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.

Helical Gear-PD Flow Meter

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”.

Features of Helical Gear-PD Flow Meter

  1. Notable features such as no pulsation, extremely low noise, high precision, high reliability, large flow, and strong environmental adaptability.
  2. The spiral rotor flowmeter can indicate cumulative flow, instantaneous flow, single flow, etc. on site.
  3. It can output pulse signal, 4-20mA or 1-5V analog signal, 4-20mA+HART, MODBUS, support 232,485 communication, etc.
  4. Combined with mechanical batch controller or electronic batch controller, it can realize various functions such as different types of filling and batch control.
  5. The spiral rotor rotates at a constant speed in the metering cavity, and the flow is constant.
  6. The spiral rotor rotates at a constant speed and the fluid pulsation is small.
  7. The sending pulse is stable and accurate.
  8. Various counters, speed regulators and external fine regulators can be configured.
  9. Can be installed vertically (limited to DN200 or less, please specify when ordering)
  10. 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.
  11. 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.
  12. Long service life, high accuracy and strong reliability.
  13. The internal pressure loss is extremely small.
  14. 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.
  15. 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
Accuracy0.2/0.5 level
Pressure loss0-1000mPa.s‹80KPa; 1000-20000mPa.s‹150KPa
Nominal pressure1.6, 2.5, 4.0, 6.4MPa
temperature range-20℃-+80℃, +80℃+150℃, +150℃-+250℃
Medium viscosity0-2000mPa.s
Ambient temperature-30℃-+70℃
Connecting flangeGB9115.0719-2000 JB/TB2-94; It can also be manufactured according to user-specified flange standards
Photoelectric pulse (current) converterExplosion-proof mark: ExdⅡBT4 ExdⅡBT4 (excluding acetylene)
Electronic counterExplosion-proof mark: ExdⅡBT4 (without acetylene)
Protection levelIP65

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
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.

How does a PD meter work?

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.

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.

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Please provide your measurement parameters or details. Sino-Instrument support customer customization and OEM
Please provide your measurement parameters or details. Sino-Instrument support customer customization and OEM
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

Editor's Rating:
5

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