Introduction
The Rheonik RHE 21 Coriolis Mass Flow Transmitter Ex d Field Mount is an advanced, explosion-proof field instrumentation solution engineered for high-accuracy flow measurement and process control in hazardous and demanding industrial environments. Housed in a robust, corrosion-resistant stainless steel enclosure with through-glass operation capability, the unit is designed to maintain full functionality without compromising explosion protection integrity. With an IP67 protection rating, it ensures reliable performance under extreme environmental conditions, including exposure to moisture, dust, and aggressive process media. The transmitter integrates advanced computational features such as API Standard Volume correction and Net Oil calculation, making it highly suitable for oil & gas, petrochemical, and custody transfer applications where precision and compliance are critical.
- Multi-Parameter Measurement Capability: Simultaneously measures mass flow, volumetric flow, density, and temperature with high accuracy for comprehensive process monitoring.
- Flexible Output Configuration: Equipped with 2 × analog outputs, 2 × frequency/pulse outputs, and 2 × digital status outputs to support diverse control and monitoring systems.
- Versatile Input Channels: Includes 2 × digital inputs and 1 × analog input, enabling integration with external sensors and control signals.
- Advanced Communication Interfaces: Supports PC USB connectivity for RHECom configuration, RS-485 for Modbus RTU communication, and HART protocol over analog signals for seamless system integration.
- Enhanced User Interface: Features a backlit color LCD for clear visualization of process parameters and easy on-site configuration.
- Global Hazardous Area Certifications: Fully compliant with ATEX/IECEx and CSA standards, ensuring safe operation in classified hazardous locations.
- Rheonik Assurance Factor: Incorporates proprietary Rheonik technology to enhance measurement reliability, accuracy, and long-term stability in critical applications.
General Specifications
| Housing | Stainless steel. Optionally, all 316 stainless steel |
| Enclosure Rating | IP66 / NEMA 7X |
| Ambient Temperature | -40 to +60°C / -40 to +140°F (reduced visibility below -20°C / -4°F) |
| Dimensions | Depending upon construction type, please see the Dimensions page (approx. 255 x 200 x 100 mm / 10 x 8 x 4 in) |
| Display | Backlit color LCD. The screen changes color to indicate a warning or an error |
| Weight | 8 kg (17.5 lb) |
| Operation | 3 x behind-window capacitive sensors for menu navigation/settings |
| Sensor Connection | Integral sensor cable with 3m or 10m length, or optional IS terminal box for separate custom length sensor cable connection |
| Analog Outputs |
Up to 2 x 4-20mA outputs, active or passive |
| Digital Outputs |
Up to 2 x configurable status outputs (IEC60946) |
| Pulse/Frequency Outputs | Up to 2 x configurable pulse/freq. outputs (IEC60946), max 10 kHz |
| Digital Inputs | Up to 2 x configurable control inputs (IEC60946) |
| Analog Input (optional) | 1 x 4 – 20 mA analog input (active) for two-wire external sensor |
| Power Supply | 100-240 VAC (48 to 62 Hz) or 12-24 VDC +/- 10%, max. 6W |
| Digital Data Communications |
Modbus RTU (RS485) |
| Cable Entries for Power and I/O |
Type E* two M16 x 1.5 entries with Ex e glands 4-11mm (standard) |
| Hazardous Area Approvals |
For ATEX / IEC Ex and cCSAus, please see the Part Number Code page |
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