In high-performance adsorption dryers dew point can change during load variations, regeneration cycles or dryer faults. If the sensor output freezes during auto-calibration, the control system may miss the actual process condition. This is particularly critical when the dew point signal is used for alarms or demand-based regeneration.

The TDS501 was developed for continuous low dew point measurement without signal freezing. Its four-element measuring method enables auto-calibration while retaining process visibility. The dew point signal therefore remains available for continuous dryer monitoring, helping to prevent blind spots in demanding compressed air applications down to −70 °C Td.

A rising dew point can indicate saturated desiccant, leaks, valve problems, insufficient regeneration, clogged filters or oil carryover. Fast feedback helps detect these issues before wet compressed air reaches the process.

E+E sensors turn dew point into a usable control signal rather than merely a monitoring value. Filter concepts can be selected to balance protection and response time. Compact inline installation places the measuring point close to the process. Digital interfaces such as Modbus RTU make the signal available to PLCs, OEM controls, alarm systems and trend monitoring.

Compressed air systems are demanding measurement environments. Sensors can be exposed to pressure, oil aerosols, particles, temporary condensation and changing flow conditions. Robust sensor design is therefore essential for high system availability and low maintenance requirements.

E+E Elektronik combines pressure-tight stainless steel designs with application-specific protection concepts. Depending on the device, sintered stainless steel filters and configurable filter options protect the sensing elements. Wettable sensing elements in the TDS501 tolerate short periods of condensation and support reliable operation even when conditions temporarily deviate from the ideal range. For high-pressure applications, the EE371 offers pressure resistance up to 100 bar and a 360° swivelling front end for easy integration. For demanding measurements at very low dew points, the TDS501 combines stainless steel construction, IP65 protection and pressure resistance up to 80 bar. The compact EE355 and EE354 provide additional stainless steel solutions for compressed air systems and dryer monitoring where space, cost efficiency and straightforward integration are important.