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Jiangsu Hongqi Automation Equipment Co., Ltd
HQ-LZ-250 metal tube float flowmeter
NegotiableUpdate on 06/06
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Overview
Introduction: The HQLZ-250 metal tube float flowmeter adopts a variable area measurement principle and is suitable for measuring liquids and gases. All metal structure, including indicator type, electric remote transmission type, corrosion-resistant type, high-voltage type, jacket type, and explosion-proof type. Standard with 0-10mA and 4-20mA
Product Details
Brief introduction:
The HQLZ-250 metal tube float flowmeter adopts a variable area measurement principle and is suitable for measuring liquids and gases. All metal structure, including indicator type, electric remote transmission type, corrosion-resistant type, high-voltage type, jacket type, and explosion-proof type. It has standard analog signal output and on-site indication of 0-10mA and 4-20mA. Accumulation, digital communication, on-site modification of measurement parameters, different power supply functions, with magnetic filters and special specifications. Widely used in industries such as petroleum, chemical, power generation, pharmaceuticals, food, water treatment, etc. During the flow measurement process under complex, harsh environmental conditions, and various media conditions.
HQLZ-250 metal tube float flowmeter
Overview of HQLZ-250 Metal Tube Float Flow Meter
1. The HQLZ-250 metal tube float flowmeter adopts a variable area measurement principle and is suitable for measuring liquids and gases. All metal structure, including indicator type, electric remote transmission type, corrosion-resistant type, high-voltage type, jacket type, and explosion-proof type. It has standard analog signal output and on-site indication of 0-10mA and 4-20mA. Accumulation, digital communication, on-site modification of measurement parameters, different power supply functions, with magnetic filters and special specifications. Widely used in industries such as petroleum, chemical, power generation, pharmaceuticals, food, water treatment, etc. During the flow measurement process under complex, harsh environmental conditions, and various media conditions.
2. Metal tube float flowmeter is a commonly used variable area flow measurement instrument in industrial automation process control. It has the characteristics of small size, large detection range, and easy use. It can be used to measure the flow rate of liquids, gases, and vapors, especially suitable for measuring the flow rate of low velocity and low flow media.
Characteristics of the Measurement Section of HQLZ-250 Metal Tube Float Flow Meter
1. Sturdy all metal structure design float flowmeter
2. Measurement tube indicator designed with independent concept
3. Stainless steel, Hastelloy, titanium, PTFE material measurement systems can be selected
4. Low pressure loss design
5. Short stroke, small structural design, total instrument height of 250
6. Magnetic coupling structure ensures data transmission and signal stability
7. Insulation or heat tracing jacket
8. Vertical, horizontal, and various installation methods are more suitable for different usage scenarios
9. Suitable for flow measurement of small caliber and low velocity media
10. Reliable work, minimal maintenance, and long lifespan
11. Not high requirements for straight pipe sections
12. Wide traffic ratio 10:1
13. Dual row large LCD display, optional on-site instantaneous/cumulative flow display, can be equipped with backlight
14. Single axis sensitive indication
15. Non contact magnetic coupling transmission
16. All metal structure, suitable for high temperature, high pressure, and highly corrosive media
17. Can be used in flammable and explosive hazardous environments
18. Choose a two-wire system, battery, and AC power supply method
19. Multi parameter calibration function
20. Equipped with data recovery, data backup, and power down protection functions
Main technical parameters of HQLZ-250 metal tube float flowmeter
Measurement range: Water (20 ℃) 1-200000 l/h
Air (20 ℃, 0.1013MPa) 0.03-4000m3/h; Refer to the flow chart, special flow rates can be customized
◇ Range ratio: Standard 10:1
◇ Accuracy: Standard type 1.0 level; Special type 0.5 level
◇ Pressure rating: Standard type: DN15-DN50 4.0MPa DN80-DN200 1.6MPa
Special type: DN15-DN50 25MPa DN80-DN200 16MPa
The pressure rating of the jacket is 1.6MPa; Special types should be negotiated with the factory before selection and ordering
Pressure loss: 7kPa-70kP
◇ Medium temperature: Standard type: -80 ℃ -+200 ℃: PTFE: 0 ℃ -85 degrees
High temperature type: * up to 300 ℃
◇ Medium viscosity: DN15: η<5mPa. s (F15.1-F15.3)/η<30mPa. s (F15.4-F15.8)
DN25：η<250mPFa.s
DN50-DN150：η<300mPa.s
◇ Environmental temperature: pointer type -40 ℃ -+120 ℃
◇ Connection form: Standard type: DIN2501 standard flange
Special type: Any standard flange or thread specified by the user
◇ Cable interface: M20 * 1.5
Power supply: Standard type: 24VDC two-wire 4-20mA (10.8VDC-36VDC)
◇ Alarm output: upper or lower limit instantaneous flow alarm, collector open circuit output (* large) 100mA@30VDC Internal impedance of 100 ohms
Relay output (contact capacity) 1A@30VDC perhaps 0.25A@250VAC perhaps 0.5A@125VAC ）
◇ Pulse output: Accumulated pulse output, with small intervals of 50 milliseconds
◇ LCD display: Instantaneous flow display value range: 0-50000
Accumulated traffic display value range: 0- (with decimal point)
◇ Protection level: IP65
Explosion proof mark: intrinsically safe type ia Ⅱ CT5; Explosion proof type d Ⅱ BT6
Measurement range of HQLZ-250 metal tube float flowmeter
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Corrosion resistant diameter
DN（mm）
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Ordinary diameter
DN（mm）
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Flow range
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*High pressure loss
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||
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airm3/h 20℃
0.101325 MPa
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waterL/h 20℃
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airkPa）
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Water（kPa）
