Metal Tube Variable Area Flowmeter – MT28


isolvMeasuring Principle

iSOLV MT28 VA flowmeter measures volumetric flow rate of liquid and gases that operates on the float principle. It features a tapered metal tube, in which a float is allowed to move freely up and down. The float reaches a stable position when the upward force exerting by the flowing liquid equals the weight of the float. The float position is transmitted by a magnetic coupling system to the scale. The rotational movement of the follower magnet system transmitted to the indicator is linearised and the flow rate is indicated directly on the scale.



  • Various wetted materials are available (Stainless steel, PTFE and Hastelloy C) for process mediums.
  • Die-cast aluminum housing with epoxy paint for indicator housing (IP65), also optionally available in stainless steel.
  • Vertical, horizontal & side mounted version for special installation positions.
  • Modular rack housing accommodate all electrical functions and scale plate, modules of electrical options can be replaced or retrofitted without interrupting the process.
Special Options
Limit Switches • 2 limit switches
• Adjustable on the scale (Can be
Electrical Current Output, CUR Non-interacting and hysteresis-free
conversion of the flow value into a
scaled current output,
4-20 mA with HART
Flow Totaliser, FT • Used in conjunction with CUR
High Temperature, HT • Meter with built-in electrical components is
mounted on extended spacers if process
temperature should exceed the max.
allowable level
Inlet Needle Valve, TE • Connected at the inlet of flow meter
• Used for on-off, throttling and regulating
Outlet Needle Valve, TA • Connected at the outlet of flow meter
• Same purpose as TE
Inlet Differential Pressure, IR Help to maintain a constant flow rate at
variable inlet pressure
Outlet Differential Pressure, OR Help to maintain a constant flow rate at variable outlet pressure

• For liquid (both conductive and non-conductive) and gas measurement

• MT28 is particularly suitable for difficult applications and tough environmental conditions.

For example
High temperature, high pressure as well as corossive environment. Can be used in all industrial sectors, for example:

• Chemical

• Waster / Wastewater

• Marine / Offshore

• Pulp and Paper

• Pharmaceutical

• Food and Beverage

• Oil and Gas

Technical Details
Measuring Range (100% Value)
Water (20°C) 25 to 100 000 l/h
Air (1.03 bar abs. 20°C) 0.7 to 600 m3/h
Turndown Ratio 10:1
Accuracy Class
VDI/VDE Code 3513, Part 2 1.6
Flow Scale Flow units
Ambient Temperature Ta -40°C to +120°C
Max. Process Temperature
Tp Without built-in electrical
MT28/SS, MT28/HC: -80 °C to +300°C
MT28/PT : -80°C to +70°C
Max. Process Temperature
Tp With Built-in Electrical
Refer to Sales
Test Pressure PT
(Pressure Tested)
The test pressure is calculated in accordance with pressure
equipment directive (97/23/EC) and/or AD 2000-HP30, in
compliance with the maximum allowable operating pressure
and the maximum operating temperature
Meter Size DN15 to DN100 and ½” to 4”
Flange DIN2501 DN15 – 100, PN16 - 250
ANSI B 16.5 ½” – 4”, 150 – 2500 lbs
JIS B 2238 15 – 100, 10 – 20K
Thread ISO 228 G½” – G1”
ANSI B1.20.1 ½” - 1” NPT >50 bar
Sanitary Tri-Clamp ISO 2852 Size 25 -139, 10 – 16 bar
SMS 1146 1” – 4", 6 bar
DIN 11851 DN15 – 100, 25 – 40 bar
Higher pressure rating and other types of connection available on request
Flanges SS316L (1.4404) (Standard)
Hastelloy C
Wetted Parts SS316L (1.4404) (Standard)
Wetted Parts SS304 (1.4301) with PTFE liner
Hastelloy C
Housing Die cast aluminum with epoxy paint
Optional: Stainless steel housing
Measuring Tube Metal tube with tapered measuring section
Overall Height
Standard for Flange & Sanitary Connection 250 mm
Standard for Thread 300 mm
Non-standard lengths can be customized to suit existing piping dimensions
Protection Category IP65, NEMA 12 & 13
Note: Specifications are subject to change without notice

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