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Vaughn Associates, Inc.

Manufacturer we represent

RDP Electrosense in the Southeast

LVDTs, load cells, pressure transducers and signal conditioning from an independent displacement-sensing specialist founded in 1966.

Headquarters
Pottstown, PA (US) · Wolverhampton, UK
Founded
1966
Parent
RDP Electronics Ltd
Coverage
All Vaughn Associates territories (North Carolina only within the North Carolina, Virginia, Maryland & D.C. territory)

About RDP Electrosense

RDP Electrosense is the North American office of RDP Electronics Ltd, an independent, privately owned UK manufacturer of measurement transducers and instrumentation founded in Wolverhampton, England, in 1966. The Pottstown, Pennsylvania office has handled US and Canadian sales and support since 1982.

RDP was one of the early producers of LVDTs (linear variable differential transformers) and says it was the first to build the signal-conditioning amplifier into the LVDT body. That heritage still defines the company: displacement sensing first, supported by load cells, pressure transducers and the electronics to condition and display their signals.

What RDP makes

The displacement range stretches from sub-millimetre gauging probes to long-stroke sensors. Stainless D5 and D6 LVDTs cover general industrial work, GT probes serve inspection fixtures, and internally amplified DCTH, LDC, DCV and DCC models run from DC power and deliver voltage or 4–20 mA directly.

Where conditions get difficult, RDP has specific answers. The D5W, ACW and DCW are sealed for submersion, and welded 316 stainless SSA and SSD units are designed for long-term seawater immersion beyond 2 km. LIN and PY differential-inductance sensors carry no internal electronics and operate from −220 °C up to 600 °C in high-temperature variants, with some models tolerating radiation up to about 1 GGy.

Rounding out the line are strain gauge load cells from about 250 g to 2.2 MN, gauge, absolute and differential pressure transducers, S7 panel-mount and DR7 DIN-rail amplifiers, E-series indicators and the Modular 600 multi-channel rack.

Why engineers specify RDP

  • Contactless sensing. An LVDT’s core never touches its coils, so the sensor does not wear and resolution is effectively unlimited.
  • Environmental range. Options span cryogenic to 600 °C, vacuum to high pressure, deep seawater and high radiation.
  • Matched systems. Sensor, amplifier and display can come from one supplier and be calibrated together.
  • Adaptable designs. RDP will modify a standard product when a catalog sensor falls short.
  • Quality system. RDP operates under an ISO 9001:2015 certified quality system.

Local support from Vaughn Associates

Displacement, force and pressure measurements run through Huntsville aerospace test labs, Southeast automotive test rigs, and power generation and process plants along the Gulf Coast. Vaughn Associates helps engineers choose the right RDP sensor, stroke, output and conditioning for each of these settings.

We review mounting, environmental and signal requirements, coordinate quotes and technical questions with RDP, and follow through after the order. Vaughn covers RDP in every territory, with North Carolina the only covered state in our North Carolina, Virginia, Maryland and D.C. territory.

Request application help, explore LVDT and displacement sensors, load cells and force sensors or pressure transducers, or find your local rep.

About 60 years of LVDT design and manufacturing

Sensors for −220 °C to 600 °C, deep seawater and high-radiation service

Sensor, amplifier and display available from a single source

Willing to build special versions for unusual applications

US sales and support office in Pottstown, Pennsylvania

Product lines

What RDP makes — product categories we can help you specify.

01

Industrial AC LVDTs

Stainless steel LVDTs in unguided, spring-return and guided versions, with D5/D6 ranges from about ±0.25 mm to ±75 mm and linearity options down to ±0.1%.

  • D5
  • D6
  • ACT

02

Precision gauging LVDTs

Probes running on linear bearings with repeatability of about 0.15 µm, built for dimensional inspection and quality control fixtures, including air-push versions.

  • GT

03

DC (internally amplified) LVDTs

LVDTs with the oscillator and demodulator built into the sensor body, so they run on DC power and output 0–10 V, ±5 V or 2-wire 4–20 mA directly.

  • DCTH
  • LDC
  • DCV
  • DCC

04

Submersible and seawater LVDTs

Sealed sensors for immersion in fluids, plus welded 316 stainless units designed for years of seawater immersion at depths beyond 2 km.

  • D5W
  • ACW
  • DCW
  • SSA
  • SSD

05

Extreme-environment inductive sensors

Differential-inductance displacement and non-contact proximity sensors with no internal electronics, for cryogenic, high-temperature, high-pressure and high-radiation locations.

