PD Flow Meter is referred to as positive displacement flowmeter. Helical Gear-PD Flow Meter is also called, spiral double rotor flowmeter, LLT, LZ double rotor flowmeter or UF-Ⅱ spiral rotor flowmeter.
As a high-precision flow meter, PD Flow Meter has an accuracy of 0.2 level. It is especially suitable for the measurement of industrial liquids such as crude oil, refined oil and light hydrocarbons. It is a new generation volumetric flowmeter. Because it uses a pair of spiral rotors with special teeth, it is also called “Helical Gear Flowmeter”.
Sino-Inst offers a variety of Oval Gear Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Features of Helical Gear-PD Flow Meter
- Notable features such as no pulsation, extremely low noise, high precision, high reliability, large flow, and strong environmental adaptability.
- The spiral rotor flowmeter can indicate cumulative flow, instantaneous flow, single flow, etc. on site.
- It can output pulse signal, 4-20mA or 1-5V analog signal, 4-20mA+HART, MODBUS, support 232,485 communication, etc.
- Combined with mechanical batch controller or electronic batch controller, it can realize various functions such as different types of filling and batch control.
- The spiral rotor rotates at a constant speed in the metering cavity, and the flow is constant.
- The spiral rotor rotates at a constant speed and the fluid pulsation is small.
- The sending pulse is stable and accurate.
- Various counters, speed regulators and external fine regulators can be configured.
- Can be installed vertically (limited to DN200 or less, please specify when ordering)
- It is suitable for thin oil, light oil, heavy oil, crude oil with large sand content and large water content, and the measured liquid has a large viscosity range.
- The flow of liquid through the flowmeter is large, and the maximum flow is about twice that of an ordinary volume meter with the same diameter.
- Long service life, high accuracy and strong reliability.
- The internal pressure loss is extremely small.
- The longest distance of wired remote transmission is 1000 meters, pulse signal output N=0.1L (one pulse is 1N), and it can be directly connected to the computer.
- Intrinsically safe explosion-proof IaⅡCT6 (intrinsically safe type); explosion-proof dⅡBT6 (explosion-proof type); protection IP56.
Read more about Everything You Need To Know About Electronic Flow Meters
Specifications of Helical Gear-PD Flow Meter
Technical Parameters
Nominal diameter (mm) | 8-400 |
Accuracy | 0.2/0.5 level |
Pressure loss | 0-1000mPa.s‹80KPa; 1000-20000mPa.s‹150KPa |
Nominal pressure | 1.6, 2.5, 4.0, 6.4MPa |
temperature range | -20℃-+80℃, +80℃+150℃, +150℃-+250℃ |
Medium viscosity | 0-2000mPa.s |
Ambient temperature | -30℃-+70℃ |
Connecting flange | GB9115.0719-2000 JB/TB2-94; It can also be manufactured according to user-specified flange standards |
Photoelectric pulse (current) converter | Explosion-proof mark: ExdⅡBT4 ExdⅡBT4 (excluding acetylene) |
Electronic counter | Explosion-proof mark: ExdⅡBT4 (without acetylene) |
Protection level | IP65 |
Extended reading: Orifice Plate Flow Meter
Material selection
Model | Shell, front cover, back cover | Cover | Spiral rotor | Shaft | Shaft sleeve | Nominal pressure (MPa) |
LLT-E | Cast steel | cast iron | Cast iron, aluminum alloy, stainless steel | stainless steel | Graphite, rolling bearings |
Below DN100 -4.0 Above DN150-2.5 |
LLT-B、C | stainless steel | stainless steel | stainless steel | 1.6、2.0、2.5 | ||
LLT-S |
