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Humidity & dew point transmitters are field-mounted or inline instruments that measure relative humidity, temperature, dew/frost point and derived moisture parameters (absolute humidity, mixing ratio, specific enthalpy) in compressed air, process gases, dryers, ducts and controlled environments. Using interchangeable capacitive, polymer (e.g., DRYCAP) or chilled-mirror sensing elements, often in pressure-rated probes, they continuously convert readings into multiple humidity formats and output them via analog signals (4-20 mA, 0-10 V), digital protocols (RS485 Modbus, Ethernet/PoE, WiFi) or local LCD/relay indication for monitoring, alarms and control integration.
They prevent moisture-related damage and quality failures by detecting excess humidity or dew point excursions that cause corrosion, condensation, freezing, product contamination or equipment malfunction in compressed air systems, dryers, cleanrooms, server rooms and cold chain storage. They enable verification of gas purity against specifications (e.g., ISO 8573-1), support predictive maintenance by flagging dryer or desiccant failures, and provide traceable, continuous data for regulatory compliance, process control and energy efficiency. Flexible probe formats and output options solve integration challenges across diverse installation points (duct, wall, inline) and legacy or networked BMS/PLC/SCADA systems.
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by E+E Elektronik
Intrinsically safe humidity and temperature transmitter for explosion hazard areas (gas and dust, up to zones 0/20), with a stainless steel housing, calculation of derived humidity parameters and two 4-20 mA 2-wire outputs.

by E+E Elektronik
High-end humidity and temperature sensor with analogue and digital outputs (RS485 Modbus RTU, Ethernet PoE Modbus TCP) and proprietary sensing element coating, for industrial applications up to 180 °C and 20 bar.

by Vaisala
Indigo500 series (Indigo510 and Indigo520) are universal transmitters hosting Vaisala Indigo-compatible smart probes, including HMP humidity/temperature probes and DMP dew point probes. They provide analog, relay and Ethernet outputs, an optional touchscreen, data logging and optional cloud connectivity.

by Panametrics
Intrinsically safe, compact, loop-powered moisture transmitter with display for gases and non-aqueous liquids in rugged industrial and hydrocarbon applications.

by Panametrics
Tunable diode laser absorption spectroscopy (TDLAS) analyzer for rapid, accurate moisture measurement in a variety of background gases, suitable for hazardous areas. Available as Aurora, Aurora TransPort (portable) and Aurora RM (rack-mount); the pages reference an Aurora H2O user manual.
by Shaw Moisture Meters
A 2-wire, loop-powered 4-20 mA dewpoint transmitter for trace moisture measurement in process gases and dry compressed air, using SHAW ultra high capacitance moisture sensing technology.
by Alpha Moisture Systems
Compact 2-wire 4-20 mA loop-powered transmitter for continuous trace moisture measurement in process gases and compressed air, using ultra-high capacitance aluminium oxide sensing. Available with Modbus RTU over RS485.
by Alpha Moisture Systems
Intrinsically safe version of the AMT dewpoint transmitter for continuous trace moisture measurement in hazardous areas.
by Michell Instruments
Rugged, loop-powered industrial dew-point transmitter series based on ceramic impedance sensing, measuring dew point in compressed air dryers and process gases, with intrinsically safe, explosion-proof and online hygrometer variants.
by Rotronic
Series of transmitters (e.g. HF4, HF5) measuring relative humidity and temperature and calculating dew/frost point and other psychrometric parameters, using interchangeable HygroClip2 probes or integrated probes, with analog and digital outputs.
by Shaw Moisture Meters
An intrinsically safe dewpoint transmitter certified to ATEX with CE and UKCA approvals, suitable for hazardous areas when used with a signal isolator. It outputs a linear 4-20 mA signal.
by Testo
Industrial humidity and temperature transmitter with interchangeable digital probes, outputting all relevant humidity parameters via analog, relay and optional Ethernet or Profibus. Suited to trace humidity, compressed air, drying and air-conditioning applications.
by Testo
Dewpoint transmitter for trace humidity measurement in compressed or dry air, measuring -45 to +30 °Ctd with a polymer humidity sensor and 4-20 mA output.