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 with or without a display. 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.
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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
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