1、 Instrument Introduction:
Clamp on target flowmeterIt is named after its structure, which clamps the flowmeter with a matching flange and locks it in place with fasteners. The narrow width of the clamp type flowmeter pipeline makes it easy for the flowmeter to reach the fluid operating temperature in a short period of time. Therefore, it is widely used in high-temperature fluids such as liquid sulfur (liquid sulfur), liquid paraffin (liquid wax), emulsified asphalt, latex, etc. that are prone to solidification at room temperature. This type of medium has the characteristics of high viscosity, low flow rate, and easy coagulation and blockage. It is a high-temperature typeClamp on target flowmeterHas good adaptability to such media.
3、 Working principle:
Clamp on target flowmeterIt is the pressure difference generated when the medium flows in the measuring tube due to its own kinetic energy passing through the blocking element, and exerts a force on the blocking element. The magnitude of the force is proportional to the square of the medium flow velocity, and its mathematical expression is as follows:
F=CdAρ? V2/2
In the formula: the force acting on the F blocking component (kg)
Cd object drag coefficient
The axial projection area of the measuring tube by the A blocking component (mm2)
Medium density under ρ condition (kg/m3)
The average flow velocity of V medium in the measuring tube (m/s)
The force F received by the blocking element (target) is transmitted to the sensor through a rigidly connected transmission element (measuring rod), and the sensor generates a voltage signal output: V=KF
In the formula: V - voltage output by the sensor (mV), K - proportionality constant,
F - the force acting on the flow barrier (target) (kg),
After pre amplification, AD conversion, and computer processing, this voltage signal can obtain the corresponding instantaneous flow rate and cumulative total amount.
3、 Application scope:
Clamp on target flowmeterIt has been widely used in the measurement of semi water gas, coke oven gas, heavy oil, residual oil, asphalt, liquid paraffin, toluene, sulfuric acid, natural gas, flue gas, sewage, purified water and other special media.
4、 Advantages:
1. Suitable for various pipe diameters: 15-2000mm to larger.
2. Suitable for high and low temperature media: -196 ℃ -+450 ℃. Can accurately measure the flow rate of liquids, gases, vapors, viscous media, and various fluid media under various normal temperature, high temperature, and low temperature conditions.
3. Sensitivity *, capable of measuring ultra-low flow rates, capable of measuring low flow velocities of 0.08m/s.
4. Suitable for high-pressure working conditions: 0-42Mpa.
5. No movable parts, high accuracy.
6. Good repeatability, generally 0.1-0.08%, fast measurement.
7. Accurate measurement, high precision, and total measurement can reach 0.2%.
8. Good anti vibration and anti electromagnetic interference, can be used for dry calibration or weight hanging method.
9. Body material: carbon steel, 304, 316, 316L.
10. Power supply mode: 3.6V lithium battery; 24VDC power supply; Dual power supply: 3.6V lithium battery+24VDC power supply.
5、 Performance indicators:
1. Measurement range 0-400t/h;
2. Accuracy level: 0.5% FS 1.0% FS 2.0% FS;
3. Output signal: 4-20mA two-wire system output is linearly related to flow rate;
4. Power supply voltage: 12-36VDC;
5. Nominal pressure: 1.6 2.5 4.0 6.4MPa;
6. Environmental temperature: -30 ℃~60 ℃ (special: -40 ℃~80 ℃);
7. Medium temperature: ordinary type ≤ 100 ℃ (without heat sink);
High temperature type ≤ 400 ℃ (with heat sink);
8. Liquid receiving material: The measuring chamber is made of carbon steel or 1Cr18i9Ti; The rest is 1Cr18Ni9Ti;
9. Shell material: cast aluminum;
10. Flange standard: DIN2501 special type to be selected by the user;
11. Cable interface: M20 * 1.5 (internal thread);
12. Protection level: IP65;
13. Load characteristics: Maximum load resistance=50 * (power supply voltage -12)=600 Ω @ 24V;
14. Alarm output: collector open circuit form, maximum input current of 100mA, maximum switch voltage of 30VDC, with deviation band control;
15. Pulse output: with a minimum pulse width of 50ms, capable of dual channel output;
16. The maximum cumulative flow display value is 50000 units, automatically reset;
17. Damping time: adjustable from 1 to 100 seconds;
18. Explosion proof form, explosion-proof mark, explosion-proof certificate number.
6、 Installation instructions:
1. Normal temperature, low temperature, and high temperature flow meters are installed horizontally, vertically, or upside down depending on different working conditions (according to the factory calibration sheet);
2. When the working temperature of the medium is above+300 degrees, users should take insulation measures for the flowmeter housing to prevent thermal radiation damage to the meter head (the working temperature of the meter head is -30 to+70 degrees). Similarly, for media with a working temperature below -100 degrees, anti freezing measures should also be taken;
3. To ensure accurate measurement of the flowmeter, it is required to set up front and rear straight pipe sections;
4. To ensure that the flow meter does not affect the system operation during inspection and replacement, bypass valves (3) and shut-off valves (1, 2) should be installed as much as possible;
5. Vertical installation can be used due to process requirements, and the flow direction of the measured medium can be from bottom to top or from top to bottom, but it should be explained to the supplier when ordering;
6. The diameter of the flowmeter should be as similar as possible to the diameter of the connected pipeline to reduce flow interference and measurement errors;
7. The flowmeter housing must be reliably grounded, and if there is no grounding condition, it should be explained to the manufacturer.
7、 Normal working environmental conditions:
1. Atmospheric pressure: 86-106kPa;
2. Surrounding environmental temperature: -20 ℃ to+60 ℃ (8 ℉ to 140 ℉);
3. Relative humidity of the surrounding environment: ≤ 95% RH (+25 ℃);
4. Explosion proof flow meters can be applied to hazardous areas in Zone 1 and Zone 2 containing explosive gas mixtures of Class IIA, IIB, and IIC T1 to T4 groups;
5. Intrinsic safety flow meters are suitable for hazardous areas in Zone 0, Zone 1, and Zone 2 containing explosive gas mixtures of Class IIA, IIB, and IIC T1 to T4 groups.