  • LIN
  • PY

06

Load cells and force sensors

Strain gauge load cells in tension, compression, universal and single-point styles for test rigs, presses and industrial weighing.

  • RLU
  • RLC
  • RLS
  • RLT
  • RLW

07

Pressure transducers

Strain gauge sensors for gauge, absolute, flush-diaphragm and differential pressure, with ranges extending to very high hydraulic pressures.

  • TJE
  • STJE
  • FP2000
  • KZ

08

Transducer amplifiers

Single-channel signal conditioners for LVDT and strain gauge sensors in panel-mount and DIN-rail formats, powered by AC, DC or the 4–20 mA loop.

  • S7AC
  • S7DC
  • S7M
  • S7MZ
  • S7TW
  • DR7AC
  • DR7DC

09

Digital indicators and multi-channel systems

Panel indicators for strain gauge and LVDT inputs, and a rack system that mixes sensor, alarm, display and logging cards for test stands.

  • E308
  • E309
  • E725
  • Modular 600

Applications

  • Valve and actuator position feedback
  • Turbine casing expansion
  • Reactor component position in high-radiation zones
  • ROV and subsea actuator position
  • Structural and fatigue test rigs
  • Suspension travel in automotive testing
  • In-process dimensional gauging
  • Crack and settlement monitoring
  • Press and industrial force measurement
  • Multi-channel test stand signal conditioning

Standards & certifications

  • ISO 9001:2015

FAQ

Common questions about RDP

What is an LVDT and how does it work?

An LVDT, or linear variable differential transformer, is an inductive position sensor. A primary coil driven with AC excitation sits between two secondary coils, and a free-moving ferromagnetic core attached to the moving part shifts the magnetic coupling between them. The differential voltage is proportional to displacement, and its phase shows direction. Because the core never touches the coils, the sensor does not wear.

What is the difference between an AC LVDT and a DC LVDT?

An AC LVDT needs an external conditioner to supply excitation and convert the secondary signals into a usable output. A DC LVDT, such as RDP's DCTH, LDC, DCV or DCC, has that electronics built into the sensor, so it runs from a DC supply and outputs voltage or 4–20 mA directly. AC types handle heat, radiation and small sizes better, while DC types simplify wiring.

Which RDP sensor works for subsea or underwater displacement measurement?

It depends on the fluid and depth. The D5W, ACW and DCW are built for submersion in non-corrosive fluids at moderate pressure, with the D5W rated to 3.4 MPa. For long-term seawater immersion, the SSA and SSD series use welded 316 stainless steel and are designed for about ten years at depths beyond 2 km. Unguided versions require the core to be guided externally.

Can LVDTs work in nuclear, cryogenic or high-temperature environments?

Yes, with the right design. RDP's LIN displacement transducer and PY non-contact sensor use differential-inductance sensing with no internal electronics. Standard models operate from −220 °C to 220 °C, and high-temperature variants reach 600 °C. They withstand pressures up to 20 MPa, and some models tolerate radiation doses up to about 1 GGy, making them suitable for turbines, reactors and research rigs.

Is RDP Electrosense still operating in the United States?

Yes. RDP Electronics' current website lists RDP Electrosense in Pottstown, Pennsylvania, as its office for the United States and Canada. The US operation was established in 1982 and continues to handle sales and support across North America. The parent company, RDP Electronics Ltd of Wolverhampton, England, is independently owned and actively trading, and it continues to design and manufacture displacement transducers and instrumentation.

Who represents RDP Electrosense in the Southeast?

Vaughn Associates, Inc., an independent manufacturer's representative headquartered in Huntsville, Alabama, represents RDP Electrosense across its Southeast territories. In the North Carolina, Virginia, Maryland and D.C. territory, coverage is North Carolina only. Vaughn's engineers help select sensors, strokes, outputs and signal conditioning, coordinate quotes with RDP and follow through after the order.

Your RDP sales engineers in the Southeast.

Coverage: All Vaughn Associates territories (North Carolina only within the North Carolina, Virginia, Maryland & D.C. territory).

Eric Woods
Eric Woods

North Alabama, Georgia & South Carolina

Joshua Woods
Joshua Woods

Tennessee, Arkansas & North Mississippi

Scott Fullagar
Scott Fullagar

North Carolina, Virginia, Maryland & D.C. (North Carolina only)

Request a quote

Get pricing and application help for RDP.

Share your requirements and a Vaughn sales engineer will coordinate with the factory on the right configuration and a quote.

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