Rheonik RHE 21 Coriolis Mass Flow Trasnmitter
Rheonik RHE 21 Coriolis Mass Flow Trasnmitter

Rheonik RHE21 Coriolis Mass Flow Transmitter

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The Rheonik RHE21 Flow Transmitter has an advanced function, explosion proof, field mount transmitter. With corrosion-resistant stainless steel enclosure and through-glass operation capability, the RHE21 is rated to IP67 and suitable for the most extreme of installation environments. In addition features such as API Standard Volume correction and Net Oil calculation are available.

  • 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®
Rheonik RHE 21 Coriolis Mass Flow Trasnmitter
Rheonik RHE 21 Coriolis Mass Flow Transmitter

Rheonik RHE21 Flow Transmitter Features

  • Wall or Pipe Bracket Mounting
  • Corrosion resistant housing in SS316 is available
  • Selectable Units for Mass, Volume, Density, and Temperature
  • Positive, negative, and net totalizers for both volume and mass flow
  • Two configurable pulse/frequency/status outputs – double pulse available
  • Two analog outputs
  • Two configurable digital status outputs
  • Outputs are also available as an intrinsically safe version
  • Configurable digital input
  • Analog input configurable for pressure or density
  • Advanced functions: Net Oil, Baume/Brix, % Solids, Standard Density and Standard Volume (API MPMS Ch. 11)
  • Modbus RTU and HART
  • Custody transfer lockout switch and seal point
  • Backlit Color LCD display and 3 behind-glass buttons with intuitive menu design
  • USB connection for PC running Rheonik RHECom software
  • Built-in Assurance View® Advanced Diagnostic Set – clear publication of measurement status with Assurance Factor® and/or color changing display
  • Password Protected Setup
  • Upload and download configuration files
  • Power consumption typically 3-4 W


  • General and critical process flows
  • Feed stocks and transfers
  • Custody transfer
  • Well head production
  • Offshore


  • Very compact highly accurate multifunctional flow measurement
  • IoT/ Industry 4.0 ready
  • Compatible with various Ethernet standards
  • Fast and easy setup using RHEComsoftware incl. data logging
  • Highly reliable thanks to self-diagnostic and Assurance Factor®

General Specifications

  • Housing: 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)
  • Dimensions: Depending upon construction type, please see the Dimensions page  (approx. 255 x 200 x 100 mm / 10 x 8 x 4 in)
  • Display: Backlit color LCD.  The screen changes color to indicate a warning or error
  • Weight: 8 kg (17.5 lb)
  • Operation: 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 are available
    • Uncertainty of analog outputs +/- 0.1% of reading, +/- 10µA
  • Digital Outputs:
    • Up to 2 x configurable status outputs (IEC60946)
    • Intrinsically safe versions are 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 the Part Number Code page
    • Others available on request

RHECom Software

The RHE21 transmitter is a fully featured device with many sophisticated functions and configuration is necessary for proper performance of these functions. RHECom software is available in three versions – Free, Pro, and Pro+. RHEComFree is available for download at no extra cost or on a USB flash drive. RHEComFree allows the full setup of transmitter parameters and includes a useful data-logging function for monitoring the performance of the meter.

For a small one-time license fee, RHEComPro and RHEComPro+ offer additional insight and set up convenience menus. RHEComPro includes data logging, trending, and broad diagnostic capabilities. RHEComPro+ takes flow meter management one step further with a revolutionary fully functioning simulator application. With the simulator, you can trial run your application from the convenience of your office, adjusting transmitter settings, setting alarms and filters, and creating transmitter configuration files for upload into the actual unit.

The simulator is also ideal for training – it exactly mimics the front panel of the instrument display and buttons when clicked and includes controls for adjusting flow, density, and temperature readings just like the unit was in line!

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