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2119-2

 

These Digital Panel Meter (DPM) models provide highly accurate, stable, and repeatable temperature indication for signals from 100-Ohm Platinum Resistance Temperature Detectors (RTD’s) with DIN "alpha" of 0.00385 or ANSI "alpha" of 0.003925.

RTD range and resolution (1° or 0.1°) are selectable from the front panel or via special commands issued over the optional serial interface.  Data display in units of degrees Kelvin or Rankine can be selected by offsetting the Celsius or Fahrenheit range, respectively.

Open sensor indication is standard, and may be set to indicate either upscale or downscale.

RTD excitation of 0.2 mA is provided by the meter, and is monitored to make ratiometric corrections for excitation-supply variations.

RTD connections can be of the 2-, 3-, or 4-wire type, with appropriate compensation for load resistance of the sensor.  Thus, in a 2-wire hookup, the meter senses the voltage drop across the 100-Ω RTD and both lead wires.  The effect of the lead wires can be measured and subtracted by shorting out the RTD during meter setup.  For 3- and 4-wire connections, the meter senses the voltage drop across the 100-Ω RTD and both lead wires, as well as the voltage drop across the RTD and one lead wire.  This allows it to determine the effect of one lead wire and mathematically subtract the effect of both lead wires.

All ranges for all temperature sensor types are digitally calibrated at the factory to IEC or NIST standards, thus eliminating the need to recalibrate in the field for potentiometer-related drift errors.

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.

With the optional Analog Output Board, these meters can serve as superb, isolated 4-20 mA transmitters.  The analog output is scaled to the display, which is linearized to °C or °F and is exceptionally accurate.  The analog output tracks the high read rate of the meter (up to 56 readings per second at 60-Hz power).  Fast update rates are beneficial in many closed-loop and PID control applications.

With the optional Dual Contact or Solid-State Relay Board, a temperature meter can serve as an extremely fast and accurate ON/OFF controller for closed-loop temperature control, or as a supervisory process monitor, providing alarms or shutoffs when the process exceeds normal limits.

 
 
 

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