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Shanghai Ziyi Automation Instrument Co., Ltd
Intelligent metal tube float flowmeter
NegotiableUpdate on 04/09
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Overview
Intelligent metal tube float flowmeter
Product Details
| ZY-LZ Intelligent Metal Tube Float Flow MeterDetailed information: |
| The ZY-LZ series metal rotor flowmeter has a simple structure, reliable operation, high accuracy, and wide applicability. Compared with glass rotor flow meters, it can withstand higher pressures. The LZ series flowmeter has various types such as local indication, electric remote transmission, limit switch alarm, corrosion resistance, jacket type, damping type, and explosion-proof. Widely used in the measurement and automatic control of liquid and gas flow in departments such as national defense, chemical industry, petroleum, metallurgy, power, environmental protection, medicine, and light industry. The flow meter detection parts are made of 1Cr18Ni9Ti stainless steel material, and in special occasions, they can also be composed of corrosion-resistant materials such as 0Cr18Ni12Mo2Ti or F46. Except for special specifications, the height of the flowmeter is 250 mm. The connecting flange adopts GB/T9119.8-10 standard, and can also be customized according to the user's special requirements. 2、 Principle structure When the fluid flows from bottom to top through an upright measuring tube, the float rises under the action of pressure difference, and the height of the float rise represents the size of the flow rate. And it is coupled and transmitted to the indicator through the magnetic steel in the float and the magnetic steel in the indicator, driving the pointer in the indicator to rotate. 
Figure 1 Instrument Structure Diagram
(1. Connecting flange; 2. Float guide plate; 3. Float; 4. Measuring body; 5. Tube body; 6. Float stop; 7. Spring clamp; 8. Indicator)
3、 Detailed parameters
1. Measurement range: water (2.5-6000) L/h;
Air (0.07-2000) m3/h (at 0.101025 MPa, 20 ℃).
2. Accuracy levels: 1.5 and 2.5.
3. Range ratio: 10:1.
4. Work pressure: DN15-50, 4 MPa; DN80～100，1.6MPa。
5. Medium temperature: -80 ℃~200 ℃ (F46 flowmeter with lining 0 ℃~80 ℃).
6. Viscosity of liquid medium: DN15 ＜ 5mPa · s; DN25～100＜5mPa·s。
7. Connection methods: flange connection, threaded connection, etc; The flange adopts the GB/T9119.8-10 standard.
8. Total length: DN15-100 250mm.
9. Material of measuring tube: ordinary type 1Cr18Ni9Ti, corrosion-resistant type 0Cr18Ni12Mo2Ti, 316L, 316 lined F46, etc. If the user has special requirements, special orders can be placed.
4、 Electrical performance
1. Output signal: two-wire system (4-20) mA, three wire system (0-10) mA.
2. Linearity: 1%;
3. Power supply: DC 24 (1 ± -15%) V.
4. Power consumption: 25 mW.
5. Environmental temperature: -25 ℃ to 55 ℃.
6. Temperature effect: 0.5%/10 ℃.
7. Load resistance: DC (0-10) mA (0-1) k Ω?; （4～20）mA （0～600）?。
8. Wiring cable: RVVP 3 × 28/0.15.
9. Explosion proof grade: Exib Ⅱ 2CT5 (certificate number GYB03582U).
10. Safety barrier model: LB906.
11. Electric remote transmission transmitter: K5WI-I type or ESK-I (two-wire system).;
12. Wiring diagram:
US - power supply voltage; RA - Load resistance.
Figure 2 Wiring diagram
5、 Limit switch alarm device
Limit switch alarm device can be installed for FZ type indicator
1. Technical parameters:
a) Power supply: AC 220 (1 ± 10%) V;
b) Power consumption: ≤ 3 W;
c) Working temperature: -25 ℃ to 60 ℃.
2. Wiring diagram:
Indicator controller
Figure 3 Wiring diagram
3. Setting of limit value: The position of the limit switch can be arbitrarily set by changing the position of the sensing head.
6、 Model specifications
1. Model
2. Selection
Table 1
3. Structural form
Note: The arrow indicates the flow direction of the medium
4. Flow range
The flow range is shown in Table 2
7、 Installation size
1. FZ
Figure 4 Installation dimensions
2. GB/T911.8～10
Table 3
Table 4
 Figure 5
8、 Usage and Maintenance
Before installing the flowmeter, it is necessary to clean the welding slag and debris inside the pipeline.
Figure 6 Installation diagram
2. The flowmeter must be installed perpendicular to the ground, and its inclination should not exceed 2 °. Otherwise, it will affect the measurement accuracy.
To ensure the measurement accuracy of the flowmeter, a straight pipe section of no less than 10DN should be added at the inlet end of the flowmeter, and a straight pipe section of no less than 5DN should be added at the outlet end. The regulating control valve must be installed downstream of the flowmeter during measurement.
If the measured medium is a large pulsating flow or two-phase flow, a buffer should be installed upstream of the flowmeter to eliminate or reduce pulsation, ensuring that the flow of the medium is single-phase stable. At the same time, it is recommended to use a damping type flowmeter.
If the measured medium is dirty or contains magnetic particles, a filter or magnetic filter should be installed upstream of the flowmeter.
