LPDT2 SERIES

Ultra-Compact LPDT2 SERIES LOW MAINTENANCE DEW POINT Transmitter

The COSA LPDT2™ is an ultra-compact, loop-powered (two-wire) dew point transmitter. Our LPDT2 is an ultra-compact, loop-powered (two-wire) dew point transmitter without a display (available now) or with a display (available in August 2022). LPDT2 with display is a fully functional instrument operated through a miniature custom LCD display and four push buttons, using the same user-friendly interface of all COSA Xentaur hygrometers.

Where a display at the point of measurement is not necessary, the LPDT2 is the answer. Modbus, and Analog outputs provide a simple and cost-efficient solution with the trusted results of our COSA Xentaur acclaimed LPDT.

THE LPDT2 WILL OFFER TWO TRANSMITTER VERSIONS

  • A transmitter with no display (blind) will provide all the measurement reliability users have come to expect from COSA Xentaur HTF aluminum oxide sensors without the additional expense of on-board transmitter control
  • A transmitter with a NEW 4 button display (available Aug 2022) will provide users with even more control than the original LPDT (3 button unit). View, select and set options within the transmitter. 

FEATURES INCLUDE

  • Loop Powered, with 4-20mA analog output
  • Data Logging outputs via MODBUS 485
  • User Selectable Settings for units of measure
  • 3 Field Adjustment options
  • NEMA 4 IP66 Housing
  • Display unit can be rotated to read upright
  • Optional Cl 1 Div 2 area rating (coming soon)

BENEFITS

  • Integrated HTF™ Sensor Technology
  • Display and no-display version available
  • Low-cost and easy maintenance
  • Weatherproof NEMA 4X IP66
  • Convenient logging feature
  • RS-485 Modbus Interface
  • Adjustable analog outputs
  • Very low drift
  • Long sensor life

CONFIGURATIONS

  • LPDT2-100 – general purpose and CL1 Div 2
  • LPDT2-B100 – general purpose and CL1 Div 2
  • LPDT2-65 – general purpose and CL1 Div 2
  • LPDT2-B65 – general purpose and CL1 Div 2




Cost Effective Loop-Powered (2-wire) Dew Point Transmitter

APPLICATIONS

  • Glove boxes
  • Clean room environments
  • Natural gas transmission
  • Hydrocarbon processing
  • Air dryers and compressors
  • Specialty air gases
  • Cryogenic
  • Air generators

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info@process-insights.com


Selectable User Settings may be controlled via an Optional Controller/Display mounted in the transmitter.  See chart below for available settings and control levels for both transmitter options.

Settings

LPDT

LPDT2 No Display (Modbus Controlled)

LPDT2  Display Controlled

Select Units of Measure for output reading (°C, °F, ppm V, lbs , g/m3)

Yes

no

Yes

Display up to Two Alternating Units of Measure

no

Yes

Lock and Unlock settings

Yes

no

Yes

Single Point Calibration, with a known gas value

no

no

YES NEW

Span Check Calibration

no

Yes

Offset Adjustment

no

YES NEW

YES NEW

Show Sensor Data (transmitter and sensor Serial number)

Yes

Yes

Test the 4-20mA out put

Yes

Yes

Customize the Scale on 4-20mA output

no

Yes

Rotating Front Panel

no

Yes

The LPDT2 uses our COSA Xentaur HTF aluminum oxide sensor. The breakthrough HTF moisture sensor technology represents advances in thin film and metal oxide sciences and offers significant performance advantages over all other aluminum oxide sensors.  The operating principle of the HTF aluminum oxide sensors is that a hygroscopic layer of aluminum oxide adsorbs or releases water molecules within its pores, depending on the water vapor pressure in its environment. The electrical capacitance of the aluminum oxide layer changes with the surrounding water vapor pressure. The electrical capacitance is measured between the aluminum core of the sensor and a porous conductive gold layer on the outside.  The advantages of the HTF sensor technology are a result of the proprietary manufacturing method in which the aluminum oxide layer is made to be hyper thin as well as extremely hygroscopic. This results in a very sensitive sensor with fast response.


Electronics

The compact LPDT2 dew point meter is a fully functional instrument operated through a miniature custom LCD display and three push buttons, using the same user friendly interface of all COSA Xentaur hygrometers.  The analog output is linear to the engineering units selected for display and is user configurable. A weatherproof cap is available for outdoor NEMA 4X (IP65) applications.

Sensor

The LPDT2 uses a COSA Xentaur Hyper-Thin-Film HTF™ aluminum oxide sensor. The breakthrough HTF sensor technology represents advances in thin film and metal oxide sciences and other significant performance advantages over all other aluminum oxide sensors. The operating principle of the HTF aluminum oxide sensors is that a hygroscopic layer of aluminum oxide adsorbs or releases water molecules within its pores, depending on the water vapor pressure in its environment. The electrical capacitance of the aluminum oxide layer changes with the surrounding water vapor pressure. The electrical capacitance is measured between the aluminum core of the sensor and a porous conductive gold layer on the outside. The advantages of the HTF sensor technology are a result of the proprietary manufacturing method in which the aluminum oxide layer is made to be hyper thin as well as extremely hygroscopic. This results in a very sensitive sensor with fast response.

High Capacitance Response

HTF sensors have a capacitance change, several orders of magnitude larger than that of conventional aluminum oxide sensors due to the hyper thin film, a sharp transition layer and a special pore geometry. Additionally, this change is quasi linear and its sensitivity to temperature is negligible. The advantages of a linear high capacitance response: better sensitivity, better repeatability and faster response times. Also, the measurement syst


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