• Choice of Single or Dual Channels
  • Programmable Setpoint Control
  • Auto Calibration
  • Both Analog & RS232 Digital Outputs
Download Spec Sheet

Columbia Models LD4310 and LD4320 microprocessor-based LVDT indicator and set-point controllers are designed for industrial and process control applications utilizing any Columbia H, M, or S Series LVDT. In addition to displaying real-time LVDT readings, these instruments display MIN, MAX and TIR values. Model LD4320 also provides sum and difference of the two channel readings.

A two-line alphanumeric display provides user friendly word prompts for easy pushbutton system setup. Four userprogrammable digital setpoints are used to monitor parameters. Any combination of high or low setpoints may be selected. A high and low hysteresis value from 0 to 200 display counts can be programmed for the setpoints. Decimal points are programmable via the set-up menu.

A front panel pushbutton auto-zeros (tares) over the + full scale range. Auto-calibration eliminates calculation of slope or gain factors. Calibration and setup parameters are stored in nonvolatile memory for retention on power down or interruption.

A 16-bit analog-to-digital converter provides high speed performance and resolution. The RS-232 output will communicate data to any standard PLC or computer serial port at 600 to 19.2K baud.


Linearity <+0.02% of Full Scale
LVDT Excitation Voltage 1 and 3 V rms (+10%) Switch Selectable Current Up to 30 mA rms per LVDT1 2
Frequency 400 Hz, 1000 Hz, 3000 Hz & 5000Hz (+5%) Switch Selectable
Input Sensitivity 1.8 or 4.5 V rms for full scale readout (Switch Selectable)
Digital Display 5 Digit (+99.999) 5 mm (0,2") super-twist LCD with LED backlight
Analog-to-Digital Converter Converter 16-Bit Charge Balance
A-D Conversion Rate 180 Conversions per Second (Max.)
Input Impedance 100K Ohms
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