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Blue White Flow Meter Catalogue: Sourcing Pitot Tube and Rotameter Portfolios
Quick Answer: If you source pitot tube or rotameter flow meters from the Blue White catalogue, confirm pipe size, flow range, pressure, temperature, and chemical compatibility before you compare models. This guide covers selection factors, common mistakes, and a request for quote format. Silver Instruments offers alternative technologies for water, chemical, and process plants where a standard catalogue meter does not fit.
This article is for engineers, maintenance leads, and procurement staff in water treatment, chemical dosing, food and beverage, and general process plants. The focus is practical. You need a flow meter that fits a specific line and you need price and lead time quickly.
What the Blue White Catalogue Covers
The Blue White flow meter catalogue spans variable area rotameters, pitot tube flow sensors, and some digital paddlewheel lines. Most buyers in Southeast Asia search this catalogue for two reasons. They need a mechanical flow indicator with a local display and no power supply. Or they need a low cost insertion style meter for larger pipes where an inline spool piece costs too much.
Rotameters in the Blue White line appear in sizes from about DN15 to DN100. Flow ranges depend on tube material and float material. Common process connections include NPT, BSP, and union fittings. A water treatment plant in Malaysia needed a local visual indicator for sodium hypochlorite dosing at 2 to 20 litres per hour. The selection came down to body material, O-ring material, and float size.
Pitot Tube Flow Meter Selection Factors
A pitot tube flow meter measures differential pressure and converts that signal into flow rate. The Blue White catalogue includes insertion pitot tube sensors for water and clean liquids in pipe sizes from DN50 to DN400. We have seen this on customer sites many times. The buyer already has a pressure gauge or wants a simple mechanical readout. The pitot tube fits into a saddle or threaded tap and avoids cutting the pipe.
Key parameters include pipe ID, insertion depth, maximum pressure, sediment load, and straight run. Most engineers skip this part and later find the reading drifts because the tap point sits too close to an elbow or pump. Allow 10 to 20 pipe diameters of straight run upstream and 5 diameters downstream.
A customer in Vietnam asked us last year about a pitot tube for river water intake at a cooling tower. The pipe was DN300, pressure was 4 bar, and temperature was around 30 °C. They wanted a local display and a 4-20 mA output. Silver Instruments supplied an electromagnetic flow meter instead because the water contained silt and the pitot tube ports would clog within weeks. That detail changed the total cost of ownership.
Rotameter Portfolio Sourcing Notes
Rotameters, also called variable area flow meters, are simple. A float moves inside a tapered tube. Flow rate is read from the float position. No power supply is needed. This design is popular for purge flow, seal water, sampling systems, and small chemical dosing lines.
Before you ask for a rotameter price, state the fluid name and concentration, minimum and maximum flow rate in litres per hour or litres per minute, pressure in bar, temperature in °C, pipe size in DN, connection type, and whether you need a valve or limit switch. A clear request reduces quote turnaround time.
For aggressive chemicals, do not assume the standard plastic body works. Check PVC, PTFE, PVDF, or metal tube options against a chemical compatibility table. Silver Instruments can help with industrial flow meters for harsher fluids where a standard catalogue rotameter is not enough. A seawater flow meter for desalination plant often moves to an elec
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Where Silver Instruments Fits
Silver Automation Instruments is not the Blue White factory. We are an industrial flow meter manufacturer and supplier based in Nanjing, China. We support customers in Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Our range includes electromagnetic flow meters, Coriolis mass flow meters, ultrasonic flow meters, vortex flow meters, oval gear flow meters, thermal mass flow meters, pressure transmitters, and paperless recorders.
For clean water and chemical dosing, a rotameter can be the right low cost choice. For wastewater, slurries, high pressure gas, steam, liquid with solids, or remote monitoring, a different flow meter often works better. Here is the thing. A rotameter cannot handle solids, high viscosity, or rapid temperature swings. A pitot tube cannot handle dirty liquids. In those cases, an electromagnetic or ultrasonic meter from Silver Instruments has a stronger long term reliability profile.
We have supplied flow meters to a paint manufacturer in Southeast Asia for solvent and resin batching. They started with variable area meters on some small lines. After a year they replaced three of those lines with Coriolis mass flow meters because the recipe accuracy needed mass flow in kg/h, not volume flow. That is a common upgrade path.
Request for Quote Details
When you send a quotation request to Silver Instruments, include fluid name, concentration, viscosity in cP if above 5 cP, flow range, pipe size in DN, pressure in bar, temperature in °C, conductivity in µS/cm for water or wastewater, output signal such as 4-20 mA HART or pulse, and optional PT100 if temperature compensation is required. Add hazardous area classification if needed, such as ATEX Zone 1. This lets us recommend the right model and avoid a wrong specification.
For example, write this in your email. We need a flow meter for seawater at 25 °C, pressure 6 bar, pipe DN80, flow range 5 to 50 cubic metres per hour, output 4-20 mA HART, no hazardous area. That single line is enough for us to start.
Contact Silver Instruments today. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Website: flow-meter.com.au. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. We will reply with a model, price idea, and lead time.
FAQ
Does Silver Instruments sell Blue White flow meters?
No. We are a separate flow meter manufacturer and supplier. We can help you source equivalent rotameter or pitot tube style solutions or supply alternative technologies when the application demands more performance.
What is the difference between a pitot tube flow meter and a rotameter?
A pitot tube meter is an insertion differential pressure device for larger pipes. A rotameter is an inline variable area meter for small to medium flow lines. Pitot tube works with clean liquids. Rotameters can handle clean liquids and gases.
What parameters should I send for a rotameter quote?
Send fluid name, flow range, pressure, temperature, pipe size, connection type, and whether you need a valve or alarm switch.
Can I use a rotameter for seawater or wastewater?
Usually not for long term service. Seawater can corrode metal parts and wastewater solids can jam the float. An electromagnetic flow meter is often a better choice for these fluids.
Which flow meter is best for chemical dosing lines?
For visual indication and low cost, a polysulfone or PTFE body rotameter works well. For remote monitoring, batching, or high accuracy, choose an oval gear or Coriolis mass flow meter depending on viscosity and flow range.
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