Double body type flowmeter; Specifications are DN80, DN100, DN150; Nominal pressure 6.3MPa, DN200 nominal pressure 4.0MPa |
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Note |
The material of LLT-C is OCr18Ni12Mo2Ti; The material of LLT-B is OCr18Ni9Ti; Special requirements can be specially designed. |
Flow range (m³/h)
Table 1, Accuracy 0.5
Model | Diameter | Viscosity mPa.s | ||||||
0.3~0.8 | 0.8~2 | 2~15 | 15~400 | 400~1000 | 1000~2000 | 2000~3500 | ||
Petrol | Kerosene | Diesel, engine oil | Heavy oil | High viscosity liquids | ||||
LLT-0252 | 25 | 3~9 | 1.5~10 | 1~10 | 1~10 | 1~8 | 1~8 | 1~6 |
LLT-0401 | 40 | 3~9 | 1.5~10 | 1~10 | 1~10 | 1~8 | 1~8 | 1~6 |
LLT-0402 | 7~20 | 3~22 | 2.5~25 | 2.5~25 | 2~18 | 2~18 | 3~12 | |
LLT-0501 | 50 | 7~20 | 3~22 | 2.5~25 | 2.5~25 | 2~18 | 2~18 | 3~12 |
LLT-0502 | 9~36 | 4.5~36 | 3.6~36 | 3.6~36 | 2.8~25 | 2.8~25 | 4.5~18 | |
LLT-0801 | 80 | 9~36 | 4.5~36 | 3.6~36 | 3.6~36 | 2.8~25 | 2.8~25 | 4.5~18 |
LLT-0802 | 20~80 | 10~80 | 10~100 | 10~100 | 6.5~56 | 6.5~56 | 5~40 | |
LLT-1001 | 100 | 20~80 | 10~80 | 10~100 | 10~100 | 6.5~56 | 6.5~56 | 5~40 |
LLT-1002 | 25~100 | 18~100 | 15~150 | 15~150 | 8.5~80 | 8.5~80 | 6.5~55 | |
LLT-1501 | 150 | 25~100 | 18~100 | 15~150 | 15~150 | 8.5~80 | 8.5~80 | 6.5~55 |
LLT-1502 | 55~225 | 30~250 | 25~250 | 25~250 | 18~150 | 18~150 | 10~100 | |
LLT-2001 | 200 | 55~225 | 30~250 | 25~250 | 25~250 | 18~150 | 18~150 | 10~100 |
LLT-2002 | 90~360 | 50~400 | 40~400 | 40~400 | 28~240 | 28~240 | 20~160 | |
LLT-2501 | 250 | 90~360 | 50~400 | 40~400 | 40~400 | 28~240 | 28~240 | 20~160 |
LLT-2502 | 130~540 | 65~540 | 60~600 | 60~600 | 42~360 | 42~360 | 30~240 | |
LLT-3001 | 300 | 130~540 | 65~540 | 60~600 | 60~600 | 42~360 | 42~360 | 30~240 |
LLT-3002 | 220~800 | 110~900 | 95~950 | 95~950 | 70~600 | 70~600 | 54~450 | |
LLT-3501 | 350 | 220~800 | 110~900 | 95~950 | 95~950 | 70~600 | 70~600 | 54~450 |
Table two, Accuracy level 0.2
Model | Diameter | Viscosity mPa.s | ||||||
0.3~0.8 | 0.8~2 | 2~15 | 15~400 | 400~1000 | 1000~2000 | 2000~3500 | ||
Petrol | Kerosene | Diesel, engine oil | Heavy oil | High viscosity liquids | ||||
LLT-0252 | 25 | 3.5~8 | 3~10 | 2~10 | 2~10 | 2~8 | 2~8 | 2~6 |
LLT-0401 | 40 | 3.5~8 | 3~10 | 2~10 | 2~10 | 2~8 | 2~8 | 2~6 |
LLT-0402 | 8~20 | 5.5~22 | 4.5~22 | 4.5~22 | 4~18 | 4~18 | 3~12 | |
LLT-0501 | 50 | 8~20 | 5.5~22 | 4.5~22 | 4.5~22 | 4~18 | 4~18 | 3~12 |
LLT-0502 | 15~36 | 9~36 | 7~36 | 7~36 | 6~25 | 6~25 | 4.5~18 | |
LLT-0801 | 80 | 15~36 | 9~36 | 7~36 | 7~36 | 6~25 | 6~25 | 4.5~18 |
LLT-0802 | 30~80 | 20~80 | 15~80 | 15~80 | 14~56 | 14~56 | 10~40 | |
LLT-1001 | 100 | 30~80 | 20~80 | 15~80 | 15~80 | 14~56 | 14~56 | 10~40 |
LLT-1002 | 40~100 | 25~100 | 20~120 | 20~120 | 18~72 | 18~72 | 14~55 | |
LLT-1501 | 150 | 40~100 | 25~100 | 20~120 | 20~120 | 18~72 | 18~72 | 14~55 |
LLT-1502 | 88~220 | 57~225 | 44~220 | 44~220 | 38~150 | 38~150 | 25~100 | |
LLT-2001 | 200 | 88~220 | 57~225 | 44~220 | 44~220 | 38~150 | 38~150 | 25~100 |
LLT-2002 | 150~360 | 90~360 | 72~360 | 72~360 | 50~210 | 50~210 | 40~160 | |
LLT-2501 | 250 | 150~360 | 90~360 | 72~360 | 72~360 | 50~210 | 50~210 | 40~160 |
LLT-2502 | 180~540 | 135~540 | 100~540 | 100~540 | 90~360 | 90~360 | 60~240 | |
LLT-3001 | 300 | 180~540 | 135~540 | 100~540 | 100~540 | 90~360 | 90~360 | 60~240 |
LLT-3002 | 250~800 | 220~900 | 180~900 | 180~900 | 150~600 | 150~600 | 110~450 | |
LLT-3501 | 350 | 250~800 | 220~900 | 180~900 | 180~900 | 150~600 | 150~600 | 110~450 |
Remarks: For special requirements, class 0.3 and class 0.1 flowmeters can be provided
Read more about: Industrial Oil Flow Meters
How does a PD meter work?
