iSOLV MMT28 / MMT19 - Miniature Metal Tube Variable Area Flowmeter

iSOLV MMT18 and MMT19 are known as Miniature Metal Tube Variable Area flowmeters. The flow meter operates is based on the variable area principle: fluid flow raises a float in a tapered tube, increasing the area for passage of the fluid. The greater the flow, the higher the float is raised. The height of the float is directly proportional to the flowrate.

The float reaches a stable position in the tube when the upward force exerted by the flowing fluid equals the downward gravitational force exerted by the weight of the float. The float then moves up or down, changing the annular area until it again reaches a position where the forces are in equilibrium.

A change in flowrate upsets this balance of forces. The float adjusts itself so that the buoyancy force B acting on it, wall tube resistance W and its downward gravitational force by weight of the float G are in equilibrium: G = B + W

It is important to note that because the float position is gravity dependent, flowmeter must be vertically oriented and mounted.

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• Stainless steel housing

• Different material available for process connection e.g Stainless steel, PVDF

• Thead, flange & hose connection

• Process Temperature: - 20°C to 100°C

• Operating pressure up to 10 bar (depending on meter size)

• Install up to 2 flow limit switches


Designed for flowrate measurements in many of industry including, food industry, water treatment plants and the chemical industry.


Technical Details
Turn-down Ratio:

10 : 1
Accuracy Class to VDI/VDE Code 3513, Sh.:
Measuring Cone:
Length in mm (inches): 100 (3.94”)
Scale graduation: Flow units

Operating Data
Max. allowable operating pressure at 20 °C (68 °F). Test pressure is 1.3 times the specified max. allowable operating pressure.*
6 bar
Max. Process Temperature:
120 °C (212 °F)[
b]With Limit Switches:[/b]
80 °C (176 °F)
* At temperatures > 20 °C (68 °F) pressure drops at the rate of 1% per degree C
** Flow > 2400 l/h, air: 4 bar
Overall Height and Connection Dimensions:
Refer to the catalogue
Standard 1/4”NPT, G1/4

Measuring Cone:

Borosilicate glass
Float Standard:
Stainless steel 1.4401 (316)
/PTFE (Option)
Float Stop:
Stainless steel 1.4571 (316 Ti)


Top/bottom connection block:
stainless steel 1.4581 (318 C17)
stainless steel 1.4571 (316 Ti)

Note: Specification are subject to change without notice.

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