Volumetric Flow
FUNCTIONS Batch / Filling Control
Standard Volume Gas Flow
Assurance Factor®
API Standard Volume, Net Oil
Tamperproof Lock Switch
OUTPUTS 2 x Analog
2 x Frequency / Pulse
2 x Digital Status
INPUTS 2 x Digital
1 x Analog
RS 485 / Modbus RTU
HART over Analog
DISPLAY Backlit Color LCD

The RHE28 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).  Multifunction capability provides real time mass and volumetric flow plus density and temperature indication with the option of connecting external sensors such as pressure transducers or precision densitometers for even greater measurement accuracy.  Features such as API Standard Volume correction and Net Oil calculation are available.  The RHE28 supports connection to any of the wide range of RHM series of mass flow sensors and can be supplied with a tamperproof switch for critical applications. When the unique Rheonik Assurance Factor® advanced diagnostics package is included, the RHE28 provides deep insight into measurement conditions for precise process control and optimization.

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  • Wall or pipe/ hook mount
  • Epoxy Coated Aluminum, IP65 / IP66
  • Operates RHM sensors in hazardous areas, RHE28 fits in Zone 2 / 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 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 – Back Lit 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


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


  • More insight into process and measurement conditions with Assurance View®
  • Assurance Factor® for proactive maintenance
  • Works with all Rheonik RHM flow sensors
  • Fast and easy setup using RHECom software
  • Remote electronics provides installation flexibility



Housing: 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)
Dimensions: 170 x 272 x 93 mm / 6.7 x 10.7 x 3.7 in
Display: Large high contrast backlit LCD 128 x 24. Screen changes color to indicate warning or error
Weight: 2.4 kg / 5.3 lb
Operation: 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


Rheonik Coriolis RHE28 Datasheet

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