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||
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15
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15
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0.07～0.7
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2.5～25
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7.1
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6.5
|
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0.11～1.1
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4.0～40
|
7.2
|
6.5
|
||
|
0.18～1.8
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6.0～60
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7.3
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6.6
|
||
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0.28～2.8
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10～100
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7.5
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6.6
|
||
|
0.40～4.0
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16～160
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8.0
|
6.8
|
||
|
0.70～7.0
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25～250
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10.8
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7.2
|
||
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1.00～10
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40～400
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10
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8.6
|
||
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25
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1.60～16
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60～600
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14
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11.1
|
|
|
25
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3.00～30
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100～1000
|
7.7
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7
|
|
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4.50～45
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160～1600
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8.8
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8
|
||
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7.00～70
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250～2500
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12
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10.8
|
||
|
50
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11～110
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400～4000
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19
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15.8
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|
|
50
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18～180
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600～6000
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8.6
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8.1
|
|
|
25～250
|
1000～10000
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10.4
|
11
|
||
|
80
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40～400
|
1600～16000
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15.6
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17
|
|
|
80
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75～750
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2500～25000
|
|
8.1
|
|
|
100
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100～1000
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4000～40000
|
|
9.5
|
|
|
100
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150～1500
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6000～60000
|
|
10
|
|
|
150
|
125
|
|
8000～80000
|
|
|
|
|
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100000～1000000
|
|
|
|
|
|
150
|
|
15000～150000
|
||
Conversion indicator
The converter is actually a scale that converts the height of the float inside the cone tube into the corresponding volumetric flow rate.
From the output signal, there are two types: local display type and remote signal output type:
Local display type: It is coupled with the magnetic steel inside the float by the following magnetic steel in the local indicator, and rotates. At the same time, the electric pointer indicates the current flow rate through the dial
The flow coefficient of the alpha instrument in the formula varies depending on the shape of the float;
When the measured fluid is a gas, the gas expansion coefficient is usually ignored due to the small correction amount of this coefficient, and it has been included in the flow coefficient through verification. If it is a liquid, ε=1
△ F circulation annular area, m2 ；
G local gravity acceleration, m/s2；
The volume of the Vf float, including any extended bodies, should also be included, m3；
ρ f float material density, kg/m3；
The density of the fluid being measured, such as the density of gas on the upstream cross-section of the float, kg/m3；
The cross-section at the working diameter (* large diameter) of the Ff float, m2；
Gf float weight, kg。
The relationship between the circulating annular area and the float height is shown in equation (3). When the structural design is determined, d and β are constants.
There is a quadratic term for h in the equation, and this nonlinear relationship cannot be ignored. It can only be considered approximately linear when the cone angle is very small.
In the formula, d represents the float multiplied by the large diameter (i.e. the working diameter), m;
The height of the float rising from the inner diameter of the cone tube is equal to the height of the float rising from the larger diameter, m;
Cone angle of β - cone tube;
a. B is a constant
According to formulas (1), (2), and (3), under certain conditions, there is a certain proportional relationship between the height of the float inside the cone tube and the volumetric flow rate. By reading the height of the float, the corresponding volumetric flow rate can be determined. Then, through a converter, the height of the float can be converted into the scale corresponding to the volumetric flow rate. This is the detection principle of the metal tube float flowmeter.
