Airnet® II 4-Channel Particle Sensors Operations Manual
4-1
Chapter 4
4-20 mA Signal Configuration / Operation
Overview
The Airnet II 4-Channel particle sensor has an option to be ordered with the ability to
transmit five 4-20 mA signals. One signal communicates instrument status and the
other four signals transmit particle data from the four particle channels. This data is
typically collected and processed by a SCADA system.
4-20 mA Outputs
The instrument status signal is not controllable by the user.
Each channel is capable of driving a grounded load of 400 ohms or less. All grounds are
common and are common to the internal analog ground of the sensor.
NOTE:
The Airnet II 4-Channel particle sensor can output data to Facility Net
software while it also outputs 4-20 mA signals to a SCADA system.
Table 4-1
Summary of 4-20 mA Channel thresholds
First signal output
Channel 1 particle data
Second signal output
Channel 2 particle data
Third signal output
Channel 3 particle data
Fourth signal output
Channel 4 particle data
Fifth signal output
Instrument status
Table 4-2
4-20 mA Channel thresholds
Channel
201-4
301-4
310-4
501-4
510-4
1
0.2 µm
0.3 µm
0.3 µm
0.5 µm
0.5 µm
2
0.3 µm
0.5 µm
0.5 µm
1.0 µm
1.0 µm
3
0.5 µm
1.0 µm
1.0 µm
5.0 µm
5.0 µm
4
1.0 µm
5.0 µm
5.0 µm
10.0 µm
10.0 µm
