Product Description:
1、 Product Overview:
The LL series waist wheel flowmeter is a volumetric flow measurement instrument, with a measuring part made of stainless steel material and strong anti-corrosion performance. It can be used for flow measurement of corrosive crude oil or other corrosive media containing water. This flowmeter can display accumulated flow on site and is equipped with a remote transmission output interface. It can also be paired with a photoelectric converter to output electrical pulse signals or analog signals. It can be used in conjunction with a flow integrator for remote measurement, display, and control.
Its structural feature is that there is a measuring chamber inside the casing of the flowmeter, and there are one or two pairs of waist wheels that can rotate tangentially in the measuring chamber. A pair of transmission gears are coaxially installed outside the flowmeter housing with two search wheels, which mesh with each other to enable the two waist wheels to interlock with each other.
It can accumulate flow on site and is equipped with a remote transmission output interface. It can also be equipped with a photoelectric converter to output pulse signals or analog signals, which can be matched with a flow integrator for remote measurement display and control.
The LL series waist wheel flowmeter mainly consists of a measuring chamber, a sealed coupling, and a counter. It can indicate cumulative flow and instantaneous flow on site, equipped with a transmitter and intelligent flow controller, and can achieve remote measurement and control. Widely used in petroleum, chemical, power, metallurgy, transportation, food processing, medicine, national defense, commercial trade and other sectors for accurate measurement of fluids such as petroleum and petroleum products, chemical solutions, etc.
2、 Working principle:
The LL series waist wheel flowmeter forms a pressure difference at the inlet and outlet of the flowmeter when the measured liquid flows through the measuring chamber, and the waist wheel rotates under the push of this pressure difference. Simultaneously, by fixing a pair of driving gears on the waist wheel shaft, the two waist wheels maintain continuous rotation. As the waist wheel rotates, the liquid is continuously discharged from the flow meter through the measuring chamber. The amount of liquid flowing through each pair is four times the volume of the measuring chamber. Through a sealed coupling and a reduction mechanism, the number of rotations is reduced and transmitted to a counter, which indicates the instantaneous flow rate and cumulative flow rate of the liquid. Installing a transmitter in the counter mechanism becomes a waist wheel with a transmitter. Paired with display instruments or microcomputer systems, it can achieve remote (quantitative, cumulative, instantaneous, etc.) automated measurement and control. Please refer to the display instrument classification manual for usage instructions.
3、 Application measurement:
LL type, can be used for flow measurement of high viscosity liquids such as pure crude oil and heavy oil;
LL-D anti sand mold can be used for flow measurement of high viscosity fluids such as sand containing crude oil and heavy oil;
The LL-F stainless steel flowmeter is made of stainless steel material for the part in contact with the medium, which has strong anti-corrosion performance and can be used for flow measurement of corrosive liquids, especially suitable for the chemical industry;
LY-C light oil type is particularly suitable for flow measurement of low viscosity fluids such as light oil and diesel.
4、 Main features:
1. The measurement accuracy is high, and the basic error can generally reach plus or minus 0.2% to plus or minus 0.5%, and can reach plus or minus 0.1% when special requirements are met. The characteristics of the flowmeter are generally not affected by the flow state, nor are they limited by the Reynolds number.
2. Can be used for flow measurement of high viscosity liquids
3. The measurement range is wide, with a typical flow range of 5:1 to 10:1
4. The wheel type counter accumulates the total amount of fluid without the need for external energy. It uses a instant noodle counter to accumulate flow with dual displays, one of which can be reset to zero, making it convenient for users to use in discontinuous metering situations.
5. There is no contact between measuring components, no wear, and a long service life.
6. The large-diameter flowmeter adopts a rotor form to reduce the operating noise and vibration of the flowmeter.
5、 Technical parameters:
1. Allowable basic error: ± 0.1%, ± 0.2%, ± 0.5%;
2. Nominal diameter DN (mm): 15-300;
3. Nominal pressure PN (M.Pa): cast iron (A), stainless steel (P) 1.0, 1.6, 2.5, 4.0, 6.3; Cast steel (E) 2.5, 4.0, 6.3, 9.6;
4. Temperature of the tested liquid:
a. Low temperature type:- 40～ +60℃；
b. Room temperature type -10 ℃ to+80 ℃;
c. Medium temperature type -10 ℃ to+200 ℃;
d. High temperature type -10 ℃~+300 ℃;
5. Measured liquid viscosity (mPa. s): 0.3-50000;
6. Pipeline connection: GB/T9118-2000 (Chinese standard flange); NIST (National Institute of Standards and Technology); BSPT (British Standard Pipe Thread): NPT (American Push Pull Pipe Thread);
7. On site display: 99999999 L (cumulative flow) 9999999.9 L (single flow); 9999999.9 L (instantaneous flow rate);
8. Output signal: pulse signal, 4-20mA, 1-5V, 4-20mA+HART protocol, MODBUS supports RS232, RS485 communication (optional);
9. Explosion proof level: EXiaIIBT5EXiaIICT5 Protection level: IP65。
6、 Installation and use:
1. A filter should be installed in front of the flowmeter, and the arrows on the two meter bodies should point in the same direction as the flow.
2. When the measured liquid contains gas, a gas separator should be installed in front of the flowmeter.
3. Regardless of whether the pipeline is installed vertically or horizontally, the waist wheel axis of the flowmeter should be installed in a horizontal position (i.e. the dial should be perpendicular to the ground).
4. If it is difficult to see the reading clearly when the flowmeter is installed correctly, the counter can be rotated 180 or 90 degrees.
5. The throttle valve should be installed at the inlet of the flowmeter, and the on-off valve should be installed at the outlet. When using the on-off valve, it should be started slowly and not suddenly opened.
6. It is strictly prohibited to use sweeping steam through flow meters.
7. In the continuous use department, a bypass pipeline needs to be added to the flow meter.
8. Before installing the flowmeter, the pipeline needs to be flushed. During flushing, a straight pipe section (replacing the position of the flowmeter) should be used to prevent welding slag, debris, etc. from entering the flowmeter.
9. It is strictly prohibited to use water to calibrate flow meters made of cast iron or steel materials.
10. The flow rate of the flowmeter shall not exceed the technical requirements during use. The flowmeter works normally at a maximum flow rate of 70-80%.
11. If the measured liquid has chemical corrosiveness, a stainless steel flowmeter should be selected. If the corrosiveness is strong, a 0Crl8Ni12MO2Ti flowmeter should be selected.
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