Camellia oil flowmeterThe sensor (hereinafter referred to as the sensor) is based on the principle of torque balance and belongs to the velocity flow meter. Sensors have the characteristics of simple structure, lightweight, high accuracy, good reproducibility, sensitive response, and easy installation, maintenance, and use. They are widely used in industries such as petroleum, chemical, metallurgical, water supply, and papermaking, and are ideal instruments for flow measurement and energy conservation.


Sensors and display instruments are used in conjunction, suitable for measuring liquids in closed pipelines that do not corrode stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, hard alloys, and have no impurities such as fibers or particles. If matched with display instruments with special functions, quantitative control, over limit alarm, etc. can also be performed. The explosion-proof type (ExmIIT6) of this product can be used in environments with explosive hazards.
The sensor is suitable for media with viscosity less than 5 × 10-6m2/s at operating temperature. For liquids with viscosity greater than 5 × 10-6m2/s, the sensor needs to be calibrated with real liquid before use.
If users require special forms of sensors, they can negotiate to place an order. If explosion-proof sensors are needed, they should be explained in the order.

2、 Basic Camellia Oil Flow Meter

2Structural features and working principle
21.1 Structural Features
The sensor is a hard alloy bearing thrust type, which not only ensures accuracy and improves wear resistance, but also has the characteristics of simple structure, firmness, and easy disassembly and assembly.
21.2 Working principle
Camellia oil flowmeterThe fluid flows through the sensor housing. Due to the angle between the blades of the impeller and the flow direction, the impulse of the fluid causes the blades to have a rotational torque. After overcoming the friction torque and fluid resistance, the blades rotate. After the torque is balanced, the speed stabilizes. Under certain conditions, the speed is proportional to the flow rate. Due to the magnetic conductivity of the blades, they are in the magnetic field of the signal detector (composed of permanent magnet and coil). The rotating blades cut the magnetic field lines and periodically change the magnetic flux of the coil, causing electrical pulse signals to be induced at both ends of the coil. This signal is amplified and shaped by the amplifier, forming a continuous rectangular pulse wave with a certain amplitude, which can be transmitted to the display instrument remotely to display the instantaneous flow rate or total amount of the fluid. Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor, and the flow equation is:

In the formula:
F - Pulse frequency [Hz]
K - the instrument coefficient of the sensor [1/m3], given by the calibration sheet. If [1/L] is used as the unit
Q - Instantaneous flow rate of fluid (under working conditions) [m3/h]
3600- Conversion factor
Camellia oil flowmeterThe instrument coefficient of each sensor is filled in the calibration certificate by the manufacturer, and the k value is set in the matching display instrument to display the instantaneous flow rate and cumulative total amount.


3、 Basic parameters and technical performance of camellia oil flowmeter

Instrument diameter (mm)	Normal flow range (m3/h)	Expand flow range (m3/h)	Conventional withstand pressure (MPa)	Specially designed pressure resistance level (MPa) (flange connection method)
DN 4	0.04～0.25	0.04～0.4	6.3	12. 16, 25
DN 6	0.1～0.6	0.06～0.6	6.3	12. 16, 25
DN 10	0.2～1.2	0.15～1.5	6.3	12. 16, 25
DN 15	0.6～6	0.4～8	6.3, 2.5 (flange)	4.0, 6.3, 12, 16, 25
DN 20	0.8～8	0.45～9	6.3, 2.5 (flange)	4.0, 6.3, 12, 16, 25
DN 25	1~10	0.5～10	6.3, 2.5 (flange)	4.0, 6.3, 12, 16, 25
DN 32	1.5～15	0.8～15	6.3, 2.5 (flange)	4.0, 6.3, 12, 16, 25
DN 40	2~20	1~20	6.3, 2.5 (flange)	4.0, 6.3, 12, 16, 25
DN 50	4~40	2~40	2.5	4.0, 6.3, 12, 16, 25
DN 65	7~70	4~70	2.5	4.0, 6.3, 12, 16, 25
DN 80	10~100	5~100	2.5	4.0, 6.3, 12, 16, 25
DN 100	20~200	10~200	2.5	4.0, 6.3, 12, 16, 25
DN 125	25~250	13~250	1.6	2.5, 4.0
DN 150	30~300	15~300	1.6	2.5, 4.0
DN 200	80~800	40~800	1.6	2.5, 4.0

