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
Enclosure Material | Coated cast aluminum universal field mount enclosure |
Enclosure Rating | IP65 / NEMA 4. Optionally IP66 / NEMA 4X |
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 front panel operator buttons for all menu navigation and 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/Freq/Status Outputs | Up to 2 x configurable pulse/frequency/status 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 (48 to 62 Hz), 5 W and/or 12–24 VDC ±10%, 4 W |
Digital Data Communications: | Modbus RTU (RS485) |
Hazardous Area Approvals | ATEX / IECEx: RHE in ordinary locations or Zone 2, RHM in all zones cCSAus: RHE in ordinary locations or Division 2, RHM in all divisions (see datasheet) |
Cable Entries | 2 x M16, 2 x M20 as standard Optional metric and NPT entries available |
Sensor and transmitter must have matching approvals (see datasheet).






