LPDT Series Loop-Powered Dew Point Transmitter

When equipment space is limited, you still need accurate, dependable moisture measurement. Whether you’re monitoring compressed air, natural gas, glove boxes, dryers, or OEM process equipment, reliable dew point measurement protects product quality and process performance.

The COSA XENTAUR™ LPDT™ Series is an ultra-compact, 2-wire loop-powered dew point transmitter designed for continuous online moisture monitoring. Featuring patented HTF™ aluminum oxide sensor technology, a configurable display, user-selectable engineering units, and optional weatherproof construction, the LPDT delivers dependable moisture measurements while minimizing installation space and maintenance requirements.

Why Choose the LPDT?

Benefits

Ultra-compact footprint
2-wire loop-powered transmitter
Patented HTF™ aluminum oxide sensor
Dew point measurement from -100°C to +20°C
Continuous online monitoring
Easy-to-read local display
User-selectable engineering units
Linear 4–20 mA output
Optional Modbus RS-485 communications
Weatherproof NEMA 4X / IP65 housing
Display and non-display models
Low long-term drift
Long sensor life
Easy PLC, DCS, and SCADA integration
Low maintenance
Ideal for OEM integration

Why HTF Technology?

The LPDT incorporates COSA XENTAUR’s patented Hyper-Thin-Film (HTF™) aluminum oxide sensor technology, providing:

Faster response
Lower sensor drift
Long-term measurement stability
Excellent repeatability
Extended calibration intervals
Long sensor life

Why Monitor Dew Point?

Continuous dew point monitoring helps:

Prevent corrosion
Improve product quality
Protect dryers
Increase compressor life
Reduce maintenance
Improve process efficiency
Protect downstream equipment
Ensure gas quality compliance

for dew point monitoring with Aluminum Oxide Sensors

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Manual

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Applications

Compressed Air Systems

Continuously monitor moisture to:

Verify dryer performance
Meet ISO 8573 compressed air quality requirements
Prevent corrosion
Protect pneumatic equipment
Reduce maintenance costs

Air Dryers

Optimize:

Refrigerated dryers
Desiccant dryers
Membrane dryers
Compressed air treatment systems

Plastic Dryers

Maintain proper resin drying to:

Improve product quality
Reduce defects
Increase production consistency

Natural Gas Processing

Measure moisture to:

Prevent hydrate formation
Protect pipelines
Meet gas quality specifications
Improve compressor reliability

Glove Boxes

Monitor ultra-dry atmospheres in:

Battery manufacturing
Pharmaceutical research
Materials science
Semiconductor support processes

Cleanroom & Controlled Environments

Verify moisture levels in:

Semiconductor cleanrooms
Pharmaceutical manufacturing
Electronics production
Controlled process environments

Cryogenic & Industrial Gases

Measure moisture in:

Nitrogen
Oxygen
Argon
Helium
Specialty gases
Air separation plants

OEM Equipment

Integrate into:

Air generators
Gas generators
Compressor packages
Process skids
Dryer manufacturers
Industrial automation equipment

Frequently Asked Questions

What is a loop-powered dew point transmitter?

A loop-powered dew point transmitter uses a standard 4–20 mA current loop for both power and signal transmission, simplifying installation while providing continuous moisture measurements.

What is the LPDT™ used for?

The LPDT is designed for continuous moisture monitoring in compressed air systems, industrial dryers, glove boxes, natural gas processing, cleanrooms, OEM equipment, and specialty gas applications.

What measurement range does the LPDT support?

The LPDT measures dew point from approximately -100°C to +20°C, making it suitable for both extremely dry and moderate industrial gas applications.