What is Bi-Rotor Positive Displacement Flowmeter ?

Helical gear flow meters are typical volumetric flow measuring instruments which directly measure the quantity of flowing liquid by means of a couple of rotors known as helical rotors. It is a kind of positive displacement flow meters according to Roots principle, The double case combines the rugged durability and long service life of the BiRotor flow meter.

Helical gear flow meter is a kind of bi rotor flow meter positive displacement, it can be mechanical type flow meter, or equipped with electronic BiRotor transmitters and digital display and frequency to current converters are available for remote totalization, recording and presetting of metered volumes.
They may be used for custody transfer purposes, operating controls and for the many other needs of the petroleum, chemical, pharmaceutical industry, etc.

BiRotor positive displacement meter features:

• No pulsation
• Low noise
• High accuracy
• High reliability
• Large turn down ratio
• Small pressure loss
• Can measure fluids with max 3500 cp viscosity, used as high viscosity Bi rotor positive displacement flow meter
• Can work on high temperature fluids ( max 200 degrees Celsius )
• Easy calibration and easy installation

Helical Gear flow meter Technical Specifications

• 1. Accuracy level: 0.5%, 0.2%, high accuracy flow meter.
• 2. The temperature of the measured liquids: with high temperature radiator, max temperature can reach 250 °C, can be made into high temperature flow meter.
• 3. Ambient temperature can be -41 ° C ~ +60 ° C
• 4. Repeatability error: the repeatability error of the flowmeter does not exceed 1/3 of the basic error
• 5. Flange standard: DIN ,PN16,PN25,PN40,PN64, JIS standard,10K,30K, ANSI,150LB,300#,60 LB standard.,etc. Can be made into high pressure positive displacement flow meter.
• 6. Mechanical positive displacement flow meter or option with electronic transmitter to have digital display, pulse output or 4-20mA output; digital output RS485, MODBUS or HART protocol;
• 7. Bi rotor flow meter flow meter size: 1inch, 2”, 3 inch dial BiRotor flow meter, 4 inch helical gear flow meter, 6 inch positive displacement flow meter, 8 inch Bi rotor flow meter, DN200 helical gear flow meter, 10 inch Brodie International BiRotor Positive Displacement Flow Meter, 12” Positive Displacement Flow Meters;
• 8. Material options for Bi-rotor flow meter: cast iron, cast steel, stainless steel 304, SUS 316;
• 9. Flow range (below is typical flow range for diesel volumetric flow measurement)

1 inch Bi-rotor flow meter: 4.4-39.6 GPM
DN50 ( 2 INCH) dial PD flow meter: 5-40 m3/h
DN80 ( 3 Inch) :1.25-10.5 BPM ( barrel per minute)
DN100 ( 4” BiRotor flow meter sensor): 17-150 cubic meter per hour
6 inch BiRotor positive displacement meter: 25-250 m3/hr
8 inch Helical gear flow meters: 5132-52325 bbl/day
10 “ dial size bi-rotor flow sensor : 50-500 m3/h
12 inch PD flow meter: 23775-211338 GPH  ( Gallon per hour)

Only Cummulative total display Non resettable total (A5) with GF transmitter (output pulse or 4-20mA)	Cummulative total display Resettable Total (A6 ) With GF transmitter (Output Pulse or 4-20mA)	Digital display,output pulse or 4-20mA or with MODBUS  has cummulative total and flow rate display 24V or 12V DC power supply, BELZ series

Model Selection

Item	Code	Description
Mark	LLT	Helical gear flow meter
Flow meter size and flow range		From DN25 to DN300.refer to flow range table 1 &2
Special function	S	Double bodies
	U	With heating jacket
	T1	High temperature:120~250 °C
	T2	High temperature : 60~120 °C
Housing Material	E	Cast steel
	B	Stainless steel 304
	C	Stainless steel 316
Rotor Material	A	Cast iron
	B	Stainless steel 304
	C	Stainless steel 316
	L	Aluminium alloy
Special Flange	S	Flange shrink
	K	Flange expand
Pressure Rating	.2/	1.6Mpa
	.3/	2.5Mpa
	.4/	4.0 Mpa
	.6/	6.3Mpa
Register	A5	Mechanical register
	A6	Mechanical register with return to zero function
	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 totalized flow ,24V DC, 4-20mA output,4-wire, Explosion proof.
	BELZ-4	Digital indicator, instant and totalized flow ,24V DC, 4-20mA output, Hart, Explosion proof.
	M	Big digits register with return to zero function
	X	Other functions
Adjuster	GF	External Fine adjuster
Signal Generator	GF-1	Only for A or A6 register, Pulse output,3-wire, Explosion proof.12V DC power supply
	GF-II	Only for A or A6 register, Pulse output,3-wire, Explosion proof.24 V DC power supply
	MF	Only for A or A6 register, 4-20mA output, Explosion proof.24 V DC power supply
Accuracy	J	High accuracy 0.2%
	J2	High accuracy 0.3%

