Variable Area Flowmeter | 335

Variable Area Flowmeter | 335

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Variable Area Flowmeter 335 Overview

The Variable Area Flowmeter 335 from GF Piping Systems are radially installed, dismountable meters for measuring the flow rate in industrial piping system constructions. The measuring principle is advanced and efficient. The measurement ranges, which are tailored to our customers‘ needs, and the range of materials available for the tubes and screwed fittings, allow the flow meters to be used for a wide range of applications and a great variety of media.

Function
If a medium flows upwards through the vertically mounted measuring tube at a sufficient flow velocity, 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. As the mean flow velocity is proportional to the quantity flowing through per unit of time, this state of equilibrium corresponds to the measurement of the current flow volume.

Variable Area Flowmeter 335 Features

  • Easy and cost-effective measurement principle.
  • No additional energy required for the operation.
  • Easy reading of the measured value.
  • Available scale range from 50 l/h up to 60 000 l/h.
  • Printed double scale for water in percent and l/h.
  • Special scales for liquid and gaseous media can be attached.
  • Wide range of materials.
  • Break-proof and corrosion-resistant.
  • Large dimensions with guiding rod (PVDF-coated).

Datasheet

Description

Variable Area Flowmeter | 335 Technical Specifications

Dimensions Type 335 d32/DN25 – d75/DN65, 1″ – 2 ½”
Measuring tube materials Type 335 PA | PSU | PVC-U transparent
Special version PSU-HP
Float materials PVDF | PTFE*
Gasket material O-rings EPDM | FKM
Pressure rating PN10
Scale ranges Type 335 50 – 60’000 l/h
Connections Type 335 PVC-U solvent cement sockets

Pressure Losses

Pressure loss of type 335/350
Scale range (l/h) Type Pressure loss (mbar)
50 – 500 335 22.84
100 – 1000 335 22.84
150 – 1500 335 22.84
250 – 2500 335 22.84
200 – 2000 335 24.99
300 – 3000 335 24.99
600 – 6000 335 24.99
1000 – 10000 335 24.99
1500 – 15000 335 28.23
2000 – 20000 335 45.67
3000 – 30000 335 45.67
8000 – 60000 335 47.24

Measuring Accuracy

Measuring accuracy according to VDI/VDE 3513, Error limit value G = 5%, Range of Linearity qG= 50%, this means up to max. +/- 5% of the final value.

Flowrate in % 10 20 30 40 50 60 70 80 90 100
Total measurement error % of the measured value 13.0 8.0 6.3 5.5 5.0 5.0 5.0 5.0 5.0 5.0
Total measurement error % of full-scale value 1.3 1.6 1.9 2.2 2.5 3.0 3.5 4.0 4.5 5.0

Dimensions

Scale range (l/h) Type D (mm) DN (mm) L (mm) L1 (mm) L2 (mm) G (inch)
50 – 500 335 58 25 385 341 335 1 ½
100 – 1000 335 58 25 385 341 335 1 ½
150 – 1500 335 72 32 393 341 335 2
250 – 2500 335 72 32 393 341 335 2
200 – 2000 335 83 40 403 341 335 2 ¼
300 – 3000 335 83 40 403 341 335 2 ¼
600 – 6000 335 83 40 403 341 335 2 ¼
600 – 6000 335 101 50 417 341 335 2 ¾
1000 – 10000 335 101 50 417 341 335 2 ¾
1500 – 15000 335 101 50 417 341 335 2 ¾
2000 – 20000 335 135 65 429 341 335 3 ½
3000 – 30000 335 135 65 429 341 335 3 ½
8000 – 60000 335 135 65 429 341 335 3 ½

Brand

Georg Fischer

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Additional information

Options

PVC-U Socket range 50 – 500 (l/h), PVC-U Socket range 100 – 1000 (l/h), PVC-U Socket range 150 – 1500 (l/h), PVC-U Socket range 250 – 2500 (l/h), PVC-U Socket range 200 – 2000 (l/h), PVC-U Socket range 300 – 3000 (l/h), PVC-U Socket range 600 – 6000 (l/h) (1), PVC-U Socket range 600 – 6000 (l/h) (2), PVC-U Socket range 1000 – 10000 (l/h), PVC-U Socket range 1500 – 15000 (l/h), PVC-U Socket range 2000 – 20000 (l/h), PVC-U Socket range 3000 – 30000 (l/h), PVC-U Socket range 8000 – 60000 (l/h)

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