4-20mA Loop

The 4-20 mA current loop is normally supplied in a “Self Powered” configuration.
The loop can drive from 1 ohm to 500 ohm loads.
The loop drive is isolated from the Service Power by 2000VAC for AC Powered units and 500VDC for DC powered units.
The loop will normally produce 4 mA when the analyzer reading is 0.000 and 20 mA when the analyzer reading is at or above full scale.
The loop can be calibrated at the analyzer to account for local conditions.
Loop powered configurations and higher load driving configurations are available.
During calibration, the loop will normally hold the last value before calibration. The loop can also be configured to follow the calibration.
During a Diagnostic Alarm (Tape Out, Tape Dark), the loop will go to maximum. The loop can also be configured to go to 4 mA or hold the last value during Diagnostic Alarm
If the loop is not connected or is connected to too high of a resistance, "LOOP OPEN" is displayed on the main screen status line.

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