Small Positive displacement flow meter

What is a small flow positive displacement flow meter used for?

Ultra low flow PD flowmeter is specifically designed to accurately measure very small liquid flow rates, with the smallest being able to measure half a milliliter per minute (approximately only a dozen drops of diesel),but still can keep 0.5% high accuracy. It is particularly useful in places where precise control of liquid usage is required, such as low flow water measurement, ml/min fuel detection, and very low flow grease measurement.

How does ultra low flow rate positive displacement flow meter work?

The principle is simple as normal size oval gear flow meters: miniature PD flow meter divides the low flow rate liquid into fixed small portions, and then counts how many portions have passed  the micro flow sensor to get to know how much liquid has flowed in total.

There are small and precision-machined oval gears inside the robust flow sensor chamber, which will be pushed to rotate when liquid flows through. Every revolution represents sending away a fixed volume of liquid. By calculating how many revolutions were made, the total flow rate can be determined. This method is very direct, and the measurement results are basically not affected by liquid temperature and viscosity, so it is very accurate.

Features of Low flow rate positive displacement flow meter

High accuracy: The measurement accuracy can be as low as ± 0.5%, which is very reliable.

Wide range: It can measure very small flow rates and also cope with larger flow rate changes.

Digital micro flow meter : 24V DC power supply, PNP or NPN pulse output, option with digital display, 4-20mA analog outputs and RS485.

Good repeatability: Under the same conditions, the measurement results are consistent every time.

Small size, high pressure resistance: easy to install, some models can be used on pipelines with high pressure to 1,000 bar.

No liquid selection: Whether it is a thin liquid like water or a thick liquid like lubricating oil, it can be measured. And the higher the viscosity, the more accurate the measurement, because there is less leakage between elliptical gears.

Where is the small positive displacement flow meters used?

It has applications around us and in many industries:

Engine and fuel system: Accurately measuring tiny fuel consumption to help develop more fuel-efficient engines.

High viscosity and low flow Lubrication oil measurement

Machine lubrication system: Monitor the supply of lubricating oil to ensure that the machine does not wear out due to hunger or waste oil.

Low flow chemical dosing flow meter

Chemicals and ingredients: Accurately control the amount of various chemicals (even corrosive) added to ensure product quality and safety.

Mold and cooling: In plastic injection molding and other processes, precise control of the flow rate of cooling oil ensures better product molding.

Laboratory and Water Treatment: Accurately adding trace amounts of liquids in scientific research, or accurately dispensing disinfectant solutions during water purification.

What should be paid attention to in selection and maintenance of small PD flow meter?

How to choose: It mainly depends on the flow range you want to measure, the properties of the liquid (whether it is corrosive or sticky), the working pressure, and the required accuracy.

How to maintain: The liquid should be clean, and it is best to install a filter in front to prevent impurities from getting stuck in the precision components inside. During installation, ensure that the flow meter is always filled with liquid and free of air.

Micro positive displacement flow meter under $1,000

The price of small PD flow meters is related to many factors, such as aluminum flow sensor being generally more expensive than stainless steel flow sensor, high-pressure volumetric flow meters at 400 bar being more expensive than those at 100 psi, high-temperature volumetric flow meters at 300 degrees Celsius being more expensive than those used at room temperature, and the size of the sensor size also affecting the price. But silverinstruments.com can always help you choose a positive displacement flow meter that costs less than $1000, so you don't have to worry about the price.

A small flow volumetric flowmeter is like a high-precision liquid "micro meter". It works in a direct "copy by copy" manner, with precise and reliable results, playing a key role in many fine processes from laboratory to factory production, and is an important tool for modern industry to achieve fine control.