The flow meter is mainly composed of a body, a pair of spiral rotors, a magnetic coupling, a reduction mechanism, an adjusting gear, a counter and a signalling device.
The number of revolutions of the spiral rotor is transmitted to the meter head counter through a reduction mechanism composed of a magnetic coupling and a series of gears.
The magnetic coupling is mainly composed of active magnetic steel and driven magnetic steel. The use of magnetic coupling can increase the working pressure and working temperature of the flowmeter, ensure safe operation, and reduce maintenance work.
Extended reading: Positive Displacement Flow meter Technology
The measurement chamber mainly has a sealed cavity formed by a pair of special rotors and cover plates as the flow measurement unit.
The rotor is driven by the pressure difference between the inlet and outlet of the flowmeter to rotate, so as to continuously measure the liquid at the inlet to the outlet after being measured in the sealed cavity.
The amount of liquid flowing through each revolution is eight times that of the sealed cavity in the figure. The total number of rotor rotations and the speed of rotation are transmitted to the counting mechanism by the sealed coupling. Then there is pointer display and word wheel accumulation, you can know that it passes through the pipeline Total amount of liquid.
A pulse transmitter can also be installed in the counting mechanism, which becomes a flow meter with a signal.
Matching with the company’s electric display instrument, it can realize remote transmission (quantity, accumulation, instant and other functions) automatic measurement and control.
Read more about: Liquid Flow Meters Guide
Gear types of PD flowmeter:
SPUR GEAR
In Spur gear positive displacement flow meters, fluid travels around two round gears and is pushed through the meter’s internal chamber from inlet to outlet. The discrete volume of liquid trapped between each gear tooth is measured, as opposed to the Oval gear meter where a much larger volume between gears is swept through the chamber.
HELICAL GEAR
Possibly the most accurate PD meter in which two intersecting cylindrical bores are fitted with two interlocking helical screw-shaped gears. Because gear orientation is inline with flow, as the fluid passes through, the gears rotate with very little pressure drop. These flow meters are highly accurate over wide flow ranges and are compatible with very high viscosity fluids.
ROTARY PISTON
In this design a rotary piston oscillates in the circular internal chamber displacing a fixed amount of fluid with each rotation. This style accommodates ultra low flows and high flows, as well as high pressures.
Extended reading: Cylinder Gear flow meter for micro flow measurement.
More Featured PD Flow Meters
Sino-Inst, Manufacuturer for Helical Gear-PD Flow Meters. For example: crude oil flowmeter, diesel flowmeter, gasoline flowmeter.
Sino-Inst’s Helical Gear-PD Flow 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.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Helical Gear-PD Flow Meter for high viscosity liquid|0.2/0.5
PD Flow Meter is referred to as positive displacement flowmeter. Helical Gear-PD Flow Meter is also called, spiral double rotor flowmeter, LLT, LZ double rotor flowmeter or UF-Ⅱ spiral rotor flowmeter.
Product SKU: Helical Gear-PD Flow Meter
Product Brand: Sino-Inst
Product Currency: USD
Product Price: 600
Price Valid Until: 2059-09-30
Product In-Stock: InStock
5
Helical Gear-PD Flow Meter for high viscosity liquid|0.2/0.5
PD Flow Meter is referred to as positive displacement flowmeter. Helical Gear-PD Flow Meter is also called, spiral double rotor flowmeter, LLT, LZ double rotor flowmeter or UF-Ⅱ spiral rotor flowmeter.
Product SKU: Helical Gear-PD Flow Meter
Product Brand: Sino-Inst
Product Currency: USD
Product Price: 600
Price Valid Until: 2059-09-30
Product In-Stock: InStock
5