Yep, I was referring to the guy on WizD forums' project - basically a waste of time when it's already been done, however the Innovatek ones are 1/4" BSP for 8mm OD Tubing, so imagine the ID if you will
A cheap 1/2" ID suitable alternative is certainly required... and I'd definitely have a load off you Dave...
However, rest of those in the uk, if desparate, head to rswww.com and type "compact flow sensor" into the search box.
Quote:
This lightweight, compact flow sensor is manufactured from Grilamid TR55 and has a PTFE filled nylon rotor on a stainless steel shaft. Although intended as a low cost option for flow rates of 1 to 20l/min. the unit is well specified with a working temperature range of 5 to 50°C and a low pressure drop. Basic construction consists of a one piece sensor body housing a turbine rotor. Flow through the unit causes rotation of the turbine which interupts a photelectric beam within the unit. This signal is then processed and the resultant pulse output, being proportional to flow rate, can be used in batch control or totalising etc.
Body - Grilamid TR55
Rotor - 18% PTFE filled nylon
Shaft - Stainless steel
Shaft retainers - Grilamid TR55
Working pressure (max.) - 10 bar
Pressure drop - Max. 0·1 bar at 15l/min.
Flow range (max.) - 1 to 20l/min.
‘K’ factor - 752 pulses per litre
Accuracy - ±5% << ick
Repeatability - ±1%
Temperature range - 5 to 50°C <<ick possibly depending on application
Weight - 16 grams
Connections - 3/8 BSP
Power supply - 5V d.c.
Photoelectric type - Infra-red
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Retails at £41 for one off, £39 for 6 off. Certainly an alternative for those in the UK...
They also do one suitable for -25 deg C thru 125 deg C, pressure drop of 1bar at 1cSt - £78 a piece.
They do a dirt cheap one for 15mm diam tubing, if you can adapt it down it may be suitable... only £20.37. Type "Liquid Flow Sensors -15mm dia Pipe" into their search box.
Basically, rswww.com > Automation > Fluid Management & Control > Flow Transducers (if you want to walk yer way thru the catalog and see all the options)