Introduction
The Rheonik RHE 28 Coriolis Mass Flow Transmitter Universal Mount (RHE28) is a high-performance, multi-variable field transmitter engineered for precise flow measurement and advanced process control in demanding industrial applications. Housed in a robust epoxy-coated enclosure with protection ratings up to IP67, the RHE28 is specifically designed for reliable operation in harsh environments, including both standard industrial locations and hazardous areas classified as Zone 2. Leveraging Rheonik’s advanced signal processing technology, the unit delivers accurate real-time measurement and compensation capabilities, including API Standard Volume correction and Net Oil calculation, making it ideal for oil & gas, chemical, and energy sectors. Its versatile communication architecture and I/O configuration enable seamless integration into modern control systems, supporting both digital and analog interfacing for enhanced monitoring, diagnostics, and automation.
- High-accuracy measurement of Mass Flow, Volumetric Flow, Density, and Temperature
- Flexible output configuration: 2 × Analog, 2 × Frequency/Pulse, 2 × Digital Status signals
- Comprehensive input support: 2 × Digital inputs and 1 × Analog input
- Advanced communication interfaces: PC USB (RHECom), RS-485 (Modbus RTU), and HART over analog
- Integrated backlit color LCD for clear visualization and local configuration
- Certified for hazardous environments: ATEX/IECEx and CSA approvals
- Equipped with Rheonik Assurance Factor for enhanced measurement reliability and diagnostics
General Specifications
| 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. The screen changes color to indicate a 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 a 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 Outputs | Up to 2 x configurable pulse/frequency. 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) |
| Hazardous Area Approvals |
ATEX/IECEx for RHE in ordinary locations (code AS), RHM in all zones |
| Cable Entries | 2 x M16, 2 x M20 as standard |
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