Signal Conditioner

NT-C-5000

The NT-C- 5000 smart LVDT Signal Conditioner module from NewTek Sensor Solutions ends the difficulties that accompany AC-LVDT setup with built-in null indicators and front panel pushbuttons to set zero and full scale output. Engineered to work with AC-LVDTs and inductive half-bridge LVRTs, the NT-C- 5000 offers a choice of 4 excitation frequencies and 8 analog outputs, operates LVDT sensors with over a 40 dB dynamic range of AC output, indicates most common system failures, and incorporates a 2-wire RS-485 digital communications port. Along with color-coded plug-in screw terminal connectors and a 2 year warranty, these are just a few of the many advanced features that make NewTek Sensor Solutions NT-C- 5000 module an extremely versatile smart LVDT signal conditioner.

Features

  • Smart setup with front panel push buttons
  • Built-in null indication with front panel LEDs
  • Auto-mastering fail-safe excitation syncing for multiple units
  • Self-diagnostics for LVDT failure or disconnect
  • Digital communications via RS-485 2-wire multi-drop bus
  • Hot swapability — – setup can be saved and reloaded via RS-485 port

Applications

  • Steam Valve Position Feedback
  • Governor and Throttle Valves
  • Interceptor and Stop Valves
  • Boiler Feedwater Pumps
  • Turbine Control Systems

Specifications

Operating Power:           +15 to +30 V DC (+24 V nominal), 60 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 (via jumper change)

1.5 Vrms (nom) 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 slave units; if master

fails, new master is automatically generated for fail-safe excitation


LVDT AC Output Range: 50 mVrms to 5000 mVrms at LVDT ís 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, 4 -20 mA sourcing


Loop Resistance:            850 Ohms max. 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:             ≤2.5 mVrms (voltage output); ≤5 μArms (current loop

output)


Fault Detection:                 Open LVDT winding, cable disconnected, loss of excitation


Failure Indication:           Flashing LED’s; analog output out of range; open-collector

switch


Null Detection:                   Front panel LEDs


Null Output Signal:          Up to +/-3VDC


Operating Temperature:  0 to 75°C


Temperature coefficient:  +/-0.002% of FSO/C (combined zero and span shift)


Zero/Full Scale Set:          Front panel push button or RS-485 command


Digital Interface:                RS-485 2-wire multi-drop network, 16 addresses

Dimensions & Wiring

Warranty

NewTek products are warrantied against defective materials and workmanship for a period of one (1) year from the date of delivery to the original purchaser. NewTek accepts no liability for damages in the misuse of our products.

Contact NewTek Sensors to discuss your requirements