Spectrex SafEye 300 Series, User Manual, Page: 25 / 80

Output Signals
TM794200 Rev Ad, March 2019 25
Table 4: Standard (Default) 4 – 20mA Current for the Gas Channel
Current Status and Description
0mA + 0.5mA Fault 2 or low voltage
2mA ± 0.5mA Fault 1
4mA ± 0.5mA Zero reading - no gas detected
4 – 20mA Continuous measuring of gas concentration at a range between
0 and 5 LEL*m or full scale
21mA Concentration is over the range limit (more than full scale
concentration).
Table 5: Discrete Reading of 4 – 20mA at Different Detector Modes
Current Reading Mode LEL*m Setting
301
0 + 0.5mA Fault 2 or low voltage -
2 ± 0.5mA Fault 1 -
4 ± 0.5mA Standby 0
14 ± 0.5mA Warning 1
19 ± 0.5mA Alarm 1.5
3.7.2 Relays
The detector includes 3 relays:
• Fault relay
• Alarm relay
• Accessory relay
Fault relay contacts are normally energized closed and opened when in
fault condition.
3.7.3 RS-485 Interface
The RS-485 input/output sends complete data information to a PC and
receives data or control commands from the PC. The protocol is Modbus-
compatible. Communication with the PC is operated through this interface
is executed only when used with appropriate host software.