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Rotary wheel type double window sight flow indicator with stainless rotor visible through the glass
Double Window Sight Flow Indicators

Rotary Wheel Type Double Window Sight Flow Indicator

Rotating wheel flow indicator, 25NB to 400NB

Double window sight flow indicator with a rotating wheel whose speed indicates flow velocity — readable from a distance and ideal for opaque liquids and heavy gases.

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At a glance
Product typeRotary wheel type double window sight flow indicator
Body materialWCB / MS / CF8 / CF8M / CF3M
Rotary wheelCF8 / CF8M / CF3M, 1 off
GlassToughened borosilicate 3.3 or soda lime, 2 off
GasketPTFE, 4 off
FastenersG.I. / A2 / CF8
Size range25NB to 400NB
Face to face127 mm to 850 mm, tolerance ±3 mm

Product overview

What it does, and where it fits.

A plain sight glass shows you a fluid. It does not tell you whether that fluid is moving, and with an opaque liquid or a gas it may not tell you anything at all. A rotary wheel indicator puts a stainless rotor in the flow path: the wheel turns when there is flow, and the speed of rotation indicates the velocity.

That makes it readable at a glance from across a plant, without an operator having to stand at the glass and stare into it. It is the standard choice for opaque liquids, slurries and heavy gases where a clear window tells you nothing.

The rotor is CF8, CF8M or CF3M. Body options cover WCB, MS, CF8, CF8M and CF3M, with the same dimensions as the standard double window model.

Features

Built into every unit.

  • Rotating stainless wheel — speed of rotation indicates flow velocity
  • Flow can be detected from a distance
  • Ideal for opaque liquids and heavy gases where a clear window shows nothing
  • Rotor in CF8 / CF8M / CF3M
  • 25NB to 400NB, dimensions matching the standard double window model

Benefits

Why it earns its place in the line.

  • Shows flow rate, not just flow presence
  • Readable from a distance without an operator at the glass
  • Works on opaque and dark fluids that defeat a plain window
  • Robust flanged body drops straight into an existing line
  • Glass and gaskets replaceable in situ without cutting the pipework

Applications & industries

Where it is specified.

Typical applications

  • Opaque, dark or coloured liquids
  • Slurries and suspensions
  • Heavy gas flow confirmation
  • Remote visual confirmation of pump running

Industries served

  • Chemical processing
  • Pharmaceutical
  • Dairy & food
  • Water & effluent treatment
  • Agrochemicals
  • Paper & bleaching
  • Petrochemical
  • Distillation & solvent recovery

Technical data

Specification for Rotary Wheel Type Double Window Sight Flow Indicator.

Figures below are for this product only — every item in the range carries its own dimension table.

Rotary Wheel Type Double Window Sight Flow Indicator — technical specification
Product typeRotary wheel type double window sight flow indicator
Body materialWCB / MS / CF8 / CF8M / CF3M
Rotary wheelCF8 / CF8M / CF3M, 1 off
GlassToughened borosilicate 3.3 or soda lime, 2 off
GasketPTFE, 4 off
FastenersG.I. / A2 / CF8
Size range25NB to 400NB
Face to face127 mm to 850 mm, tolerance ±3 mm
IndicationSpeed of rotation indicates flow velocity
Flange standardANSI B-16.5; BS-10 Table E, BS-10 Table F and PN 10 also available
Rotary Wheel Type Double Window Sight Flow Indicator — dimensional table
SizeOD (±3)PCDH (No.)H dia.L (±3)
25NB10879416127
40NB12798416165
50NB152121419178
80NB191152419203
100NB229191819229
150NB279241822267
200NB343298822520
250NB4063621225600
300NB4834321225650
350NB5334761229760
400NB5975401629850

All dimensions in mm. Flange drilling to ANSI B-16.5; BS-10 Table E, BS-10 Table F and PN 10 drilling are also available — see the flange standards table.

Material specification
No.DescriptionQty.Material
1Body1WCB/MS/CF8/CF8M/CF3M
2Toughened glass2Borosilicate 3.3 / soda lime
3Gasket4PTFE
4Connectors2WCB/MS/CF8/CF8M/CF3M
5Fasteners—G.I./A2/CF8
6Rotary wheel1CF8/CF8M/CF3M

Available on request

  • Choice of body MOC
  • Different flange standards

Exploded view

Every part, in assembly order.

Item numbers match the material specification table above.

Exploded assembly view of the Rotary Wheel Type Double Window Sight Flow Indicator showing numbered components

FAQ

Questions we are asked about this item.

No. The speed of rotation indicates flow velocity qualitatively — it tells an operator that flow is present and roughly how fast. For a measured rate you need a flow meter.

A rotary wheel works in either flow direction and reads well from a distance. A flapper suits uni-directional flow and shows velocity by the angle it takes up.

Enquiry

Tell us your line size — we'll confirm the spec.

Send the bore, the media, the temperature and pressure, and the flange standard you work to. Drawings and custom sizes welcome.

Enquire on WhatsAppChat to us on +91 90336 30547 Request the datasheetWe will email the drawing for this item Talk to a technical expertMaterial selection and duty review Send a drawingWe fabricate to your isometric or sketch Request a custom sizeNon-standard bores, lengths and drilling

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