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Have a live application? Use our Flow Questionnaire and Rheonik Product Brochure to get started:

View ABLE Flow Questionnaire – Email back to [email protected]

View Rheonik Product Brochure

ABLE are Rheonik’s Exclusive Representative for Sales and Service in the UK and Ireland and can assist you and your customers in the following areas:

  • Assistance in meter sizing
  • Offer after sales support, service and re-calibration utilising our in-house expertise
  • Offer Coriolis Mass Flow Meter product training from our state-of-the-art training rig either in-person or via video call.

Further to the above, ABLE can offer custom solutions based on your individual requirements. Email us now at [email protected]

Rheonik RHE 21 Ex d Field Mount Coriolis Mass Flow Transmitter

ABLE Instruments are Rheonik’s Exclusive Representative for Sales and Service in the UK and Ireland, including the RHE 21 Ex d Field Mount Coriolis Mass Flow Transmitter. The Rheonik RHE 21 is not just a transmitter; it’s an advanced function, explosion-proof marvel meticulously engineered for field-mount installations. It boasts a corrosion-resistant stainless steel enclosure that can endure even the harshest conditions, ensuring longevity and precision in extreme environments. With its IP67 rating, it’s more than suitable; it’s exceptional.

This transmitter goes beyond the ordinary. It features through-glass operation capability, allowing you to access and control it while maintaining its integrity in hazardous areas. In addition, it offers features like API Standard Volume correction and Net Oil calculation, making it a powerful asset for industrial applications.


  • Measure Mass Flow, Volumetric Flow, Density and Temperature
  • Outputs 2 x Analog, 2 x Frequency/Pulse, 2 x Digital Status
  • Inputs 2 x Digital, 1 x Analog
  • PC USB for RHECom, RS 485 for Modbus RTU, HART over Analog
  • Backlit Color LCD
  • ATEX/IEC Ex, CSA approved
  • Rheonik Assurance Factor

When it comes to measurements, the RHE21 Coriolis Mass Flow Transmitter excels. It precisely measures mass flow, volumetric flow, density, and temperature, providing critical data for precise control and monitoring in various industries. For comprehensive data reporting and control, it offers multiple outputs, including 2 x Analog, 2 x Frequency/Pulse, and 2 x Digital Status. Moreover, it supports inputs like 2 x Digital and 1 x Analog, further enhancing its utility in process automation.

Connectivity is effortless and reliable, with options like PC USB for RHECom, RS 485 for Modbus RTU, and HART over Analog. These interfaces ensure seamless integration with existing control systems, promoting efficiency and data accuracy. User-friendliness is a priority. The optional backlit colour LCD not only enhances visibility but also simplifies data interpretation in varying lighting conditions, ensuring ease of operation.

Safety and compliance are paramount, and the Rheonik RHE21 is certified to meet ATEX/IEC Ex and CSA standards, underscoring its reliability and adherence to industry safety regulations. With the Rheonik Assurance Factor, you can trust that the RHE21 transmitter consistently delivers reliable and accurate measurements, promoting confidence and precision in your industrial processes.

In conclusion, the Rheonik RHE21 Ex d Field Mount is an explosion-proof, advanced function transmitter designed for extreme environments. Its precision, versatility, connectivity options, and commitment to safety make it an optimal choice for industries seeking reliable and robust solutions to enhance their control and monitoring systems, especially in challenging conditions.

Have a particular application / project in mind? We’d welcome a call on +44 (0) 1189 169 420, or email us now at [email protected]

Why choose Rheonik Coriolis Mass Flow Meters? Unlike other Coriolis Meters, the patented Omega tube design of Rheonik Coriolis meters has solutions for operation up to 1722 bar (24,969 psi) line pressure at a precision of 0,05% and with renowned mechanical reliability. With highly accurate mass flow measurement performance and extreme capabilities, Rheonik meters are the ideal choice for many applications and quickly provide payback through improved product quality and greatly reduced maintenance. Whether used for transfer batching, process feed or control, Rheonik Coriolis Mass Flow Meters provide online precise flow and density measurement.

RHE 21 Specifications:

Stainless steel. Optionally all 316 stainless steel
Enclosure Rating
IP66 / NEMA 7X
Ambient Temperature
-40 to +60°C / -40 to +140°F (reduced visibility below -20°C / -4°F)
Depending upon construction type, please see Dimensions page of datasheet
(approx. 255 x 200 x 100 mm / 10 x 8 x 4 in)
Backlit colour LCD.  Screen changes colour to indicate warning or error
8 kg (17.5 lb)
3 x behind-window capacitive sensors for menu navigation / settings
Sensor Connection
Integral sensor cable with 3m or 10m length or optional IS terminal box for separate custom length sensor cable connection
Analog Outputs
Up to 2 x 4-20mA outputs, active or passive
Intrinsically safe versions available
Uncertainty of analog outputs +/- 0.1% of reading, +/- 10µA
Digital Outputs
Up to 2 x configurable status outputs (IEC60946)
Intrinsically safe versions available
Pulse/Frequency Outputs
Up to 2 x configurable pulse/freq. outputs (IEC60946), max 10 kHz
Digital Inputs
Up to 2 x configurable control inputs (IEC60946)
Analog Input (optional)
1 x 4 – 20 mA analog input (active) for two-wire external sensor
Power Supply
100-240 VAC (48 to 62 Hz) or 12-24 VDC +/- 10%, max. 6W
Digital Data Communications
Modbus RTU (RS485)
Connection to a PC (USB) with Rheonik RHEComPro software
HART over analog output

Cable Entries for Power and I/O

Type E* two M16 x 1.5 entries with Ex e glands 4-11mm (standard)
Type E3, E4, E5, EP optional ½” NPT, ¾” NPT, M20 x 1.5, M25 x 1.5
Type H* two ½” NPT

Hazardous Area Approvals
For ATEX / IEC Ex and cCSAus please see Part Number Code page
Others available on request
Purchase Product

Price: POA Contact 247ABLE