BiRotor positive displacement meter applications:

Helical gear flow meters are widely used in petroleum, chemical industry, metallurgy, electric power, transportation, shipbuilding, oil depot, terminal, tank truck and other departments, especially suitable for crude oil, refined oil, light hydrocarbon and other industrial liquids, it is also good for high viscosity liquid flow measurment, it is high viscosity flow meter.
Petroleum industry
BiRotor positive displacement meter  can take industrial volumetric flow measurement of following liquid: asphalt, crude oil, gasoline, heavy oil, jet 4 fuel, light oil, liquefied petroleum gas, lubricants, kerosene, naphtha, paraffin liquid flow measurement applications
Chemical industry
By choosing different material of biRotor positive displacement meter, PD flow meter can also take measurement of below liquid , even corrosive or aggressive liquid: Acetic acid, alcohol, ammonia, liquid CO2, caustic soda, softened water, formaldehyde, methanol, methyl chloride, naphthalene, nitric acid, lacquer, salt solution, solvent, sulfuric acid, monomer vinyl chloride, monomer vinyl acetate
Power industry
Trough No. C oil, crude oil flow rate measurement, softened water, heavy oil, naphtha
Shipbuilding and steelmaking industry
BiRotor positive displacement Flow meter can be used for marine boiler fuel oil, insulation oil, heavy oil, light oil, tar, gas turbine oil, water
Petroleum industry
Bi-rotor flow meter can measure below fluids flow rate: acetaldehyde, acetone, acrylic ester, benzene, butanol, ethanol, ethylene, liquefied petroleum gas, maleic anhydride, phthalic anhydride, propylene, styrene, toluene, xylene
Food industry
Alcohol, alcoholic beverages, butter, chocolate, animal fat, fatty acid, majonese, salt solution, vegetable oil, vinegar, water flow measurement.
Pharmaceutical industry
By choose different flow sensor material , helical gear flow meter can be also used for acid solution, caustic soda, softened water, dilute hydrochloric acid, dilute sulfuric acid, concentrated sulfuric acid, phosphoric acid
Other
Antifreeze solution, DDBS, softened water, ink, maleic anhydride, methyl toluene acrylate, plasticizer, water

BiRotor positive displacement Flow meter Price cost

BiRotor flow meter price is determined by many factors, such as brand, Brodie International POSITIVE DISPLACEMENT (PD) FLOW METERS / BiRotor will cost more , and Silver Automation Instruments sell low price but very quality Birotor flow meter from China positive displacement flow meter factory . Even from the same China flow meter manufacture, the price also varies according to the helical gear flow meter size , flow sensor material, flowmeter functions and so on. For example 1 inch Bi-Rotor flow meter with cast iron rotor and cast steel housing , mechanical register, price starts from dollars $ 1500 . Welcome to send specify inquiry to obtain the low cost flow meter price.

Helical gear flow meter installation

• 1.       The filter should be installed before the flowmeter, the fluids flow direction should be the same direction as the arrow on the flow meter body.
• 2.       When the liquid to be tested contains gas, a gas separator should be installed before the flow meter.
• 3.       When the flowmeter is properly installed, if the reading is not easy to see, turn the counter to 180° or 90°.
• 4.       Before running the flow meters, we can push the gears with stick, if the gear is not working, users can soaked the flow meter with gasolines.
• 5.       The throttle valve should be installed at the inlet of the flow meter. The opening and closing valve should be installed at the exit. When using the open and close valve, start slowly. Do not open the valve suddenly.
• 6.       It is strictly forbidden to use the sweeping steam to pass the flowmeter.
• 7.       A bypass pipe should be used if the flow meter is for continuous measurement
• 8.       Before the flowmeter is installed, the pipeline must be flushed. When flushing, use straight pipe section (instead of the flowmeter position) to prevent welding slag and debris from entering the flowmeter.
• 9.       It is strictly forbidden to use water to check and calibrate the flow meter ( cast iron or cast steel material) .
• 10.   The normal operation flow is better between 40~80% of the max flow.
• 11.   Flow meter installation direction