Product Range
Variable Area Flow Meters Type 335, Type 350 Short Version Product Range Special Version
Benefits Variable area flow meters �?a reliable, accurate and economical measuring principle. Variable area flow meters from GF Piping Systems are radially installed dismountable meters for flow measuring in industrial piping applications. The measurement ranges, which are attuned to our customers�?needs, and the range of materials available for the tubes and connection ends, mean that the flow meters can be used for a wide range of applications and a great variety of media.
Measuring principle - Three main forces act on the float • The weight G • The buoyancy A • The flow force K Main advantages • The flowmeters require no auxiliary power • Cost effective to measure the flow rate • Break-proof and corrosion-resistant • Accessories like sensor 4-20 mA and limit contacts • Guiding rod from DN50 for stabilisation of float within v • Low pressure loss • Can be used for liquids and gases • Volume- and % scale as standard Segments • Water Treatment • Chemical Process Industry • Microelectronics • Food & Beverage • Ship Building • Building technology • And many more
Features Know your flow All the flow meters are equipped with a double scale: a percentage scale as well as a scale for the flow volume in l/h for water (H2O). Special scales are on offer for m³/h, GPM, in addition to special graduations for HCL, NaOH, air and can be affixed on taper tubes without scales subsequently. Measuring accuracy falls in the accuracy class 4 according to VDE/VDI 3513 Part 2.
Install and remove radially with threaded joint Wide dovetail guide for easy fastening of limit switches One limit switch each for min. / max. flow (optional) Transparent taper tube in a variety of materials Insert with damping feature for float in case of water hammer Flow immediately visible with setpoint indicators Imprinted double scale for water in percent (%) and flow volume (l/h) Orange-colored PVDF float makes it easy to read the flow Fast connection with standardized cement socket
System details The float measuring principle �?accurate flow measurement of liquids and gases. Before installing 1. The pincer-like transport lock must be removed. To do this, the upper union nut is unscrewed and the upper insert including seals is removed. Double-check the taper tube and if available the guiding rod on damages caused due to shipping. 2. Then the VAFM must be reassem bled. 3. The piping system into which the VAFM is installed must be in a vertical position to ensure its functionality. 4. An inlet and outlet section must be provided for (inlet ca. 10 x DN, outlet ca. 5 x DN). Accessories Due to the integrated dovetail shaft it is possible to mount further accesso ries like 4-20 mA flow sensor GK15 or limit contacts GK10/11. Accurate reading The top edge of the float indicates the flow volume. If special scales are applied subsequently, it must be ascertained that the scale marking EF is affixed congruently with the one on the taper tube. Installation lenghts and materials The variable area flow meters are now available in the installation lengths 335 mm, 350 mm, 200 mm, 185 mm and 165 mm. The taper tubes are available in Polyamid, Polysulfon and transparent PVC-U. The standard floats are in PVDF with or without magnet. The end stops are in PVDF. The threaded joint including insert is available in PVC-U, as well as in PP, PE or ABS on request. The O-rings are made of EPDM or FPM. The nominal pressure is 10 bar at 20°C. If a medium flows upwards at a sufficient rate of flow through the vertically mounted taper tube, the float is raised to the point at which a state of equilibrium sets in between the lifting force of the medium and the weight of the float. Since the mean rate of flow is proportional to the quantity flowing through per unit of time, this state of equilibrium corresponds to the measurement of the instantaneous flow rate.
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