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4-20 mA Analog Output
The analog output signal at pin 18 of the 25-pin connector can be configured to provide the
instrument's native mode 0-2 Volt output or the optional 4-20 mA output by setting a single
jumper. Refer to the tables below for jumper placement. (Pin 23 is the ground pin for the analog
output function. Pin 18 is positive with respect to the ground pin).
•
The 0-2 Volt output circuit can drive loads of 10K ohms or higher.
•
The 4-20 mA output is a passive transmitter and requires the connected receiver to supply
between 10 and 28 volts of excitation potential.
The analog output signal is based on the entire range (0-.999 mg/m3).
Note that neither analog output circuit is floating. The negative terminals of both circuits are
connected to the instrument's common ground buss.
Jumper Sw101 Functions (Non-SMV Instruments):
Pin Pair Jumped
Function
V
0-2V analog output
I
4-20 mA analog output
Note: Power off the instrument before moving the jumper.
Jumper JMP3 Functions (SMV Instruments):
Pins Jumped
Function
1&2
0-2V analog output
2&3
4-20 mA analog output
Note: Power off the instrument before moving the jumper.