4-20 mA two-wire Coriolis flowmeter
Endress+Hauser's Promass E 200 Coriolis flowmeter claims the distinction of being the first to have two-wire 4-20 mA HART technology.
Endress+Hauser announces the Promass E 200 Coriolis flowmeter, which the company contends is the first Coriolis flowmeter with true two-wire 4-20 mA HART technology available commercially. The Promass E 200 uses the full 16 mA of measurement span without the need for excess adapters, power supplies or barriers.
This advanced meter design results in simplified integration into existing control systems, and allows the flowmeter to be used with DCS, PAS, PLC and other remotely operated controller systems. The 4-20 mA interface makes it easy to replace legacy flow sensors without any change in field wiring. In many cases, the unit can simply be dropped in to replace an existing flowmeter, without the need for additional hardware or rescaling of control systems.
The Promass E 200 Coriolis meter is safe because its two-wire technology enables it to be used in safe applications for Class 1 Division 1 locations. The Promass E200 has been submitted for a SIL-2 rating for critical applications and complies with NE43 (NAMUR) safety standards, including operating down to 3.6 mA in a fail-safe condition. Self-monitoring and error diagnostics are standard features that are designed in strict accordance with the specifications of NE107 (NAMUR).
The Promass E has built-in diagnostics, and displays clear English text errors and root causes on its local display in case of a fault. The flowmeter can also be commissioned and diagnosed with Endress+Hauser’s FieldCare software. If servicing is needed, the HistoROM function automatic data backup function ensures automatic reconfiguration of a repaired or new meter without the need for recalibration.
Promass E 200 simultaneously measures mass flow, fluid density and temperature. In addition to liquids like acids, alkalis, and solvents, it also measures most gases. The Promass E 200 measures mass flow and volume flow with 0.25% accuracy, and measures density with accuracy of 0.0005 g/cm3. It operates in process pressures of Classes 150 to 600 and process temperatures up to 284 °F.
The sensor is highly immune to external disturbances such as pipeline vibration, and is stable under changing process conditions such as pressure, density, temperature or viscosity.
Promass E 200 can be supplied in line sizes of 3/8 to 2 inches (DIN 8 to 50) with 904L Stainless Steel as a standard wetted material. Transmitter options include aluminium and stainless steels to meet various chemical, oil, gas, process, food, beverage and life sciences applications.
- Edited by Chris Vavra, Control Engineering, www.controleng.com