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Rheonik RHE26 Coriolis Mass Flow Transmitter

Rheonik RHE26 Coriolis Mass Flow Transmitter

Table of Contents

Rheonik RHE26 Coriolis Mass Flow Transmitter is a small-footprint, low-cost transmitter designed for rack, panel, or DIN rail mounting in an indoor or enclosure environment.

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

Rheonik RHE26 Flow Transmitter Features

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

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  • General process flow measurement
  • Feedstocks and transfers
  • OEM applications


  • 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®

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General Specifications


IEC61554 panel mount housing. Lockable front cover and DIN rail mount options available

Enclosure Rating:

IP20 (front IP54 with optional lockable cover)

Ambient Temperature:

-20°C to +60°C  / -4°F to +140°F


Please refer to RHE26 Dimensions page


Large high contrast backlit LCD 128 x 24. Screen changes color to indicate warning or error


0.45 kg / 1 lb


3 x front panel operator buttons for all menu navigation and settings

Sensor Connection:

Pluggable cage clamp terminal strip. Cable available in lengths up to
100 m / 328 ft for connection to remote sensor

Analog Outputs:

1 x 4-20mA output, active or passive, compliant to NAMUR NE-43

Digital Outputs:

2 x configurable pulse / frequency / status (IEC 60946), max 10 kHz

Digital Inputs:

1 x configurable control input (IEC60946)

Power Supply:

12-24 VDC ±10%, 4W

Digital Data Communications:

Modbus RTU (RS485)
Connection to PC (USB) with Rheonik RHECom software

Hazardous Area Approvals:

ATEX / IECEx for RHE in ordinary locations (code AS), RHM in all zones

cCSAus for RHE in ordinary locations (code CS), RHM in all divisions

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RHECom Software

The RHE26 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 USB flash drive. RHEComFree allows full setup of transmitter parameters and includes a useful datalogging function for monitoring performance of the meter.

For a small one-time license fee, RHEComPro and RHEComPro+ offer additional insight and setup 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!

Electrical connection to transmitter compatibility

Electrical connection option selections are compatible with the transmitter range according to the following table. Note that economical blind front versions of some transmitters are available where displays and keypads are not required. The wide range of Rheonik sensors and transmitters provide tremendous options for system designers and end users alike.

Standard Operation Package (Part Number Code SO)

The RHE26 Standard Operation Package provides the following measurement and function features:

Mass flow is calculated using the Coriolis principle to provide a high accuracy Mass Flow measurement of the fluid flowing through an Omega Tube Coriolis Meter.

Temperature Measurement

Each Omega Tube Coriolis Sensor provides a temperature measurement from built in sensors.

Fixed and Calculated Density Function

The Fixed Density function allows to enter a fixed density value for volumetric flow calculations. The Calculated Density function allows density to be generated based upon process temperature. A base/reference density at a known temperature is entered for the fluid being measured along with a coefficient describing the change in density per temperature unit. The firmware in the transmitter calculates flowing density based upon this information to use for volumetric flow calculations.

Calculated Actual Volume Measurement for Liquids and Gas

Volume measurement is calculated by dividing direct mass flow measurement by the Fixed Density.

Standardized/Normalized Volume Measurement for Gas

This function calculates the volume of gas passing through the meter at standard conditions. The density of the gas at standard conditions is entered into the transmitter and the volume is calculated using this in conjunction with the flowing mass.

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