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These Digital Panel Meter (DPM) models accept current signals within the ISA standard range of 4 to 20 milliamperes.  They can also be used to produce scalable readout from strain gages, or in potentiometer follower applications, where the transducer output is a changing resistance.  (Strain gages with a 20-mV output can be scaled to display up to 10,000 counts, while outputs of 200 mV can be scaled to 99,999 counts.)

The isolated 24 V-DC, 50-mA excitation output (which is standard for all 2000 Series DPM's) is ideal for powering external two-wire, 4-20 mA transmitters (see the figure below; when powering strain gages or potentiometers, the 5- or 10 V-DC excitation is monitored by the meter to eliminate errors caused by excitation voltage variations).  The same two wires are used to apply voltage and carry the output current.  Inside the meter, the 4-20 mA current is dropped across a 10-Ω resistor.  The resulting 40- to 200-mV voltage is then sensed by the meter and scaled to engineering units.

The "X" version (Model 2162X) allows custom scaling, as specified by the user at the time of order (specify minimum input value, minimum displayed reading, maximum input value, and maximum displayed reading).  Contact the factory for more details.

All current ranges for the 2162 and 2162X are calibrated at the factory, with calibration factors for each range stored in internal EEPROM.  This allows ranges to be changed in the field without having to recalibrate the meter.

As with all 2000 Series DPM’s, the peak value of the input signal is automatically captured and may be displayed via front-panel push button or a control signal received at the rear connector (since the last meter reset).  Data readings and outputs can be separately selected to be either filtered or unfiltered.  See Digital Panel Meters (DPM’s) for a full description of these and other standard DPM features.

2000 Series options applying to the 4-20 mA meter include

	Isolated Relay Outputs
	Isolated Analog Output
	RS232 or RS485 Interface
	BCD Digital Interface
	Low AC/DC Power

Process Signal Meter Specifications  [Top ] (Click here for 2000 Series General Specifications)
Current Input Range*	Resolution	Input Ohms	Error ± 1 Count
20.000 mA	1 μA	10 Ω	0.01 % full scale
Span Temperature Coefficient	±0.003% of reading/°C
Zero Temperature Coefficient	0.1 count/°C
Normal-Mode Rejection at 50/60 Hz	90 dB with minimum digital filtering
Common-Mode Rejection from DC to 60 Hz	130 dB
Overcurrent Protection	8x for 20 mA
* In actuality, the 2162/2162X accommodates all four input ranges of the Model 2161 DC Current Meter, with identical values of resolution, input ohms, and error. Voltage input ranges of the 2162/2162X—and corresponding resolution, input ohms, and error—are identical to those of the Model 2160 DC Voltage Meter.