COSA Xentaur HTF Replacement Sensor


Intrinsically Safe Replacement Sensor COSA Xentaur HTF is certified for use in Class I Division II hazardous locations. The Xentaur Hyper-Thin-Film (HTF) AL2O3 Moisture Sensor Technology model XDT uses a Xentaur HTF Aluminum Oxide sensor. The Sensor Element XTR-65 Range: (-65ºC to 20ºC dp) Encapsulated in 100-micron sintered SS. The Standard Sensor Fitting 500psi / 34 bar 3/4″-16 & 14mm x 1.25mm Threads. It features high capacitance response, interchangeable sensors, and advanced mechanical sensor design.

NOTE: Minimum of $200 to order. 

Hazardous Area Rating

This product is currently out of stock and unavailable.

The COSA Xentaur HTF Intrinsically Safe Replacement Sensor is approved for use in Class I Division II hazardous environments. The model XDT of the Xentaur Hyper-Thin-Film (HTF) AL2O3 Moisture Sensor Technology utilizes a Xentaur HTF Aluminum Oxide sensor. The ground-breaking HTF sensor technology improves thin-film and metal oxide sciences and significantly outperforms all previous aluminum oxide sensors in terms of performance. The HTF aluminum oxide sensors operate on the idea that a hygroscopic layer of aluminum oxide adsorbs or releases water molecules inside its pores in response to the surrounding water vapor pressure. The aluminum oxide layer’s electrical capacitance varies in response to the surrounding water vapor pressure.

The electrical capacitance is measured between the sensor’s aluminum core and an external porous conductive gold coating. The advantages of the HTF sensor technology are due to the patented manufacturing process used to make the aluminum oxide layer exceedingly thin and hygroscopic. As a consequence, a highly sensitive sensor with a rapid reaction is created.


  • Class I Division II
  • Better repeatability
  • Longer sensor life
  • Less drift
  • Faster response
  • Negligible temperature coefficient
  • Sensors are freely interchangeable
  • Up to 600x more sensitive than conventional sensors
  • Field calibration with NIST traceable reference standards


Type:Hyper Thin Film high capacitance AL2O3
Dewpoint range:
XTR-65 -65°C to +20°C (-85°F to +68°F)
XTR-100 -100C to +20C(-1458°F to +68°F)
Capacitance:15 nF to 200 nF
Accuracy:± 2°C (±3.6°F) for -110° to 0° Dewpoint
± 3°C (±5.5°F) for - 0° to +20° Dewpoint
Repeatability:±0.5°C (±0.9°F)
Response time*:For a step change from -40°C to -60°C:
63% in 90 seconds
90% in 450 seconds
Temperature range:.-30°C to +70°C (-22°F to 150°F)
Sample Flow range
(linear velocity at 1 atm):.Static to 100 m/s
Storage temperature:-40°C to 50°C (-40°F to +120°F)
SpanCheck:Sensor saturates at dewpoint
above +20°C (+68°F)
Pressure operating range:Standard: 34 bar (500 psi)
Optional: 340 bar (5000 psi)
Mechanical connections:14mm x 1.25 mm threads, and
3/4”-16 threads (other threads available)
Electrical connections:Female BNC connector
Sensor cable:Coaxial cable (75Ω with maximum
capacitance of 50 pF/m).
Maximum cable length: 914 m (3000 ft)
* These response times are not directly comparable to
competitors data because of differences in measurement
methodology and data presentation. Please inquire for
detailed comparisons between Xentaur and other major
sensor manufacturers. Our sensors are significantly faster.


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