LVDT Signal Conditioner and Amplifier (LVDT OBSOLETE)

Signal Conditioning
  • LVDT sensor excitation of 4.5 V RMS is provided
  • Selectable sensitivity from 20 mV to 10 V and fine trim with potentiometer
  • Analogue outputs of 4-20 mA & 0-10 V
  • Selectable excitation frequency between 1 and 5 kHz
  • Wide bandwidth (200 Hz) for test & measurement applications
  • IP67 ABS bulkhead mountable case with cable glands


This unit is now obsolete. For technical support or repair please speak to our sales team or local distributor.

The model LVDT or RVDT signal conditioner and amplifier provides a convenient and flexible solution to the measurement of displacement or position (linear or angular) when using Linear Variable Differential Transformers or Rotary Variable Differential Transformers (LVDT's or RVDT's).

The analogue amplifier device can be powered from an AC or DC supply, and can provide the excitation needed by the attached transformer.

The excitation frequency can be selected from 5 options between 1 and 5 kHz and the conditioned signal can be output via a bipolar voltage channel or via a current loop channel, both being provided as standard.

  Min Typical Max Units
Power supply AC LVDT/A only (110/230 V AC) 50-60Hz 99/198 110/230 126/253  V AC
Power supply DC: LVD/A and /D 18 24  28  V DC
Power supply current DC: (depends on loading) 138 145 150  mA (200R)
Excitation   4.5    V rms
LVDT Frequency (Selected by Switch 1,2,3,4,5 kHz) 1   kHz  ±20%
LVDT Impedance 50 200    Ohms
LVDT Sensitivity (switchable) 0.02   10  V
Gain adjustment (Pot - fine adj)     25  % FR
Offset adjustment (Pot - fine adj)     10  % FR
Offset adjustment (Switchable - coarse adj)     30  % FR
Output load (voltage output) 0   mA
Output load (current output)     500  Ohms
Filter cut-off (switchable ranges) 5   200  Hz
Zero temperature coefficient    2  4 µV/ºC
Span temperature coefficient   0.01  0.015  % FR/ ºC
Linearity   0.05  0.1  % FR
Gain stability- 1st 1000 hours   0.2  0.4  % FR
90 day offset stability   10  µV
Operating temperature range 0   50  ºC
Storage temperature range -20   70  ºC
Humidity     95  %
Noise (1kHz / 20Hz filter / DC powered)   mV p-p
Output Options ±10V, ±5V, 0 - 10 V, 0 - 5V, 0 - 20mA, 4 -20mA. NB: Current output is link selectable for source or negative sink (common negative or common positive) 
Connections Field screw terminals - 2.5mm² rising clamp
Enclosure ABS case 164 x 84 x 50 sealed to IP67 fitted with 3 off cable glands    
Controls Gain pot, Offset pot, Coarse gain switches
Coarse offset switches, Filter cut-off switches
Frequency select switch, Output mode switch 
Relative Humidity 95% maximum non condensing
CE Environmental Approvals European EMC Directive 2004/108/EC, Low Voltage Directive 2006/95/EC


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Dimensions of lvdt 4-20mA 0-10V converter


No relevant software available

Product order options

Please read the following before selecting the options for this product:
Select the appropriate product based on your choice of power supply.

Options Code
Signal Conditioner & Amplifier DC Powered LVDT/D OBSOLETE
Signal Conditioner & Amplifier AC Powered LVDT/A OBSOLETE
Q: Does the SGA / LVDT lose its calibration if you switch it from 4-20 mA to 0-10 V?

A: Yes 

For more 'Frequently Asked Questions' please see our Knowledge Centre

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