Wide Dew Point Measurement Range
The measuring range from −80 to +20 °Ctd enables accurate measurement of residual moisture in compressed air and technical gases, even in extremely dry processes.
CS Instruments − FA 505
A new generation dew point sensor for reliable measurement of residual moisture in compressed air and technical gases, even in applications with extremely limited installation space.
| Measuring Range: −80 … +20 °Ctd |
| Accuracy: up to ±1 °Ctd |
| Output: 4–20 mA or Modbus RTU (RS-485) |
| Pressure Range: up to 50 bar (optional up to 350 bar) |
| Protection Class: IP65 |
| Measuring Range: −80 … +20 °Ctd |
| Accuracy: up to ±1 °Ctd |
| Output: 4–20 mA or Modbus RTU (RS-485) |
| Pressure Range: up to 50 bar (optional up to 350 bar) |
| Protection Class: IP65 |
- FA 505 Dew Point Sensor (–80 … +20 °Ctd)Dew point sensor for OEM applications (e.g. adsorption dryers). Includes inspection/test certificate. Output: 4–20 mA (2-wire connection) or Modbus RTU (RS-485).
| Parameter | FA 505 |
|---|---|
| Application | Dew point / residual moisture measurement in compressed air and gases |
| Dew Point Measuring Range [°Ctd] | –80 … +20 (optional: –60 … +30 / –20 … +50) |
| Accuracy (+50 … –20 °Ctd) [°Ctd] | ±1 |
| Accuracy (–20 … –50 °Ctd) [°Ctd] | ±2 |
| Accuracy (–50 … –80 °Ctd) [°Ctd] | ±3 |
| Pressure Range [bar] | –1 … 50 (special version up to 350) |
| Power Supply [VDC] | 24 (10 … 36) |
| Protection Class | IP65 |
| EMC | According to DIN EN 61326-1 |
| Operating Temperature [°C] | –20 … +70 |
| Electrical Connection | M8, 4-pin |
| PC / Service Connection | Modbus RTU (RS-485) |
| Output | 4–20 mA (2-wire) or RS-485 (Modbus) |
| Analog Output Load [Ω] | < 500 |
| Thread Connection | G 1/2″ |
| Units (via Service Software) | %RH, °Ctd, g/m³, mg/m³, ppm V/V |
| Scaling | 4–20 mA output scaling configurable via software |
| Housing Material | Zinc alloy |
| Sensor Protection | 50 μm sintered stainless steel filter |
Why Choose the FA 505?
Long-Term Stability and Reliability
The sensor offers outstanding long-term stability, is resistant to condensation, and is suitable for continuous industrial operation without frequent recalibration.
Fast Response Time
Optimized sensor technology ensures rapid response to dew point changes, enabling immediate detection of dryer system failures.
Optimized for Limited Installation Space
Its compact design is specifically developed for OEM applications and installation in dryers where space constraints are critical.
Analog or Digital Output
Available with either a 4–20 mA analog output (2-wire technology) or an RS-485 Modbus RTU interface for easy integration into monitoring systems.
Advanced Sensor Diagnostics
The new generation electronics enable local sensor diagnostics via a handheld instrument or CS Service Software, simplifying commissioning and maintenance.
Suitable for High-Pressure Applications
The standard version is rated up to 50 bar, while special versions allow operation up to 350 bar, making the sensor suitable for demanding high-pressure applications.
Flexible Measurement Scaling
Various measurement units can be selected via software (°Ctd, g/m³, ppm, mg/m³, %RH), and the 4–20 mA output scaling can be customized.
Compressed Air
Drying SystemsAccurate dew point monitoring in compressed air systems downstream of adsorption, membrane, and refrigeration dryers with limited installation space, ensuring air quality and equipment protection.
Industrial Gases
N2, O2, H2, ArReliable measurement of residual moisture in technical gases such as nitrogen, oxygen, hydrogen, and argon, even at extremely low dew points and high pressures.
Process Industry
Reliable MonitoringContinuous dew point monitoring in process applications where moisture control is essential for process stability, product quality, and safe operation.
Measuring devices
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Supply, installation, calibration, and service
Where to find us
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Choose the right dew point sensor or meter for monitoring residual moisture in compressed air and technical gases. The portfolio includes fixed-installation probes, ATEX versions, and portable service instruments.
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FA 505
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