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Rheonik RHE28 Coriolis Mass Flow Transmitter

Rheonik RHE28 Coriolis Mass Flow Transmitter

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Rheonik RHE28 Coriolis Mass Flow Transmitter is an advanced function transmitter in a rugged epoxy-coated enclosure designed for field mounting. With enclosure ratings up to IP67, the RHE28 has the flexibility to be installed in both ordinary and hazardous areas (Zone 2). Features such as API Standard Volume correction and Net Oil calculation are available.

  • Measures 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 RHE28 Flow Transmitter Features

  • Wall or pipe/ hook mount
  • Epoxy Coated Aluminum, IP65 / IP66
  • Operates RHM sensors in hazardous areas, RHE28 fits in Zone 2 / Div. 2 areas
  • 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 configurable analog outputs
  • Two configurable digital status outputs
  • Two configurable digital inputs
  • Analog input for pressure or density
  • Advanced functions: Net Oil, Baume/Brix, % Solids, Concentration, Standard Density and Standard Volume (API MPMS Ch. 11)
  • Connectivity to control systems through Modbus RTU and HART
  • Custody transfer version with lockout switch and seal point
  • Simple user interface – Backlit Color LCD display and 3 operator buttons with intuitive menu design
  • Quick service & settings via USB / PC
  • Built-in Assurance View® Advanced Diagnostic Set – simple publication of measurement status with Assurance Factor® and/or color changing display
  • Password Protected Setup
  • Upload and download of configuration files
  • Power consumption less than 5 W

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  • General process flow measurement
  • Batching and Mixing
  • Feed stocks and transfers
  • Custody transfer
  • Allocation metering


  • 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


Epoxy coated cast aluminum universal field mount enclosure

Enclosure Rating:

IP65 / NEMA 4.  Optionally IP66 / NEMA 4

Ambient Temperature:

-20°C (optionally -40°C) to +60°C / -4°F (-40°F) to +140°F

(reduced visibility below -20°C)


170 x 272 x 93 mm / 6.7 x 10.7 x 3.7 in


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


2.4 kg / 5.3 lb


3 x behind-window capacitive sensors for menu navigation / settings

Sensor Connection:

Cage clamp terminals.  Cable available in lengths up to 100m for connection to remote sensor

Analog Outputs:

Up to 2 x 4-20mA outputs, active or passive, compl. to NAMUR NE-43

Digital Outputs:

Up to 2 x configurable status outputs (IEC60946)

Pulse/Frequency Output:

Up to 2 x configurable pulse/frequ. outputs (IEC60946), max 10 kHz

Digital Inputs:

Up to 2 x configurable control inputs (to IEC60946)

Analog Input (optional):

1 x 4-20mA analog input (active) for two-wire pressure or density sensor

Power Supply:

100-240 VAC +/- 10%  (48 to 62 Hz), 5W or 12-24 VDC +/- 10%, 4W

Digital Data Communications:

Modbus RTU (RS485)
Connection to PC (USB) with Rheonik RHECom software
HART over analog output

Hazardous Area Approvals:

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

ATEX/IECEx for RHE in zone 2 (code AB, A2), RHM in all zones

cCSAus for RHE in ordinary locations (code CS), RHM in all divisions cCSAus for RHE in Div. 2 (code CB, C2), RHM in all divisions

Cable Entries:

2 x M16, 2 x M25 as standard. Optional metric and NPT available

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Power Supply Options

The RHE28 can be configured with one of three power supply options:

  • Universal AC Power – 100-240 VAC ±10% (48 to 62 Hz) (Part Number Code A1)
  • Wide Tolerance DC Power – 12-24 VDC ±10%, 4W (Part Number Code D1)
  • Dual Supply – 100-240 VAC ±10% (48 to 62 Hz) / 12-24 VDC ±10%, 4W (Part Number Code U1) This unique option provides inputs for simultaneous connection of both a universal AC and separate DC supply. The transmitter utilizes AC power when available but will switch to the DC supply in the event of AC power outage. The DC supply can be a battery source. As an example, an RHE27 transmitter and connected sensor will operate for 10 days or more on a typical automobile battery.

RHECom Software

The RHE28 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!

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