Spectrex SafEye Quasar 950, User And Maintenance Manual, Page: 29 / 72

Operating Modes
TM888300 Rev. (Al), August 2019 29
The source statuses are listed in Table 3.
Table 3: Source LED Indications
Source
Status
LED Color LED Mode
Fault Yellow 4Hz, flashing
Normal Green 1Hz, flashing
4.3 Output Signals
The SafEye system provides the following outputs:
• 0 – 20mA Current Output
• RS-485 Interface
4.3.1 0
–20mA Current Output
The 0 – 20mA output provides the detector status measurement with a continuous
reading of exact gas concentration.
The 0 – 20mA output functions as current Sink, but it can be configured as Source
(see).
The maximum permitted load resistance for the 0 – 20mA output is 500 Ω.
Table 4: Standard (default) 0 – 20mA Current for the Gas Channel
Current Reading Status and Description
0mA +0.2mA Fault in 0 – 20mA loop
1mA ±0.2mA Zero calibration (in progress), Fault 2
2mA ±0.2mA Fault 1 (non-critical)
3mA ±0.2mA Maintenance call
4mA ±0.2mA No gas present
4 – 20mA Continuous measuring of gas concentration at a
range between 0
– 500ppm.m or full scale
21mA Concentration is over the range limit (more than
full-scale concentration)
4.3.2 RS-485 Interface
The detector has an RS-485 Modbus-compatible input/output that can send data
communication to a PC loaded with the appropriate host software, and receive
data or control commands from the PC.