4、 Instrument selection

Camellia oil flowmeter model								Explanation
LWGY─	□	/□	/□	/□	/□	/□	/□
state-owned call open up or clear out by poking or jabbing footpath	4							4mm, standard range 0.04-0.25m3/h, wide range 0.04-0.4m3/h
	6							6mm, standard range 0.1-0.6m3/h, wide measuring wheel 0.06-0.6m3/h
	10							10mm, standard range 0.2-1.2m3/h, wide range 0.15-1.5m3/h
	15							15mm, standard range 0.6-6m3/h, wide range 0.4-8m3/h
	20							20mm, standard range 0.8-8m3/h, wide range 0.4-8m3/h
	25							25mm, standard range 1-10m3/h, wide range 0.5-10m3/h
	32							32mm, standard range of 1.5-15m3/h, wide range of 0.8-15m3/h
	40							40mm, standard range 2-20m3/h, wide range 1-20m3/h
	50							50mm, standard range of 4-40m3/h, wide range of 2-40m3/h
	65							65mm, standard range of 7-70m3/h, wide range of 4-70m3/h
	80							80mm, standard range 10-100m3/h, wide range 5-100m3/h
	100							100mm, standard range of 20-200m3/h, wide range of 10-200m3/h
	125							125mm, standard range of 25-250m3/h, wide range of 13-250m3/h
	150							150mm, standard range of 30-300m3/h, wide range of 15-300m3/h
	200							200mm, standard range of 80-800m3/h, wide range of 40-800m3/h
type		B						Battery powered on-site display type
		C						On site display: 4-20mA two-wire current output
		C1						On site display/RS485 communication protocol
		C2						On site display/ART communication protocol
accuracy class			05					Accuracy level 0.5
			10					Accuracy level 1.0
Turbine Type				W				Wide range turbine
				S				Standard turbine
texture of material					S			304 stainless steel
					L			316 (L) stainless steel
explosion-proof						E		Explosion proof type (explosion-proof grade: Exd Ⅱ BT6)
pressure rating							N	Conventional (refer to Table 2)
							H(x)	High voltage (refer to Table 2)

(1) Turbine flow meters should be used with caution. Some chemical materials that are prone to crystallization can be measured normally under normal temperature conditions. Due to the good heat tracing and insulation of the pipes that transport the fluid, they will not crystallize during insulation work. However, the measuring tube of the turbine flow meter sensor is difficult to implement heat tracing and insulation. Therefore, when the fluid flows through the measuring tube, it is easy to cause a layer of solid to form on the inner wall due to cooling. Due to the crystallization problem of using other principle flow meters for measurement, in the absence of other better methods, a "ring" turbine sensor with a very short measuring tube length can be selected, and the upstream pipeline heat tracing insulation of the flow meter can be strengthened. In terms of pipeline connection, the disassembly and assembly of flow sensors need to be convenient, and once crystallized, they can be easily removed for maintenance.
(2) The liquid inside the tube is not filled due to a lack of back pressure or poor positioning of the flow sensor device, resulting in the measurement of the liquid inside the tube not being filled. The problem phenomenon varies depending on the level of non filling and activity. If a small amount of gas flows in layers or waves in the water pipeline, the problem is manifested as an increase in error, that is, the measured flow value does not match the actual value; If the activity is a bubble flow or plug flow, the problem phenomenon will not only be inconsistent with the measured value and the actual value, but also show output shaking due to the gas phase covering the surface of the electrode in an instant; If the flow cross-sectional area of the gas phase increases locally during the layered activity of the pipeline, that is, if the liquid is not fully filled and the pipe level increases, there will also be output shaking. If the liquid is not fully filled and the pipe situation is severe, causing the liquid level to be below the electrode, there will be an output over filling phenomenon.
(3) The liquid in the turbine flowmeter contains solid phase, and the liquid contains solids such as powder, particles, or fibers, which may cause problems;
① Slurry noise;
② Surface contamination of electrodes;
③ Conductive or insulating stacking layer covers the electrode or lining;
④ The lining is worn or covered by debris, reducing the cross-sectional area for flow.
Maintenance knowledge of turbine flowmeter sensor
Turbine flowmeters are widely used in measurement and control systems in fields such as petroleum, chemical, metallurgical, and scientific research. Turbine flow sensors equipped with sanitary fittings can be applied in industries such as pharmaceuticals and food. The structure of the intelligent integrated turbine flowmeter is explosion-proof design, which can display the total flow rate, instantaneous flow rate, and flow saturation percentage. The battery adopts a long-lasting lithium battery, and the service life of a single function odometer battery can reach more than 5 years, while the service life of a multifunctional display meter battery can also reach more than 12 months.
The integrated meter head can display a wide range of flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc. It can set fixed pressure and temperature parameters to compensate for gases. In situations where pressure and temperature parameters do not change significantly, this instrument can be used for fixed compensation accumulation.
The maintenance of the sensor part of the turbine flowmeter should pay attention to the following points:
1. Before installing the sensor, blow or manually turn the impeller to quickly rotate and observe for any display. When there is a display, install the sensor. If there is no display, check the relevant parts and eliminate the fault.
2. When in use, the tested medium should be kept clean and free of impurities such as fibers and particles.
3. When starting to use a turbine flow sensor, the sensor should be slowly filled with medium before opening the outlet valve (which should be installed at the back of the flow meter). It is strictly prohibited for the sensor to be impacted by high-speed fluid when it is in a state of no medium.
4. The maintenance cycle for turbine flow sensors is generally six months. During maintenance and cleaning, please be careful not to damage the parts inside the measuring chamber, especially the impeller. Please pay attention to the position relationship between the guide components and the impeller during assembly.
5. When the turbine flow sensor is not in use, the internal medium should be cleaned, dried, and protective covers should be added at both ends of the sensor to prevent dust and dirt from entering, and then stored in a dry place.
6. The filter equipped with the turbine flowmeter shall be cleaned regularly. When not in use, the internal medium shall be cleaned. Like the sensor, it shall be sealed with a dust boot and stored in a dry place.