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To utilize the 4-20mA output, connect the positive wire of your 4-20mA system to pin 19 of the
I/O port on the J405, and the negative wire to pin 20. The number of each pin of the I/O port is
labeled on the port itself, and the locations of pins 19 and 20 can also be seen in the diagram
below. The 4-20 mA connection is passive and must be powered by an external 12 V DC power
supply.
An example setup is shown below.
In this example, the 5.522mA current level displayed above would correspond to a Hg
concentration of 47.56 µg/m
3
.
After configuring your system, the J405 Diagnostics feature can be used to test your setup. When
the 4-20mA test portion of the diagnostics is reached, the instrument will output current levels of
4, 8, 12, 16 and 20mA, and the current level displayed on the J405 should match the readout of
your 4-20mA system. See
for additional info on running the diagnostics feature.
After confirming that the system is configured correctly, use the instrument as normal, and the
4-20mA signal will be output automatically by the J405.
The 4-20mA output is accurate to within ±1.5% of the full scale.
