Spectrex Xenon 700 SIL Open-Path Gas Detection System - Manual (Page 30)

SafEye TM Xenon 700S SIL Gas Detector
18 System Set Up
Table 6: Optional - Discrete Reading of 0-20mA at Different Detector
Modes
Current Reading Status and Description
LEL.m
Setting
0+0.3mA Fault 2 or Low Voltage -
1±0.3mA Zero Calibration -
2±0.3mA Fault 1 -
3±0.3mA “Maintenance Call” -
4±0.5mA Standby -
14±0.5mA Warning 1
19±0.5mA Alarm 3
21mA Concentration is over the range limit
(more than full-scale concentration).
3.2.2 Dry Contact Relays
The detector may include up to three of the following relays depending on
the wiring configuration:
 Fault relay
 Alarm relay
 Accessory relay
Alarm and Accessory relays are normally non-energized open. When in the
alarm or warning status the appropriate relay is closed.
Fault relay is normally energized closed, and when it is in the fault condition
the relay is opened.
3.2.3 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. The communication with the PC that is operated through the
interface is executed only when used with appropriate host software.
3.3 System Set Up
This section includes the following options:
 Detection Function Programming, page 19
 Detection Set-Up Function, page 19