Liquid roots flow meter

Name: Liquid roots flow meter
Brand: SILVER AUTOMATION INSTRUMENTS LTD.
Availability: InStock

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1. PRODUCT INTRODUCTION

The LL series liquid roots flowmeter is a type of positive displacement flowmeter. Featuring innovative product design, attractive appearance, and rational structure, the LL series liquid roots flowmeter offers high accuracy, high precision, and easy installation and use. It is widely applied in petroleum, electric power, metallurgy, transportation, national defense, and other sectors for oil measurement and commercial trade settlement.

1.1 Working Principle

working principle of roots flow meter

When the measured liquid flows through the measuring chamber, a pressure difference is formed at the inlet and outlet of the flowmeter, and the Liquid Rootss rotate under the push of this pressure difference. At the same time, through a pair of driving gears fixed on the lobe shaft, the two Liquid Rootss maintain continuous rotation. As the Liquid Rootss rotate, the liquid is continuously discharged from the flowmeter through the measuring chamber. The volume of liquid passing through each pair is four times the volume of the measuring chamber. Through the sealed coupling and reduction mechanism, the number of rotations is reduced and transmitted to the counter, which indicates the instantaneous flow and cumulative flow of the liquid.

Installing a transmitter in the counting mechanism creates flowmeter with transmitter. When matched with display instruments or microcomputer systems, it can realize remote transmission (quantitative, cumulative, instantaneous and other functions) automated measurement and control. For usage instructions, please refer to the display instrument classification manual.

1.2. STANDARDS AND CERTIFICATIONS

Product Standard	JB/T9242-2015 (General Technical Specifications for Positive Displacement Flowmeters)
Explosion-proof Mark	Exd II CT6
Flange Standard	DN, ANSI, JIS
Protection Class	IP66

1.3. TECHNICAL PARAMETERS

Accuracy Grades

0.5%, 0.3%, 0.2%

Ambient Temperature

-25°C to +60°C

Environmental Temperature

Electronic Counter (Standard): -25°C to +60°C

Mechanical Counter (Optional): -43°C to +60°C

Main Component Materials and Nominal Pressure

Model	Shell, Front & Rear Cover	Cover Plate	Liquid Roots	Shaft	Bearing	Nominal Pressure (MPa)
LL-AL	Cast Iron	Cast Iron	Aluminum Alloy	Stainless Steel	Rolling Bearing	0.6, 1.0, 1.6
LL-EL	Cast Steel	Cast Iron	Aluminum Alloy	Stainless Steel	Rolling Bearing	DN80↓ 4.0 DN100↑ 2.5
LL-LL	Aluminum Alloy	Cast Iron	Aluminum Alloy	Stainless Steel	Rolling Bearing	0.6, 1.0, 1.6
*Note*	Special materials available upon request and can be customized for specific applications

Application Notes:

• LL-AL Series: Cast iron flowmeters are widely used for various oils and non-corrosive fluids.

• LL-EL Series: Cast steel flowmeters are suitable for high-pressure and low-viscosity fluids.

• LL-LL Series: Aluminum alloy ultra-light for low-pressure, low-viscosity fluids.

1.4. FLOW RANGE

Flow ranges vary depending on fluid viscosity and required accuracy grade.

Flow Range Unit: m³/h

Nominal Diameter (mm)	Fluid Viscosity (mPa·s)
Nominal Diameter (mm)	2.0~150	0.6~2.0	2.0~150	0.6~2.0	2.0~150	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 Grade	0.5		0.3		0.2

Note: For applications requiring 0.2% accuracy grade with specific flow requirements, mechanical sealed structure may be used with adjusted maximum flow rates. Please consult factory for specific configurations.

1.5. DIMENSIONS AND INSTALLATION

dimensions of roots flow meter

Refer to separate dimension tables document for complete specifications of:

• Cast Iron Type Flowmeter (LL-AL Series) - Magnetic Sealed Structure

Model	L	H	I	B	C	D	D1	N-Φ	Weight (kg/unit)
LL-AL25.06 Thread	180	297	75	110×110	148	G1¼″ (Pipe thread)			8
LL-AL25.06 Flange	180	297	75	110×110	148	φ115	φ85	4-φ14	10
LL-AL40.1	240	320	88	φ170	170	φ150	φ110	4-φ18	21
LL-AL50.1	265	335	97	φ190	185	φ165	φ125	4-φ18	26
LL-AL80.1	265	394	122	φ246	248	φ200	φ160	8-φ18	40
LL-AL100.1	350	484	164	φ305	335	φ220	φ180	8-φ18	88
LL-AL150.1	560	602	232	φ440	455	φ285	φ240	8-φ22	202

Model Explanation Sample: LL-AL25.06

LL-Liquid Roots flow meter

AL-Cast iron shell + aluminum alloy rotor

25-DN25

.06-Pressure 0.6 Mpa

• Cast Steel Type Flowmeter (LL-EL Series) - Magnetic Sealed Structure

Model	L	H	I	B	C	D	D1	N×Φ	Weight (kg/unit)
LL-EL25.3 Thread	180	297	75	120×120	148	G1¼″ (Pipe thread)			10
LL-EL25.3 Flange	180	297	75	120×120	148	φ115	φ85	4-φ14	10
LL-EL40.4	240	320	88	φ170	170	φ150	φ110	4-φ18	30
LL-EL50.4	360	370	105	φ226	222	φ165	φ125	4-φ18	41
LL-EL80.4	360	405	128	φ256	258	φ200	φ160	8-φ18	52
LL-EL100.3	450	482	167	φ334	338	φ235	φ190	8-φ22	110
LL-EL150.3	560	602	232	φ455	458	φ300	φ250	8-φ26	215

Model Explanation Sample: LL-EL40.4

LL-Liquid Roots flow meter

EL-Cast steel shell + aluminum alloy rotor

40-DN40

.4-Pressure 4Mpa

2. FLOW METER CONFIGURATION

The flow meters are generally supplied from the factory according to the following configurations. See the table below for matching counter models and performance parameters:

Type	Parameters	Pictures
A	Pointer indication, 6-digit totalizer, no reset. Pointer indication: DN25 and below: 10L/rev DN80 and below: 100L/rev DN100 and above: 1000L/rev
A6	Pointer indication, 6-digit totalizer with 4-digit batch totalizer, resettable. Pointer indication: DN25 and below: 10L/rev DN80 and below: 100L/rev DN100 and above: 1000L/rev
BELZ	Digital display. Displays total flow, instantaneous flow, batch reset, explosion-proof available

3.MODEL SELECTION

The following coding system is used for Liquid Roots flowmeter model selection:

Item	Code	Description
Series Type	LL	Liquid Roots Flowmeter
Shell Material	A	Cast iron
	E	Cast steel
	L	Aluminum alloy
Rotor Material	L	Aluminum alloy
Nominal Diameter	25~150	Flow meter sizes from DN 25mm to DN150mm
Pressure Rating	.06	0.6 MPa
	.1	1.0 MPa
	.2	1.6 MPa
	.3	2.5 MPa
	.4	4.0 MPa
Register	A	Mechanical pointer, 6 digits totalizer, no return to zero
	A6	Mechanical pointer, 6 digits totalizer, return to zero
	BELZ-0	Digital indicator, instant and totalized flow, battery power, no output, Explosion proof
	BELZ-1	Digital indicator, instant and totalized flow, 24V DC, Pulse output, 3-wire, Explosion proof
	BELZ-2	Digital indicator, instant and totalized flow, 24V DC, 4-20mA output, 2-wire, Explosion proof
	BELZ-3	Digital indicator, instant and totali

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