Everight Position Technologies Corp.
102 Commerce Dr. Unit 8, Moorestown, NJ 08057
856-727-9500 or info@everightsensors.com
Linear
and Rotary
Variable Differential Transformer (L/RVDT)
The choice for applications where the
physical environment is most difficult, including extreme
pressure, extreme high or low temperature, and extreme shock
and vibration. Also often used for very long term reliability
requirements. Signal conditioning electronics are generally
located separately from the sensor in a more benign environment.
Variety of analog outputs.
Contact / Contactless
Operation; Moving Element Material Characteristic
Contactless Moving Element is high
permeability metal
Linear Measuring
Range
1.3 to 800 mm
Rotary Measuring
Range
Fractional turn to ~110 deg, calibration
to customer spec
Total Accuracy
(Comb: Non-linearity, repeatability, hysteresis)
+/-0.25% FRO (relatively average)
Available I/O's,
Frequency Response
Historically: +/-15V DC input,
+/-10V DC output; Now 24V DC input, 0-10V DC output
is common. Freq Response: Average to Low
Susceptible to AC fields (dependent
upon shielding)
Stroke-to-Length
Ratio (Linear Only) (lower is better, 1:1 is ideal)
Generally 2:1 or more in DC-DC
form; can be as low as 1.2:1 as layer wound in AC-AC
form
Relative Cost
to User
Very high; AC-AC requires separate
electronics
Application Types
General machinery and process control
apps. particularly in most demanding environmental conditions
of temperature, pressure, shock and vibration
General Comments
Traditional choice in high performance
position sensing difficult and expensive to build
but most rugged now being superceded where possible
in many apps by less expensive and more compact L/RVIT's
Everight Position Technologies Corp.| 102 Commerce Dr. Unit 8, Moorestown,
NJ 08057 | 856-727-9500 or info@everightsensors.com