DPM3 User Manual, 1st Edition
User Manual - DPM3 Series Panel Meters
15
Process input
The DPM3 is designed to measure all kinds of process variable with direct indication in
engineering units.
The parameter to configure as process indicator is the input type, in volts in a -10 V to 10 V
range and in milliamperes in a -20 mA to 20 mA range.
Load cell input
Refer to cell manufacturers documentation, particularly with respect to the cell sensitivity and
supply voltage specifications.
As load cell indicator the meters function is to measure forces (weight, pressure, torque...) when
connected to several bridge type transducers such as load cell, which supply signal levels up
to ±150 mV. The excitation voltage supplied by this instrument is 10V. Up to 2 cells can be
connected in parallel with 10 V excitation without need for an external source.
Example:
2 cells with 2 mV/V sensibility are supplied with an excitation voltage of 10 V; the
voltage generated by each cell at full load is 20 mV, being 20 mV the maximum as the
cells are connected in parallel.
Configuration requires selection of the input range which may be selected high enough for the
maximum input signal to avoid overloads. There are three ranges: ±15 mV, ±30 mV and ±150
mV
Example:
If a weighing process gives 12 mV to the meter input with maximum load, the best input range
to select will be “15 mV”.
Pt100 RTD Input
When configuring the meter as thermometer for 3 wires Pt100 sensors, the temperature ranges
and resolution available are:
Input
Range (res. 0.1°)
Range (res. 1°)
Pt100
-200.0 to +800.0°C
-200 to +800°C
-328.0 to 1472.0°F
-328 to 1472°F
The Pt100 software menu allows selection of temperature units (Celsius or Fahrenheit),
resolution (degree or tenth of degrees) and a display offset. Offset value is programmed for a
known difference between the temperature under measurement and the temperature read by the
sensor. This difference can be corrected by programming an offset from -19.9 to +99.9.
LED
TARE will light up each time that an offset value is programmed.
Example:
In a process of temperature control the Pt100 sensor is located in a part of the process
where temperature is 10 degrees below than the point where the control has to be done. By
programming an offset of 10 points, with 1 degree resolution, the deviation will be corrected.
Configurable parameters for this input are:
