Emerson Micro Motion

Emerson Micro Motion

For over 30 years, Emerson’s Micro Motion has been a technology leader delivering the most precise flow, density and concentration measurement devices for fiscal applications, process control, and process monitoring.

Emerson’s Micro Motion Coriolis, density and viscosity technologies deliver superior flow measurement expertise while providing customers with the confidence and insight they need to continuously improve safety and efficiency in the most critical process applications.

The Micro Motion flow meter’s measuring tube comes in a variety of shapes, and vendors have sales pitches for each of them. So you’ll have to decide for yourself which suits your purposes best. The most common is the omega or “U” sensor.

Whatever the shape, the tube has a drive coil to vibrate the tube at a specific frequency. And at the inlet and outlet ends of the tube, you find pickoffs measuring this frequency.

If there’s no flow, then both pickoffs vibrate at the same frequency, creating identical waveforms. When you have a flow, it creates the Coriolis effect, a small twist that phase-shifts the waveforms from the pickoffs. Thus by measuring the amount of shift, you can calculate the mass flow rate.

And as for density, you’ll use the natural change of frequency that occurs in a change of fluid density. High density makes the frequency decrease, and low makes it increase. So you can use these changes to find the density of the product with great accuracy.

Specifications

Measuring Range

• 0-3000 kg/m3 (0-3 g/cc)

Density Accuracy

• ±0.1 kg/m3 (±0.0001 g/cc)

Equivalent to: ±0.05°API, ±0.02° Brix, ±0.1% ABV, ±0.01% Conc.

Temperature Accuracy

• BS1904, DIN 43760 Class ‘A’ (±0.15 ± 0.002 X T)°C

Flow Rate Accuracy

• ±5% of reading (10:1 turndown)

Accreditation & Standards

•  ISO17025, OIML R117-1, MID compliant

Safety Approvals

• ATEX, CSA, IECEx

(Intrinsically-safe and Explosion/Flame Proof)

Display

• two-line, LCD screen, Optical switch configuration

Outputs

• Standard: Time Period, 4-20mA, HART, Modbus RS-485
• Optional: FOUNDATIONTM Fieldbus, Wireless HART M

Protection Class

• Ingress Protection: IP66/67, NEMA4 EMC compliant with EN61326

Dimensions

• Standard Flange to Flange: 600 mm (24”)
• 7835/45 Retrofit Option: 1030 mm (40.5”)

Weight (Typical)

• 14 kg (31 lbs)

Features

• Achieve superior real-world performance with elevated and combined temperature and pressure calibration
• Ensure sample integrity with a flow-rate indication
• Reduce measurement errors and minimize negative installation effects with case RTDs that adjust for ambient temperature
• Rely on compliance and compatibility to global standards – NACE, NORSOK, MID, ISO/IEC 17025
• Quickly install and verify meter health with intelligent internal diagnostics
• Support multiple simultaneous protocols for connection to DCS, PLC and flow computers
• Expand usage with a hazardous area-approved, head-mounted transmitter that supports local configuration and display

Advantages of Emerson’s Micro Motion