Alliance Sensors Group S2A LVDT Transmitter

The Alliance Sensors Group S2A LVDT transmitter is a DIN-rail-mounted signal conditioner designed specifically for the power generation industry.  It offers comprehensive diagnostics for sensor and wiring failure, real-time recalibration of the Full Scale and Zero outputs, and enhanced ground loop noise rejection.

The S2A utilizes front panel push buttons for easy calibration. It is engineered to work with the widest range of LVDT, RVDT, and inductive half-bridge LVRT sensors by providing four excitation frequencies that will operate most AC-LVDTs over a 50 to 5000mVrms range of sensor output.  S2A modules offer 8 analog outputs and half-duplex RS-485 digital communications for remote setup and for saving a module’s setup parameters to hot swap them with another module.  

Applications:
Steam Valve Position Feedback
Governor and Throttle Valves
Interceptor and Stop Valves
Broiler Feedwater Pumps
Turbine Control Systems

Features

• Excitation voltage:
  • 3.0Vrms (nominal) push-pull drive
  • 4.5Vrms (nominal) push-pull drive
  • 1.5Vrms (nominal) single-ended drive
• 1, 3, 5, and 10kHz (nominal) excitation frequencies
• 50 to 5000mVrms LVDT output range
• Master output controls up to fifteen slave units
• 8 analog DC outputs
• 850Ohms loop resistance max with 24V DC supply
• ≤±0.025% output non-linearity
• Diagnostic features:
  • Shorted, disconnected, or open primary
  • Shorted, grounded, disconnected, or open secondaries
  • Output voltage shorts or current loop opens
  • Errors during installation and setup