LVDT Signal Conditioner Module DIN-Rail-Mounted S2A

For Use In
Steam Valve Position Feedback
Governor and Throttle Valves
Interceptor and Stop Valves
Boiler Feedwater Pumps
Turbine Control Systems
LVDT Signal Conditioner
Advanced Smart Power Gen AC-LVDT Signal Conditioner

Alliance Sensors Group’s S2A DIN-rail-mounting LVDT signal conditioner is 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, enhanced ground loop noise rejection, and backward compatibility to legacy S1A signal conditioners.   Utilizing front panel push buttons for easy calibration, the S2A 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 5,000 mVrms range of sensor output.  S2A modules offer a choice of 8 analog outputs and half-duplex RS-485 digital communications to facilitate remote setup and for saving a module's setup parameters to hot swap them with another module.  

Technical datasheets and additional information can be found below.

  • - Cybersecurity Lock to Prevent Tampering
  • - Smart Calibration by Front Panel Push Buttons -- No Pots, No Calculations
  • - Color-Coded Detachable Terminal Plugs
  • - Real-Time Recalibration
  • - Comprehensive Diagnostics
  • - Null Detection LEDs
Operating Power: +15 to +30 V DC (+24 V nominal), 100 mA max. at 24 V DC; +15 V DC and -15 V DC needed for ±10 V DC bipolar output
Excitation Voltage: 3.0 Vrms (nominal) push-pull drive (factory default), 4.5 Vrms (nominal) push-pull drive (jumper J7 removed), 1.5 Vrms (nominal) single-ended drive for low impedance primary
Excitation Frequencies: 1 kHz, 3 kHz, 5 kHz, 10 kHz (nominal)
Auto-Master Syncing: Master output couples up to fifteen units; if original master fails, new master is automatically generated for fail-safe excitation control.
LVDT Output Range: 50 mVrms to 5000 mVrms at LVDT’s full scale position
Analog DC Outputs: 0 - 5 V, 1 - 5 V, 0.5 - 4.5 V, 0.5 - 9.5 V, 0 -10 V, -10 to +10 V, 0 -20 mA sourcing (3-wire), 4 -20 mA sourcing (3-wire)
Loop Resistance: 850 Ohms maximum with 24 V DC supply
Output Non-Linearity: ≤±0.025% of Full Span Output (FSO)
-3 dB Response: 10% (minimum) of excitation frequency (normal setting); 10 Hz (default) user adjustable (low noise setting)
Noise and Ripple: ≤1 mVrms (voltage output), or ≤2 μArms (current output)
Fault Detection: Open or shorted LVDT winding, open, shorted, or grounded LVDT connection, LVDT cable disconnected, open or shorted analog output
Failure Indications: Flashing LEDs; analog output driven out of range; 50 mA open-collector switch, user settable to NO (default) or NC
Null Detection: Front panel LEDs; ±3V DC max. floating null output signal
Operating Temperature: -20 to 75 C
Temperature Coefficient: ±0.002% of FSO/C (combined span and zero shift)
Zero Set: Front panel push button or RS-485 ASCII command
Full Scale Set: Front panel push button or RS-485 ASCII command
Digital Interface: RS-485 2-wire multi-drop network, 16 addresses
Cybersecurity Lock : User enabled

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