Tecfluid PT/PS Series


PT/PS Series

Variable area plastic tube flow meter

PT/PS Series


  • Low cost, excellent readability and light weight
  • Simple installation (flanged, threaded or socket ends forsolvent or fusion welding connections)
  • Wide range of operating temperatures with severalcombinations of tube and fittings materials
  • Scaled directly in l/h, m3/h, %,… Special scales for liquidsand gases on request
  • Flow rate:- Water: 4 l/h … 50 m3/h – Air: 200 Nl/h … 1500 Nm3/h
  • Accuracy:- Models PS: 4% (qG=50%) – Models PSM / PTM03: 6% (qG=50%)
  • Connections:- ISO 1452-3 or ASME B16.5 flanges: DN15 … DN80 / ½” … 3” – BSP or NPT threaded connections ½” … 3” – Solvent weld socket PVC connections – Stainless steel & PP connections for welding
  • Materials:- Measuring tube: Polysulfone and NAS® – Fittings: PVC, EN 1.4404 (AISI 316L), PP, steel – Float: EN 1.4404 (AISI 316L), aluminium, PVC, PVDF, PTFE,… – Gaskets: NBR, VITON®, EPDM
  • Local indication
  • Options:- 1 or 2 limit switches – Electronic transmitter with 4-20 mA analog output (18 points max.). Ex version and HART, PROFIBUS, FIELDBUS, MODBUS RTU protocols available on request

Working principle

The series PS flowmeters work according to the variable area principle, obtained by a float that moves along a tapered tube made of technical plastic materials.The force of the flow pushes the float to a certain height inside the tapered tube, to an equilibrium point: – E = force of the fluid flow – Pf = weight of the float – Al = free area of flow (Al = Ac, tube area – Af, float area) Each height or position of the float corresponds to a value of flow rate.


  • Water & waste water treatment
  • Chemical & petrochemical industry
  • Paper industry
  • Pharmaceutical, cosmetics & synthesis
  • Refrigeration & air conditioning
  • Refining
  • Osmosis
  • Gas processes


  • PS/PSMPolysulfone tube (PSU)
  • PTM03 NAS® tube (styrene methyl methacrylate copolymer) According to connections materials, see next page


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