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

Brochure

Hyper-Thin-Film Technology

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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EMEA +49 69 20436910
China/APAC +86 400 086 0106

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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