Dew point sensor / transmitter for industrial drying processes

The compact EE355 dew point transmitter with a measuring range down to -60 °C (-76 °F) Td and outstanding price/performance ratio is dedicated for applications in compressed air systems, plastic dryers and industrial drying processes.

Inquire now

An integrated auto-calibration procedure leads to accuracy of ±2 °C (±3.6 °F) Td. The measured values for dew point, frost point or ppm volume concentration are available on an analog 4-20 mA and a digital Modbus RTU output. Integration into the measurement task is simplified by the compact design and the exceptionally robust stainless steel enclosure.

With an optional Modbus to USB convertor and the free EE-PCS configuration software the user can adjust the dew point transmitter, set the Modbus parameters, and change the scaling of the analogue output.

You want to know more about our products?
We are looking forward to help you.

Key Features EE355

  • Measurement range -60...60 °C Td (-76...140 °F Td)
  • E+E autocalibration Measurement accuracy ±2 °C (±3.6 °F)
  • Modbus RTU and 4..20 mA output
  • sturdy and compact stainless steel housing

Technical data EE355

  • -60...60°C (-76...140 °F) Td

    Measuring range
  • ±2 °C (±3.6 °F)

  • Modbus RTU and 4-20mA

  • 18-28 V DC


You want to know more about our products?
We are looking forward to help you.


  • What is the difference between Modbus RTU and Modbus TCP/IP?

    The main difference is the hardware interface. The Modbus RTU protocol runs on RS485 Hardware while Modbus TCP/IP protocol on Ethernet hardware.

  • What is the difference between dew point temperature and frost point temperature?

    The dew point temperature (Td) indicates where condensation begins. The frost point temperature (Td) indicates where icing begins.

  • Is the E+E dew point probe / sensing element wettable?

    Yes, the probe and the sensing element of all E+E dew point measurement devices is wettable.

  • Which E+E products are appropriate for low dew point measurement?

    Low dew point means the difference between the ambient temperature and the dew point temperature is higher than 40 °C (72 °F). This corresponds to RH < 5%.

    The appropriate products are the EE371 and EE355. Both devices feature an auto-calibration procedure.

  • What is the auto-calibration function at the E+E dew point measurement devices good for?

    The auto-calibration corrects periodically even the smallest drift of the capacitive sensor at very low relative humidity. This is neccessary for high accuracy and long term stability of the dew point measurement. The auto-calibration is performed every 30 minutes and takes approx. 3 minutes. During the auto-calibration, the output is frozen at the last measured dewpoint value.

  • Which E+E dew point measurement devices feature auto-calibration?

    Auto-calibration is used by EE371 and EE355.

  • What calibration certificate is included in the standard scope of supply of the E+E dew point sensors?

    The standard scope of supply of E+E dew point sensors includes an inspection certificate according DIN EN 10204 - 3.1. For details on calibration certificates please see page 5 in

  • Can E+E supply an accredited calibration certificate with the Dew point sensor?

    Accredited calibration certificate for dew point temperature is available upon request, please see our calibration website.

  • What is the difference between a 2 wire and a 3 wire current output?

    Transmitter with "two-wires" technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology "three-wires" the power supply is separate from current output: 2 wires are the power supply and third carry the signal.

You want to know more about our products?