Marmonix MFR-2201 Variable Area Metal Tube Flow Meter

The Marmonix MFR-2201 metal tube rotameter is a variable-area flow meter for liquid, gas or steam in DN15–DN150 lines. A magnet-coupled float in a conical metal tube drives a local scale and can output 4–20 mA with HART. Published options include 10:1 turndown (DN ≤100), IP65/IP67 enclosure, medium temperature −80 °C to +250 °C, normal accuracy ±2.5% (high-accuracy type ±1.5%), flange/thread/quick-coupling process connections and ExiaIICT1–T6. Browse all Marmonix rotameters, or see the MEF-8200 flanged mag flowmeter when the fluid is conductive and you need a full-bore magnetic meter instead.

Metal Tube Rotameter MFR-2201

Float flow meter MFR-2201 is made up of flow sensor and flow indicator. Float is placed vertically inside of conical measuring tube and can freely move up and down along the conical tube owing to hydrodynamic effects. A high-performance permanent magnet is set inside float, by this way the magnetic field around permanent magnet will change along with the float moving up and down. When fluid keeps a stable flow value and float locates in a dynamic balance state in position, the magnetic field around permanent magnet keeps constant also.The magnetic signal will be transmitted in non-contact form by means of the flow Indicator mechanically connected to conical tube. In another word, the indicator is able to detect and process flow value of liquid by magnetic drive system and finally the corresponding flow rate value can be read from the scale on site. Also it can indicate outputs as standard electrical signal (4-20) mA / hart communication protocol.

Metal Tube Rotameter MFR-2201 Features

Key MFR-2201 features at a glance:

• Diameter: DN15-DN150
• Range ratio:10:1 (DN≤100),5:1 (DN＞100)
• protection: IP65
• Viscosity:≤250 mPa.s
• Medium Temperature:-80℃~250℃

Metal Tube Rotameter MFR-2201 Specifications:

How metal-tube rotameters are used on plant utility lines

In a typical process or utility skid, operators want a local flow reading on a clean liquid or gas line, sometimes with a 4–20 mA signal to the control system, without the cost of a Coriolis or ultrasonic meter.

A metal-tube variable-area (VA) meter places a float in a vertical conical tube; as flow rises the float finds a new equilibrium height, and a magnetic follower outside the tube shows that height on a scale. ISO 5167 is not the VA standard, but plant practice for VA meters still requires a vertical install, adequate straight run, and fluids within the viscosity and density basis of the scale. ASME and vendor guidance for VA meters also stress full-bore, stable density and limits on pulsation.

Sizing starts from the design flow and density, picks a DN so normal flow sits in the upper half of the scale, and selects liner/float materials for the chemistry. Optional HART or 4–20 mA lets the same meter feed a DCS while the scale remains readable on site during a power loss.

Questions about the MFR-2201 metal tube rotameter

Which fluids can the MFR-2201 measure?

The MFR-2201 is listed for liquid, gas and steam. Viscosity limits depend on size (for example DN15 ≤5 or ≤30 mPa·s, DN25 ≤250 mPa·s, DN50–150 ≤300 mPa·s in the published table).

What sizes and outputs does the MFR-2201 offer?

Pipe sizes are DN15–DN150 with flange, thread or quick-coupling connections. The indicator can show local scale flow and can output standard 4–20 mA / HART. Power options include 24 VDC or a 3.6 V lithium battery.

What accuracy and protection does the MFR-2201 have?

Normal accuracy is ±2.5% with a high-accuracy type at ±1.5%. Enclosure protection is listed as IP65 and IP67, with an ExiaIICT1–T6 explosion-proof marking on the datasheet table.