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Installation Step 8: Wiring Current Loop (4-20 mA Output)
Each current loop output produces a current which varies linearly from 4 to 20 mA as the concentration of gas varies
from zero to full scale concentration. The gas concentration for 20 mA full scale defaults to the full scale of the gas.
Furthermore, the Vertex™ VC4 can be configured lower to reduce these output currents to 2 mA if certain faults
occur. These outputs will drop to zero mA after a power failure.
The current loop connection points are located on the I/O Panel. The impedance range of the analog output is 100-
800 ohms. All wiring should follow the wiring guidelines described in Guidelines Specification.
TM
Vertex
VC4 System
34
User Manual
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