Alliance Sensors Group introduces S2A LVDT signal conditioner

  • April 27, 2018
Alliance Sensors Group introduces S2A LVDT signal conditioner
Alliance Sensors Group introduces S2A LVDT signal conditioner

April 27, 2018 -  H.G. Schaevitz LLC dba Alliance Sensors Group introduced its LVDT signal conditioner, the S2A.  This LVDT signal Conditioner offers LVDT/RVDT setup and has been engineered to work with a range of LVDTs, RVDTs, and inductive half-bridge sensors including 3-wire GE LVRTs and GE gas turbine buck-boost style LVDTs. The signal conditioning module has cyber security tamper prevention and notification features.

S2A Operating Features:

  • Push button calibration
  • Built-In null indication
  • 4 excitation frequencies, 8 analog DC outputs (6 DC voltage and 2 current loop outputs)
  • 16 addresses for RS-485 digital communications
  • Hot swap capability
  • Advanced master/slave capability to reduce cross talk

The S2A has more system diagnostic capabilities than any stand-alone LVDT conditioner on the market. This LVDT Signal conditioner offers fault or failure detection for high reliability applications like nuclear power plant steam turbine controls. The S2A’s diagnostics can detect at least eleven (11) fault conditions. See the list of features below. 

S2A Diagnostic Features:

  • Shorted primary,
  • Disconnected or open primary,
  • Shorted or grounded secondaries,
  • Disconnected or open secondaries,
  • Analog output shorts or opens,
  • Common hook-up errors that can occur during initial installation and setup.
  • Cybersecurity to prevent tampering and notify main system operations of tamper attempt.
  • Real-time recalibration to tweak the analog output after the mechanical system’s warmup.
  • Recalibration from the module’s front panel or over the RS-485 bus.
  • Differential input which common modes out most ground-loop developed noise signals.
  • Backward Compatible to perform exactly as the legacy S1A conditioner.

The S2A offers push button calibration. With an S2A signal conditioner, the internal microprocessor eliminates any need to calculate jumper connections for gain, range, etc. The operator finds null, then moves the LVDT core to one end of the range and presses the front panel Zero button. Once set, the LVDT’s core is moved to the other end of the specified range and the front panel Full Scale button is pressed.  The S2A is then fully calibrated with the position sensor.

The S2A DIN-rail-mounted module can be “hot swapped” into an existing installation, with original calibration data saved and then reloaded into a new module via its RS-485 port.  Conventional signal conditioners would require a full calibration. The S2A also can be setup remotely using a computer connected through the digital communications link to the RS-485 bus.

For installations involving multiple position sensors, the S2As can be master/slaved to prevent cross talk between sensor signals. Should a master fail, conventional signal conditioners will revert to their own oscillators, opening them to cross talk the master/slave configuration was to prevent. If the master S2A fails, the first slave becomes a new master for all the other slaves.

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