Intrinsically Safe

HL-750 Series

ETL and CE Marks

The NewTek NT-HL-750 series LVDT sensors are made for use in hazardous and explosive environments.  Approved by Intertek Testing Laboratories and carrying the ETL mark as intrinsically safe for use in Class I, Zone 0 & Zone 2, the NT-HL-750 series LVDTs operate safely and accurately in hostile environments with the presence of flammable or ignitable gases and liquids such as those found in refining and petrochemical plants, pipelines, and oil and storage tanks.  Constructed using stainless steel and hermetically sealed to IP-67, the NT-HL series is rugged and robust with excellent protection against hostile environments.  Electrical connections are made via lead wires exiting from a 1/2″ NPT fitting making for a easy installation into hard conduit.

Input Voltage:                   3 Vrms (Nominal)
Input Frequency:              2.5 kHz
Linearity:                           ± 0.25% Full Range Max
Hysteresis:                        <0.01% of Full Range Typical
Repeatability:                   <0.01% of Full Range Typical

Operating Temperature:          -29° C to 100° C  (Zone 0);                                                                                                                      -29°C to 150°C (Zone 2)
Thermal Coefficient:                <-0.014%/°F (< -0.025%/°C) of Full Range
Shock Survival:                         1000 g, 11 ms
Vibration:                                  20 g to 2 KHz

Core:                  Hi-permeability nickel-iron alloy
Connector:        1/2″ Conduit Fitting w/ 6.5 ft lead wires

Hazardous Location Markings



Class I Zone 0 AEx ia IIB T3 Ga
Class I Division 1 Group C, D T3
Ex ia IIB T3 Ga
-29.89°C ≤ Ta ≤ 100°C

Class I Zone 2 AEx ic IIB T3 Gc
Class I Division 2 Group C,D T3
Ex ic IIB T3 Gc
-28.29°C ≤ Ta ≤ 150°C

Intrinsically Safe, Securite Intrinsique Exia

Entity Parameters: Ui = 9 VAC, Ii = 100 mA Pi = 200 mW, Ci = 0 Li = 11.1 mH


  • Approved for use in hazardous/explosive environments
  • Both axial and radial options available
  • Welded 3/4 inch hermetically sealed steel housing
  • 1/2″ NPT fitting w/ lead wires for easy conduit installation
  • Measurement ranges from  ±1.0 to ±10 inches
  • Linearity ±0.25% of Full Range Max
  • Withstands shock and vibration


  • Pipeline Monitoring
  • LNG Storage Tanks
  • Oilfield Equipment
  • Petrochemical Process Control
  • Gas Turbines
  • Power Generation


Dimensions & Wiring



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