Bullet Sensors & Transducers e-Digest, Vol. 72, Issue 10, October 2007: Product News

    (ISSN 1726- 5479)


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Low Voltage LVDT Signal Conditioner Designed for Use in PLCs and Vehicular Testing Systems


Pennsauken, NJ, - Macro Sensors introduces a new single channel, low voltage signal conditioner that supports any standard LVDT, RVDT and VRT half-bridge sensor. Operating from 12V or 24V DC power, the Model LVC-2500 DC-LVDT Signal Conditioner is designed specifically for use in 24V systems with PLCs and mini-PLCs or in 12V mobile and vehicular testing systems.


Units offer three analog outputs: bipolar 0 to "10 V DC, unipolar 24 V DC, or 4 to 20 mA (sourcing) in a 3-wire common ground system in which the power ground is connected to the output signalís ground.  By shifting a movable internal jumper in the LVC-2500 Signal Conditioner, users can choose between 3, 5, or 10 kHz nominal excitation frequencies at a level of 3V rms for operating LVDTs with primary impedance.  For multiple channel applications, several LVC-2500 modules can be connected together in a master/slave mode to synchronize their excitation oscillator frequency. This eliminates the effects of spurious beat frequency signals, cross talk, and intermodulation effects.


Internal circuitry produces a low distortion sine wave to excite the LVDT and a synchronous demodulator to convert the LVDT's AC output to a more useful DC voltage proportional to core position.  Additional circuitry regulates DC operating power and provides span and zero adjustability, a two-pole low pass output filter, and the voltage-to-current conversion that drives the current loop output.


Packaged in a DIN-rail mounting thermoplastic case, the LVC-2500 withstands the abuse of different factory environments.  Front-panel, externally accessible span and zero controls permit output offset adjustment from -100% to +100% of full-scale output.  Units incorporate movable coarse gain jumpers, which allow it to operate over an LVDT full-scale output signal range of greater than 100 to 1.  As the LVC-2500 does not require phase adjustment control, it works with reasonably long cables between it and the LVDT.


The LVC-2500 Signal Conditioner also offers several popular math functions that can be used between two modules. These include A+B, A-B,(A+B)/2, and (A-B)/2. Therefore, two LVC-2500 modules can be connected together, along with a pair of LVDT gaging probes, to measure differential dimensions, thicknesses, and average height of products in SPC and other quality control applications.

LVC-2500 DC-LVDT Signal Conditioner





Ed Herceg,

Macro Sensors

U.S. Route 130 North, Bldg. 22

Pennsauken, NJ 08110-1541

Tel.: 856-662-8000

E-mail: eeh@macrosensors.com



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