S305 Dew Point Monitor
Dew Point Monitor with Alarm (–50 … 20 °C Td / –20 … +50 °C Td)
- Two measuring ranges available: –50 … +20 °C Td and –20 … +50 °C Td
- Accuracy of ±2 °C Td
- Plug & Play solution, ready to install
- 6 mm quick connection for compressed air
- LCD display with value and alarm indication
- Programmable pre-alarm and main alarm (2 relays)
- 4…20 mA output for PLC or SCADA systems
- Industrial IP65 housing, suitable for wall or panel mounting
Description

Maintain full control of the dew point in your compressed air system.
The S305 is a dew point monitor designed for continuous supervision of refrigerated dryers and compressed air treatment systems. Its precise measurement allows deviations to be detected before moisture causes costly operational consequences.
An inadequate drying level can lead to:
- Corrosion in piping and equipment
- Failures in pneumatic valves and cylinders
- Defects in painting processes
- Downtime and micro-stoppages that affect productivity
The S305 integrates display, alarms, and analog outputs into one compact unit, activating visual alerts and relays when the dew point exceeds the configured limits. This enables immediate action to protect both process quality and system integrity.
A practical, reliable, and ready-to-install solution to ensure dry and stable compressed air at all times.
Applications
Dew point monitoring in refrigerated dryers
Supervision in desiccant dryers
Quality control in painting and coating lines
Protection of pneumatic systems (valves, cylinders, actuators)
Compressed air systems in automotive, food, pharmaceutical, and general manufacturing industries
Installation in compressor rooms or critical points of the air network
Integration into PLC, SCADA, or centralized monitoring systems
Advantages
Continuous and reliable dew point measurement
Early detection of dryer failures
Reduces risks of corrosion and equipment damage
Prevents unplanned downtime and production losses
Configurable alarms with integrated relays
4…20 mA output for easy integration into industrial control systems
Compact and easy-to-install equipment (Plug & Play)
Low maintenance
High stability and repeatability in measurement
Robust housing for industrial environments

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Operational and Technical Specifications
The S305 has been designed to provide stability and reliability under real industrial conditions, ensuring accurate measurements when the recommended operating parameters are observed.
Operating conditions:
Working pressure: 0.3 … 1.5 MPa (up to 15 bar depending on model)
Medium temperature: –30 … +70 °C
Ambient temperature: –10 … +40 °C
Ambient humidity: 0 … 100 % RH (non-condensing)
Recommended minimum flow at sensor: > 2 l/min
Additional technical features:
- Polymer sensor with integrated measuring chamber
Optimized response time (t90):
–50 °C → –20 °C: 20 s
0 °C → –40 °C: 120 s
- Backlit graphic display
- Advanced configuration via S4C software through USB
- EMC protection according to IEC 61326-1
- Approximate weight: 520 g
Exchange calibration service available, allowing sensor replacement without shutting down system operation.


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