Tecfluid VH Series

Description

Tecfluid VH Series

Flow switch and indicator for liquids and gases

Tecfluid VH Series

Features:

• Suitable for clear, opaque or turbid liquids (series AD & VH),and for gases (series AD)
• Flow switching by means of magnetic coupling, watertight,no contact between process fluid and switching, indicator or transmitter systems
• Suitable for installation in horizontal or vertical pipes
• Robust construction
• Scales available for H2O, air, oil, etc. (series AD)
• Flow rate (for liquids):
  • Series AD: 0.25 … 270 l/min
  • Series VH: 2 … 120 m3/h
• Accuracy for series AD: ±5% f.s.
• Connections:
  • Series AD: ¼” … 2 ½” BSP / NPT
  • Series VH: G1 / 1” NPT, to be inserted on a DN32 … DN500 pipe
• Materials:
  • Series AD: EN 1.4404 (AISI 316L), aluminium, brass
  • Series VH: EN 1.4404 (AISI 316L), PTFE
• Flow switching:
  • 1 reed switch (series AD & VH)
  • 2 reed switches (only series AD)
  • 1 or 2 inductive switches (only series AD) All switches for series AD are ATEX Ex ia IIC T4…T6 Ga / Ex ia IIIC T85ºC Da certified
• Options for model ADI15:
  • Local flow indication
  • Electronic transmitter with 4-20 mA output for safe or hazardous area (Ex ia IIC T4…T6 Ga / Ex ia IIIC T85ºC Da protection, ATEX certified). HART protocol available on request

Working principle

A spring M keeps a disk B in zero flow rate position. When the fluid flows through the disk at a specific speed, a force is made on the disk B, moving it to an equilibrium position. The distance covered by B depends on: – The force of the fluid flow F. – The relationship between areas A & B. – The force in opposition of the spring C. The equilibrium between forces F and the one generated by C defines the position of the disk B, equivalent to flow rate. The disk B, which contains a magnet M, acts over the switches and/or the local indicator.

Applications

• Machine or processes cooling
• Hydraulic and lubrication circuits
• Thermal oil circuits
• Gas flow control
• Mechanical fasteners cooling control

Models

• AD15 with one or two reed switches
• ADI15 local flow indication optionally with:one or two reed switches
  • one or two inductive switches
  • 4-20 mA transmitter