Liquid Roots Meter

Roots meter is also called Lumbar flow meter, which is a positive displacement flowmeter. Roots flowmeter for Liquid is called liquid Roots flowmeter. Gas Roots flowmeter is used for measuring gas.

Features of Liquid Roots Meter

• It has the characteristics of light weight, high precision up to 0.1-0.5 grade, and easy installation and use. It is one of the typical products of positive displacement flowmeter
• This Liquid Roots Meter is manufactured by introducing advanced technology from BOPP&ReuthER from Germany and Oval from Japan.
• Liquid Roots Meter can measure the flow of gasoline, kerosene, diesel and other oil products, and can transmit the flow to the secondary meter remotely through the transmitter.
• Liquid Roots Meter consists of two parts: a housing and a counter. Customers can choose their own waist wheel flowmeter products according to the specific measuring medium.
• Liquid Roots Meter can be equipped with pointer counter and electronic digital display counter, which can be displayed on site or remotely controlled.

Specifications of Liquid Roots Meter

The header shows:	Pointer accumulation, zero return, pulse output, 4-20mA output, LCD display, communication output
Instrument model:	LL-11 display, 12 display plus signal, 13 signal output, H zero return, T high temperature, Y liquid crystal display
Measuring medium:	Liquid, various oils
Caliber specifications:	15—150
Flow measurement range:	0.25—250m3/h
measurement accuracy:	0.5 level 0.2 level
Temperature of the measured medium:	-20℃-100℃, maximum +200℃
Work pressure:	1.6MPa 2.5MPa 6.4MPa
output signal:	Pulse, 4–20mA
Communication type:	RS485
power supply:	DC12V—DC24V
Installation method:	Flange connection
Explosion-proof grade:	ExiaIIBT4
Protection level:	IP65

Extended Reading: Liquid Turbine Flow Meter

Flow Range（m³/h）

Diameter(mm)	Liquid viscosity (mPa.s) 2.0~150	Liquid viscosity (mPa.s) 0.6~2.0	Liquid viscosity(mPa.s) 2.0~150	Liquid viscosity(mPa.s) 0.6~2.0	Liquid viscosity(mPa.s) 2.0~150	Liquid viscosity(mPa.s) 0.6~2.0
25	0.6~6	1.2~6	1.2~6	1.5~6	1.5~6	2~6
40	1.6~16	3.2~16	3.2~16	4~16	4~16	5~16
50	2.5~25	5~25	5~25	6~25	6~25	8~25
80	6~60	12~60	12~60	15~60	15~60	20~60
100	10~100	20~100	20~100	25~100	25~100	33~100
150	25~250	50~250	50~250	60~250	60~250	80~250
Accuracy class	0.5 level		0.3 level		0.2 level

The main materials and nominal pressure are as follows:

Model	Shell, front cover, back cover	Cover	Rotor	axis	Shaft sleeve	Nominal pressure(MPa)
LL-AL	cast iron	cast iron	Aluminum alloy	stainless steel	Ball bearing	0.6、1.0、1.6
LL-EL	Cast steel	cast iron	Aluminum alloy	stainless steel	Ball bearing	2.5、4.0
LL-LL	Aluminum alloy	Cast iron/stainless steel	Aluminum alloy	stainless steel	Ball bearing	0.6、1.0、1.6
Remarks	Special contract can be specially designed

Extended reading: Liquid mass flow controller

LL-AL cast iron waist wheel flowmeter is widely used in the measurement of various oil products and liquid media that does not corrode cast iron materials.

LL-EL cast steel waist wheel flowmeter is used for the measurement of high pressure and low corrosive media.

The LL-LL cast aluminum light waist wheel flowmeter is suitable for the measurement of low viscosity, low pressure, and low corrosion (such as water, etc.) media.

Read more about: Liquid Flow Meters Guide

How does a Roots meter work?

Roots meter is also called waist flow meter. The working principle is the same as that of the oval gear flowmeter, and the structure is also very similar, except that the shape of the rotor is slightly different.

The rotor of the Roots meter is a pair of waist-shaped wheels without teeth. During the rotation, the two waist wheels do not directly contact and maintain a small gap. The driving is completed by the meshing gear that is sleeved outside the shell and coaxial with the waist wheel. This has obvious advantages compared with oval gear flow meters.

Oval gears have large meshing contact wear and are greatly affected by the cleanliness of the measured fluid. Easy to damage and reduce accuracy.

The Roots meter is linked by an additional drive gear, so there is no contact between the measuring elements during operation. Therefore, the wear during operation is very small, and high measurement accuracy can be achieved. It can keep the long-term stable parts of the flowmeter.

The structure of the waist wheel flowmeter can be divided into vertical and horizontal according to the working state:

The structure of the waist wheel includes a pair of waist wheels and a combined waist wheel composed of two pairs of waist wheels at an angle of 450 to each other.

The combined waist wheel flowmeter runs smoothly, which can greatly reduce the pressure fluctuation in the pipeline.

Generally, large-diameter flowmeters use vertical or horizontal combined waist wheels to reduce or eliminate pipeline vibration caused during flow measurement.

The rotor line of the waist wheel flowmeter is more reasonable, allowing the measurement of fluids containing tiny particles. Can be used for gas and liquid measurement. It is a positive displacement flowmeter that has been rapidly developed and widely used in recent years.

In addition to being used for industrial measurement, Roots meter is also used as a standard flow meter to calibrate other types of flow meters. The accuracy can reach ±0.1%.

Read more about: Positive Displacement Flow meter Technology

Types of positive displacement flow meter

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Sino-Inst, Manufacuturer for Liquid Roots Meters. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.

Sino-Inst’s Liquid Roots Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.