Solartron Metrology LVDT, ±1mm stroke -40°C +85°C

COO (Country of Origin): GB

Miniature ac Energised Inductive Displacement Transducer

When the primary winding is connected to an AC supply, current starts to flow in the secondary coils. The secondary coils are connected in series opposition so that two voltages have opposite phase so when the core is in the centre position then voltages of equal magnitude but opposite phase will be induced in each secondary coil and the output is zero. As the core is moved in one direction the voltage in the corresponding secondary coil increases while the other coil experiences a complementary voltage reduction. The effect is a transducer voltage output that is proportional to displacement. Knowledge of the magnitude and the phase of the output with respect to the excitation signal allows one to deduce the position and direction of the core motion from the null position.

Low cost solutions to displacement measurement
Friction free operation with reduced guidance accuracy
Stainless steel body and push rod

  SM1 SM3
Calibration Load (Ω) 100k 100k
Primary Resistance (Ω) 102 69
Secondary Resistance (Ω) 204 200
Residual Voltage @ Zero 0.3% FSD (typ.) 0.3% FSD (typ.)
Lead Length (mm) 300 300
Operating Temp. (°C) -40 to +85 -40 to +85
Non-Linearity 0.3% 0.3%


Linear Variable Differential Transformers (LVDT)

These devices comprise a movable nickel iron core and three coils - one for energisation and two for pick-up. They need to be driven by a sine wave to produce an output amplitude and phase directly proportional to the position of the core with respect to the pick-up coils. A phase sensitive detector is required to demodulate the output signal. The main advantages of LVDTs are;

No wear problems as with potentiometers
Infinite resolution, high accuracy and linearity
No friction introduced into the measured system
Available in ranges from ±1mm to ±50mm


RS LVDT's datasheet Stock No. 232-4049 is available on request.

Attribute Value
Stroke ±1mm
Input Current Range 10 → 13 mA
Energising Voltage Range 1 → 10 Vrms
Sensitivity 69 mV/V/mm @ 1kHz, 110 mV/V/mm @ 2kHz, 142 mV/V/mm @ 5kHz, 147 mV/V/mm @ 10kHz, 149 mV/V/mm @ 20kHz
Response Time 1.5 ms
Overall Width 25mm
Minimum Operating Temperature -40°C
Maximum Operating Temperature +85°C
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