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
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