CS Instruments FA 510/515 – Dew Point Sensor for Compressed Air & Gases

Overview

Industrial Dew Point Measurement

The CS Instruments FA 510/515 Dew Point Sensor is engineered to deliver reliable and continuous dew point monitoring in compressed air systems, process gas lines, and industrial dryers. Designed for both adsorption and refrigeration dryer applications, this sensor enables precise measurement of residual moisture — a critical parameter for maintaining system efficiency, preventing condensation, and protecting equipment from corrosion or process disruption. 

Whether used in compressed air after dryers, membrane systems, or in technical gases such as oxygen, nitrogen, or argon, the FA 510/515 provides accurate, drift-resistant measurement with excellent long-term stability. 

Core Features & Technology

Precision Dew Point Measurement

Using advanced humidity sensing and evaluation electronics, the FA 510/515 produces accurate dew point readings in multiple formats, including pressure dew point [°Ctd] and atmospheric dew point [°Ctd.atm]. 

Versatile Output Interfaces

• 4…20 mA analogue output for direct integration with PLC/DCS and process controllers

• Optional Modbus-RTU (RS-485) digital communication for remote monitoring, diagnostics, and advanced data retrieval

  Both FA 510 (3-wire) and FA 515 (2-wire) versions support flexible installation options. 

Wide Measured Parameters

Through the Modbus interface, users can read multiple humidity and gas parameters, such as:

• Dew point (pressure and atmospheric)

• Temperature (°C)

• Relative humidity (%RH)

• Absolute humidity (g/m³)

• Humidity fraction (g/kg)

• Moisture content (ppm V/V)

• Partial vapor pressure (hPa) 

Sturdy Industrial Design

• Condensation-resistant sensor element for stable and reliable performance

• Fast adaptation time from dry to wet conditions

• IP66 protection class for robust industrial operation

• Pressure tolerance up to ~50 bar in standard versions and optional higher pressure models available

• Threaded process connections (e.g., G1/2″, NPT, UNF) for versatile installation 

Typical Industrial Applications

The FA 510/515 Dew Point Sensor is widely used in:

• Compressed air systems (after adsorption, membrane, or refrigeration dryers)

• Industrial gas process lines (oxygen, nitrogen, argon)

• Plastics industry (granulate dryer moisture measurement)

• HVAC & pneumatic systems

• Process quality assurance and leak detection setups 

By accurately measuring residual moisture and dew point, this sensor helps enhance system efficiency, reduce corrosion and contamination risks, and increase equipment uptime.

Technical Specifications 

FAQ

What is a dew point sensor?

A dew point sensor measures the temperature at which moisture in a gas or air condenses into liquid. This is vital for preventing condensation and ensuring efficient operation of pneumatic systems and dryers. 

What’s the difference between FA 510 and FA 515?

The FA 510 uses a three-wire connection for power and signal, while the FA 515 uses a two-wire connection; both provide 4…20 mA output and optional Modbus-RTU. 

Can this sensor measure other humidity parameters besides dew point?

Yes — using the Modbus interface, it can report multiple parameters including relative humidity, absolute humidity, moisture content, and partial vapor pressure. 

Is the sensor suitable for harsh industrial environments?

Yes — with IP66 protection, condensation-resistant design, and robust sensor technology, it works reliably in industrial compressed air systems. 

Call to Action

Enhance your compressed air and gas system performance with the CS Instruments FA 510/515 Dew Point Sensor — contact Seven Star LLC for quotes, calibration options, integration support, and technical details.