ABB LGR-ICOS GLA531 Series - Analog Outputs and Modbus Signals

Operating Manual
3KXG165002R4201_2021_04 ABB PROPRIETARY INFORMATION 39
GLA531 Series LGR-ICOS™ Gas Analyzer
4–20 mA Isolated Analog Outputs
The 4-to-20 mA analog signals for gas concentration measurements are ported out through a 5.08 mm terminal
block for gas concentrations on the analyzer interface plate (Figure 30). Depending on the analyzer model, up to
four individual gases can be measured and reported. The four single-ended connections on the interface plate,
CH1, CH2, CH3, and CH4, are the connection points for the 4-20 mA Gas Concentrations Signal wirings (see
Figure 31).
Figure 31 Gas Concentration Screw-Terminal Connections
The warning/alarm signals are ported out through the terminal block for the analyzer warning/alarm, as shown in
Figure 32. Two single-ended connections, CH5 and CH6, are the connection points for the 4-20 mA
warming/alarm monitors.
Figure 32 CH5 Temperature and CH6 Analyzer Warning/Alarm Screw-Terminal Connections
Table 8 and Table 9 provide the current outputs in milliamps (mA) and their corresponding warning/alarm
description in the analyzer.