|
We combine the appropriate mechanical packaging and
electronic interface to work seamlessly into your design using these position
sensor technologies:
|
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
|
|
Environmental
Capabilities: Operating Temp. Range, Pressure, Shock/Vibration
|
Very high to highest
|
|
Susceptibility
to External Magnetic Fields
|
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but most rugged…now being superceded where possible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
|
|
