Flow Measurement

Glass Tube Variable Area Flow Meter

GTG20

GTG20 glass tube variable area flow meter

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The Glass Tube Variable Area flow meter GTG20 for liquids and gases feature a tapered glass tube and operate on the float measuring principle. They have a common basic design and various standard connections. The flow-meters are installed in a vertical pipe run with flow from bottom to top.

Glass Measuring Cones
The measuring cones are made of  high temperature-resistant  stress-free borosilicate glass. Cones and floats are individually replaceable (accuracy class 1.6).

The measuring cones are operated with  A III floats. These floats feature three notches on the top guiding edge which cause the floats to rotate and maintain a stable position during flow. 

  • 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.

MGT30 Glass Tube Variable Area Flow Meter is designed for flow rate measurements in many of industry including, food industry, water treatment plants and the chemical industry.

Flow Meter


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 ratio10:01
Accuracy class1 (to VDI/VDE Code 3513, Sh. 2)
ScaleMillimetre scale division or flow units on cone
FloatA III (A III guided on request)

Connections


GTG20Screw connection G 1 /2” to G 2”
GTR20Tubing 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
GTF20 – 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)
GTS20Sanitary connection DN15 to DN50
Max. allowable operating pressure at 20 °C (68 °F)DN 15, DN 25 / 10 bar ( 1 /2”, 1” / 145 psig)
DN 40 / 9 bar (1 1 /2” / 130 psig)
DN 50 / 7 bar (2” / 101 psig)
(At temperatures > 20 °C pressure drops at the rate of 1% per degree C)
Max. process temperature– 20 to + 100 °C

Overall Height


GTG20375 mm (14.76’’)
GTR20DN 15:400 mm ( 1 /2”:15.75”)>
DN 25:450 mm ( >1”:17:72”)
GTF20425 mm (16.73”)
GTS20375mm (14.76”)

Materials


GTG/GTR/GTF20 / SSStandard: SS304; Optional: SS316
GTS20PVDF
HousingStandard: SS304; Optional: SS316
MeasuringCone borosilicate glass
FloatStandard: SS304; Optional: SS316
Float stop and insert GasketsPVDF
Standard GasketsViton; Optional: BunaN