S2A LVDT Signal Conditioner


• Cybersecurity lock to prevent tampering
• Smart calibration by front panel push buttons
• Differential input for superior noise immunity
• Color-coded screw terminal plugs
• Auto-mastering
• Hot swapability
• Shorted, disconnected, or open primary
• Shorted, grounded, disconnected, or open secondaries
• Output voltage shorts or current loop opens
• Errors during installation and setup

Alliance Sensors Group's model S2A DIN-rail-mounting LVDT signal conditioner is designed specifically for the power generation industry. It offers comprehensive diagnostics for sensor or wiring failure, real time recalibration of the Full Span 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 ouptuts 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.

The RS-485 port also funstions with a setup GUI available and the S2A manual are available below.



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Operating Power: +15 to +30 V DC (+24 V nominal), 80 mA max. at 24 V DC; +15 V DC and -15 V DC needed for ±10 V DC bipolar output
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
-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); ≤2 μArms (current loop output)
Output Non-Linearity: ≤±0.025% of Full Span Output (FSO)
Operating Temperature: -20 to 75 C
Temperature Coefficient: ±0.002% of FSO/C (combined zero and span shift)
Excitation Frequencies: 1 kHz, 3 kHz, 5 kHz, 10 kHz (nominal)
LVDT Output Range: 50 mVrms to 5000 mVrms at LVDT’s full scale position
Excitation Voltage: 3.0 Vrms (nominal) push-pull drive (factory default) 4.5 Vrms (nominal) push-pull drive (via jumper change) 1.5 Vrms (nominal) single ended drive (for low impedance primary)
Auto-Master Syncing: Master output couples up to fifteen slave units; if the master fails, a new master is automatically generated for fail-safe excitation
Fault Detection: Open LVDT windings, shorted or grounded LVDT connections, LVDT cable disconnected, voltage output shorted or current loop open
Failure Indications: Flashing LED's; analog output driven out of range; open-collector switch, user settable to NO (default) or NC
Null Detection: Front panel LEDs; +/-3V DC null output signal
Zero Set: Front panel push button or RS-485 command
Full Scale Set: Front panel push button or RS-485 command
Digital Interface: RS-485 2-wire multi-drop network, 16 addresses
Cybersecurity Lock: User enabled