Intelligent remote transmission type, coupled with the moving magnetic steel in the intelligent indicator and the magnetic steel inside the float, rotates and drives the sensing magnetic steel and pointer. Through a magnetic sensor, the magnetic field changes are converted into electrical signals, which are then A/D converted, digital filtered, processed by a microprocessor, D/A output, and LCD liquid crystal display to display the instantaneous flow rate and cumulative flow rate. (As shown in the following figure)
Intelligent remote transmission type, coupled with the moving magnetic steel in the intelligent indicator and the magnetic steel inside the float, rotates and drives the sensing magnetic steel and pointer. Through a magnetic sensor, the magnetic field changes are converted into electrical signals, which are then A/D converted, digital filtered, processed by a microprocessor, D/A output, and LCD liquid crystal display to display the instantaneous flow rate and cumulative flow rate. (As shown in the following figure)
Calculation of Diameter, Float Number, and Scale of Metal Tube Float Flow Meter
1. Calculation method
(1) Based on the data provided by the user, select the appropriate formula to calculate the flow rate Qs of the corresponding calibration medium:
Among them: Qs - flow rate of calibration medium (water or air) under standard conditions (20 ℃, 0.1013Mpa)
Q-user medium flow K-correction factor
(2) Based on the calculated Qs value, check the flow meter to determine the selected float number and the diameter of the measuring tube (the values in the flow meter are the flow values of water or air under standard conditions)
(3) After determining the diameter of the measuring tube and the float number, it is recommended to use the following formula to determine the upper limit value Q of the flow scale of the measured medium:
Among them, Qi selects the maximum value of the water or air flow corresponding to a certain float number in the flow meter.
(4) Due to the lack of consideration for viscosity correction in the calculation, there may be discrepancies with the results calculated by the factory.
2. Determination of correction coefficient K
(1) For liquid media
a、 If Q is the volumetric flow rate of liquid, calculate K using the following equation:
b、 If Q is the liquid mass flow rate, calculate K using the following formula:
b、 If Q is the liquid mass flow rate, calculate K using the following formula:
Among them: ρ f: selected float density (g/cm3)
The density of the stainless steel float is 7.8
The density of polytetrafluoroethylene float (PTFE) is 3.4
The density of nickel based alloy (Hastelloy) is 8.3
ρ: Density of the tested medium
(2) For gas media
a、 If Q is the volumetric flow rate of gas at standard conditions (20 ℃, 0.1013Mpa), then calculate K using the following equation:
b、 If Q is the volumetric flow rate of gas in the operating state, then calculate K using the following equation:
c、 If Q is the mass flow rate of gas, then calculate K using the following equation:
b、 If Q is the volumetric flow rate of gas in the operating state, then calculate K using the following equation:
c、 If Q is the mass flow rate of gas, then calculate K using the following equation:
In the above categories:
ρ: Density of the tested medium: Density of the tested gas medium at 20 ℃ and 0.1013MPa (kg/m3)
P: Excellent pressure of the tested gas medium (MPa)
T: Excellent temperature of the tested gas medium (K)
ρ 0: Density of air at 20 ℃ and 0.1013MPa (1.205kg/m3)
P 0: Excellent pressure of calibration medium (0.1013MPa)
T 0: Excellent temperature of calibration medium (293.15K)
d、 Auxiliary density conversion formula
Among them: ρ st: Density of the tested gas medium under standard conditions (Kg/m3)
ρ t: Density of the tested gas medium in operating state (Kg/m3)
Tt: Excellent temperature of the tested gas medium under operating conditions (K)
Pt: Excellent pressure of the tested gas medium under operating conditions (MPa)
P0: Excellent pressure of the tested gas medium under standard conditions (MPa)
T0: Excellent temperature of the tested gas medium under operating conditions (K)
Structure of metal tube float flowmeter
1. High temperature structure (G-type)
High temperature structure type (G-type) is used for flow measurement of media with high or low temperatures that require insulation measures for the measuring tube. The high-temperature structure increases the distance between the measuring tube and the indicator to enhance heat dissipation and increase the thickness of the insulation material, ensuring that the indicator operates within the allowable ambient temperature range. Select the "G" type.
The G-type metal tube float flowmeter can measure the flow rate of media with temperatures ranging from -80 ℃ to+300 ℃.
2. Structure with damper device (Z-type)
The damper structure type is used for measuring medium flow when the inlet flow rate (pressure) of the flowmeter is unstable, especially for gas measurement. Its structure is shown in the figure
3. Clamp type structure (T-shaped)
The jacket type structure is used for flow measurement of media that require heat tracing or cooling (such as high viscosity and easy crystallization). By heating or cooling the medium in the jacket, low boiling and low freezing point fluids are prevented from vaporizing and crystallizing.
The import and export connection of the heat tracing medium should use HG20594-97 DN15 PN1.6 flange for the standard type, and other flange specifications can be indicated by the manufacturer. The pressure rating of the jacket is 1.6MPa
The structure of the jacketed flowmeter is shown in the FA standard flowmeter flange and external dimension diagram.
4. High voltage structure (Y-shaped)
High pressure type structure is used for flow measurement when the measured medium pressure is greater than the standard pressure level. The high-voltage structure is shown in the following figure. At present, the high pressure of the FFM64 series can reach 32MPa. In addition, high-pressure flow meters can be provided with built-in magnetic filter types, with an installation height of 350mm. FA, FB, and FC types have a maximum pressure of 10MPa
High voltage type external dimensions and weight
High voltage type external dimensions and weight
Note: 1. G is the weight of the instrument (kg)
Schematic diagram of metal tube float flowmeter
Installation structure diagram of metal tube float flowmeter
Installation structure diagram of metal tube float flowmeter
