Rotronic Hygroflex5 HF5 EX ATEX & IECEx Hazardous Area Transmitter (Zone 1)

Rotronic Hygroflex5 HF5 EX ATEX IECEx Transmitter

Rotronic Hygroflex5 HF5 EX ATEX & IECEx Hazardous Area Transmitter

Rotronic Hygroflex5 HF5 EX ATEX & IECEx measures relative humidity and temperature HVAC transmitter achieves a high degree of accuracy that has rarely been seen before and is suitable for use in zone 1 hazardous areas.

In combination with advanced sensor technology and integration, the Rotronic Hygroflex5 HF5 Ex provides superb functionality, taking humidity, temperature and dew point measurement to a whole new level of performance and reliability (< 2 %rh / 0.3 K).

Based on Airchip 3000 technology, the unique features of the Rotronic Hygroflex5 HF5 EX such as the advanced sensor technology and integration provide superb precision and state-of-the-art functionality.

Typical applications and industries include HVAC, food industry, building services equipment, paper, textile and pharmaceutical.

Rotronic Hygroflex5 HF5 EX Hazardous area Humidity & Temperature Measurement HVAC Transmitter – product Benefits

  • Functional display – Display shows measurement values with trend indicators as well as having configuration possible via a keypad.
  • Proven housing – The robust, reliable aluminium housing offers protection class IP66 with both wall or duct mounting options available.
  • Power supply and outpts – The Rotronic Hygroflex5 HF5 features a 10…28 VDC power supply and two analogue outputs that can be freely selected and scaled.
  • Interchangeable probes – The different probes can be connected to suit the specific application and can be easily calibrated to the relevant explosive environment.

Rotronic Hygroflex5 HF5 EX – Explosion Protection Classes


Hazardous area temperature transmitterII 2(1) G Ex eb mb [ia Ga] IIC T5 Gb

Hazardous area temperature transmitterII 2(1) D Ex tb [ia Da] IIIC T80°C Db



Hazardous area temperature transmitterII 1/2 G Ex ia IIC T5 Ga/Gb

Hazardous area temperature transmitterII 1/2 D Ex ia IIIC T80 °C Da/Db


Hazardous area temperature transmitterII 1/2 G Ex ia IIC T5-T4 Ga/Gb Ex

Hazardous area temperature transmitterII 1/2 D Ex ia IIIC T80 °C…110 °C Da/Db

Rotronic Hygroflex5 HF5 transmitter

Key user functions of the Rotronic Hygroflex HF5 EX humidity and temperature transmitter include:

  • Relative humidity and temperature measurement
  • Dew Point and other psychrometric calculations
  • Interchangeable probe for easy maintenance
  • Wide choice of probes to satisfy every application
  • Low voltage and mains versions
  • Freely scalable analogue signals
  • Various digital outputs available
  • Available with metal housing

Rotronic HYGROFLEX5 HF5 EX Humidity And Temperature Transmitter

Product Specifications

Probe Accuracy Measurement Range Standard Output Scaling Weight Min. / Max. load Start-Up Current Consumption Trend Indicators
probe dependent probe dependent 0…1 V = -40…60 °C / 0…100 %rh 220g/500g V-signal: ≥1 kΩ/V / mA-signal: ≤500 Ω HF53/54/55/56: 3s, HF52: 60s HF52: max 40 mA Yes

Power Consumption Identification EXIdentification EX Housing Max. Air Velocity Type Of Output Signals Probe Material
HF52: max 40 mA II 2(1) G Ex eb mb [ia Ga] IIC T5 Gb

II 2(1) D Ex tb [ia Da] IIIC T80 °C Db

Aluminium/ABS 20 m/s at probe 0…1 V, 0…5 V, 0…10 V, 0(4)…20 mA PEEK

Rotronic Hygroflex HF5 EX Humidity & Temperature Probe

Rotronic Hygroflex HF5 probes measure humidity, temperature and also calculate dew/frost point.


  • Accuracy: ±2 %rh / ±0.3 K at 23°C ±5 K
  • Temperature limit at probe: -40…60 °C / 0…100 %rh
  • Range of application electronics: -40…60 °C / 0…100 %rh, -10…60 °C with LCD
  • Service interface
  • Adjusted at 23 °C and 10, 35, 80 %rh

Rotronic Hygroflex5 HF5 EX ATEX & IECEx Transmitter For Use In Zone 1 Hazardous Areas

ATEX IECEx rated transmitter

ATEX IECEx rated Rotronic transmitter

The Rotronic Hygroflex5 HF5 transmitter is suitable for use in Zone 1 hazardous areas providing intrinsically safe humidity and temperature measurement. The Hygroflex5 HF5 features a robust aluminium transmitter available with or without a display.

The hazardous area certification associated with the HF5 specifies the products suitability for use within ATEX and IECEx rated, zone 1 hazardous areas. These are the two most common international hazardous area classifications.

What Is CO2 & How Is It Measured ? – Rotronic HygroFlex5-EX ATEX Humidity & Temperature Sensors

Rotronic Hygroflex5 HF5 Ex Humidity  & Temperature hvac transmitter – probe options

Whether a simple plug and play probe is required to measure ambient conditions or a more sophisticated cable probe for high temperature or special applications, the options available for the Rotronic Hygroflex5 HF5 Ex mean most requirements can be met.

All Hygroclip2 probes can be individually calibrated and adjusted to increase measurement precision.

The range of Hygroclip2 probes available include:

Rotronic Hygroprobe2 Operating range: - 50...100 °C Housing: polycarbonate or stainless steel

Rotronic Hygroprobe2 Operating range: – 50…100 °C
Housing: polycarbonate or stainless steel

Rotronic Hygroprobe for special applications

Rotronic Hygroprobe for special applications Operating range: -100…200 °C and 0…100 bar (0…1450 PSI)
Variations: polycarbonate or stainless steel
(1): HF520 transmitter is not compatible with industrial metal probes


The pharmaceutical industry is one of the largest users of humidity measurement equipment. Most drugs are sensitive to variations in humidity and moisture levels, so these need to be considered and controlled using measurement instruments, probes and sensors for the final products to be consistent in quality and performance.

Humidity Measurement Applications

Humidity instruments are used to both control (transmitters) and monitor (transmitters or data loggers) these conditions during “accelerated conditions” drug testing.

Production machines, driers, tableters, and coaters are all sensitive to humidity – quality control requires machine monitoring, area monitoring and final product Equilibrium Relative Humidity (ERH) measurement.

Clean room environments are humidity critical – environmental monitoring system (EMS) and measurement is validated to conform with regulatory requirements.


View the current Rotronic catalogue :


T&D distribute Rotronic probes, instruments, transmitters, data loggers, indicators and sensors for the measurement of dew point, flow, air velocity, process pressure, carbon dioxide and temperature. Click an icon for further information…..


Rotronic - Dew Point Measurement

Low Dew Point

Rotronic - Flow Measurement

Flow & Air Velocity

Rotronic - Process Pressure Measurement

Process Pressure

Rotronic - CO2 Measurement

Carbon Dioxide

Rotronic - Temperature Measurement


➡ Did you know? T&D supply VEGA process instrumentation for pressure, level and point level (switching) measurement.

Data Sheets