RHE 28

Universal Mount

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). 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®


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 M20 as standard