Glass Tube Variable Area Flowmeter – GTG20

 

isolvGlass Tube Variable Area Flowmeter. 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.

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.

  • Large window allows visual control of the process fluid.
  • Millimetre scale on the glass cone. The scale is calculated to the calculation method in conformity with VDE / VDI 3513.

Measuring ranges (100 % values)
Water 20 °C (68 °F) 0.4 - 10,000 l/h
Air 1.013 bar abs., 20 °C (14.7 psia, 68 °F) 0.016 - 310 m3/h
Turn-down ratio 10 : 1
Accuracy class to VDI / VDE Code 3513, Sh. 2 1.0
Scale Millimetre scale division or flow units on cone
Float A III (A III guided on request)
Connection
GTG20 Screw connection G 1 /2” to G 2”
GTR20 Tubing nozzle dia. 15 mm to 52 mm ( 1 /2” to 2” )
GTF20
Flanges (metric) DN 15 to DN 50 with holes drilled to DIN 2501 / PN 40
Flanges (imperial) 1 /2” to 2” with holes drilled to ANSI B 16.5, Class 150 lbs
/ RF or 300 lbs / RF
other versions on request
GTS20 Sanitary connection DN15 to DN50
Max. allowable operating pressure at 20 °C (68 °F)DN 15, DN 25 / 10 bar ( 1 /2”, 1” / 145 psig)
(At temperatures > 20 °C pressure drops at the rate of 1% per degree C) DN 40 / 9 bar (1 1 /2” / 130 psig)
DN 50 / 7 bar (2” / 101 psig)
Max. process temperature – 20 to + 100 °C
Overall height
GTG20 See Dimensions
GTR20 DN 15:400 mm ( 1 /2”:15.75”), >DN 25:450 mm
( >1”:17:72”)
GTF20 425 mm (16.73”)
GTS20 375mm (14.76”)
Materials
Instrument connections
GTG/GTR/GTF20 / SS Standard: SS304; Optional: SS316
GTS20 PVDF
Housing Standard: SS304; Optional: SS316
Measuring Cone borosilicate glass
Float Standard: SS304; Optional: SS316
Float stop and insert Gaskets PVDF
~ Standard Standard: Viton; Optional: BunaN




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