6. The installation of the flow meter should be able to appropriately support the vibration of the pipeline or reduce the axial load of the flow meter, otherwise additional support for the fixed flow meter should be added.
For the convenience of maintenance and repair of flow meters, cleaning of magnetic filters, and regular maintenance of user pipelines, it is recommended to use bypass pipelines as shown in the figure.
When the flowmeter is used for gas measurement, it should be ensured that the working pressure inside the pipeline is not less than 5 times the pressure loss of the flowmeter, so that the flowmeter can operate stably and normally.
Before using the electric remote transmission and flow meter with alarm limit switch, open the instrument cover and connect the wires correctly according to the wiring diagram. For alarm type limit switches, users can set the limit alarm position as needed, tighten the screw, and use it after restoration.
10. Press the warning sign on the instrument indicator, remove the blocking component that prevents float vibration during transportation, and restore it before using the instrument.
11. If the flowmeter is turned on, due to the lack of pressure in the pipeline or the system not reaching the working pressure for normal use of the instrument, the control valve must be slowly opened until the system is normal before the instrument can be used. Otherwise, it is easy to cause pointer jumping or sudden impact of the float and damage.
When using, if the density of the measured fluid is different from that of water, or the parameters and working conditions of the measured gas are different from those specified by the manufacturer, the reading of the flowmeter should be converted. The conversion method is shown in the appendix.
9、 Maintenance of common faults in instruments
Common faults and troubleshooting methods are shown in Table 5:
Table 5
10、 Precautions for using explosion-proof products
The FZD series metal tube float flowmeter has been inspected by the National Instrumentation Explosion proof Safety Supervision Station (NEPSI) and meets the requirements of GB3836.1 and GB3836.4 standards. The explosion-proof mark of the product is iblCT5, and the explosion-proof certificate number is GYB03582U. Users should pay attention to the following matters when using the product.
1. The casing of the metal tube float flowmeter does not have a grounding terminal, and users should reliably ground it during use.
The maximum operating ambient temperature for the metal tube float flowmeter is -25 ℃ to 55 ℃.
3. The FZD series metal tube float flowmeter must be used in conjunction with the LB906 Zener safety barrier to form an intrinsically safe explosion-proof system. The system wiring is shown in Figure 6.
Figure 7
4. The wiring of this security system should avoid the influence of external electromagnetic interference as much as possible, and the cable distribution parameters should be controlled within 0.08 μ F and 2 mH.
5. Safety barriers must be installed in safe places. The installation, use, and maintenance of safety barriers should comply with the user manual.
The maximum operating voltage of the control room instruments connected to the safety barrier or the maximum voltage that may be generated internally shall not exceed 250Vrms.
7. Users must carefully read the product manual and comply with the "Electrical Safety Regulations for Explosive Hazardous Areas of the People's Republic of China" when installing, using, and maintaining the LZD series metal tube float flowmeter.
11、 Design selection and ordering instructions
1. According to whether the measured fluid is a gas or a liquid. Correctly select gas or liquid metal tube float flowmeter.
2. If the tested fluid is non corrosive, choose the ordinary type, and if it is corrosive, choose the anti-corrosion type.
3. Please indicate the name, flow rate, pipe diameter, working pressure, temperature, density, viscosity, and other information of the tested medium when placing an order. Our company can adjust the scale according to the density and other requirements provided by the user, and produce special flow scales.
5. Select appropriate specifications and varieties based on the measurement range and application scenarios of the fluid being tested. If there are special requirements for flow meters, please contact the company or contact the marketing department by letter.
appendix
When a flowmeter is used to measure liquid flow rate, the manufacturer uses clean water at room temperature as the calibration fluid scale for calibration,
If the density of the measured fluid is different from that of water, the flow reading should be converted. The conversion formula is as follows:
In the formula:
Q1- Flow rate under working conditions;
Q0- Flow rate corresponding to the indicated flow rate or output signal of the flowmeter;
ρ f - average density of the float;
ρ 1- Density of the tested liquid in working condition;
The density of water at ρ 0-20 ℃ is 998.2kg/m ³.
When the flowmeter is used for gas flow, the manufacturer uses dry air at standard conditions (20 ℃, 101.325kPa) as the gas standard
Divided by a ruler. If the working state of the measured gas is different from the manufacturer's specifications, the reading of the flowmeter should be converted using the following formula:
In the formula:
Q1- Convert the gas flow rate under working conditions to the flow rate under standard conditions;
Q0- Flow meter reading flow rate;
ρ 1- Density of the measured dry gas in working condition
ρ - density of dry air under standard conditions, （1.205kg/m3）；
P1- The pressure of the dry gas being measured under working conditions (i.e. the sum of gauge pressure and atmospheric pressure) in kPa;
P0- pressure at standard state, P0=101.325 kPa;
T1- thermodynamic temperature of the measured dry gas in working condition, K;
T0- thermodynamic temperature at standard state; T0 =293.15 K。
3. Due to the different working conditions of users, please indicate the name, flow rate, and diameter of the measured medium, as well as the pressure, temperature, density, and viscosity of the medium, so that we can help users select the correct one. According to user requirements, it can also be made into a working state or a flow scale converted from gas in working state to standard state.
4. Generally, the measured flow rate can be selected as ordinary type, and for corrosive fluids, corrosion-resistant type (lined with fluoroplastic) can be used. Product Selection
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