Spectrex Quasar 900 Open-Path Gas Detection System - Manual (Page 27)

TM 888200 Rev (I), January 2014
Visual Indicators 15
3.2 Visual Indicators
One 3-color LED indicator is located in the back side of the detector/source
and can be seen through the back cover window. See Figure 2 and
Figure 3, item 11.
The detector statuses are listed in Table 3.
Table 3: Detector LED Indications
Detector Status LED Color LED Mode
Fault Yellow 4Hz – flashing
Alignment / Standby Yellow 1Hz – flashing
Zero Calibration Yellow Constant
Normal Green 1Hz – flashing
Warning Red 2Hz – flashing
Alarm Red Steady
The source statuses are listed in Table 4.
Table 4: Source LED Indications
Source Status LED Color LED Mode
Fault Yellow 4Hz – flashing
Normal Green 1Hz – flashing
3.3 Output Signals
The SafEye system provides the following outputs:
 0-20mA Current Output, page 15
 RS-485 Interface, page 16
3.3.1 0-20mA Current Output
The 0-20mA output provides the detector status measurement showing a
continuous reading of exact gas concentration.
The 0-20mA functions as current sink, but it can be configured as Source
(see Appendix A).
The maximum permitted load resistance for the 0-20mA output is 600Ω.