - 3.0 micron
Sensitivity Range: Full
Scale
LEL.m.
Warning
LEL.m. Alarm
LEL.m.
Gas 1 Methane 5 1 3
Gas 2 Propane 5 1 3
Gas 3 Ethylene 8 1.6 4.8
Field of View:
Line of Sight
Alignment
Tolerance: ± 0.5°
Drift: ± 7.5% of the reading or ±4% of the full scale
(whichever is greater)
Minimum Detectable
Level:
0.15 LEL.m
Temperature Range: -67°F (-55°C) to +149°F (+65°C)