14-20mA metal tube float flowmeterproduct overview
The use of high-quality MCU microprocessor system ensures the excellent performance of the flowmeter in various application scenarios. For many years, metal flow meters have been widely favored by industries such as petrochemicals, steel, power, metallurgy, and light industry due to their excellent performance and reliability, as well as their good cost-effectiveness. It is a commonly used flow measurement instrument in industrial automation process control. It has the characteristics of low pressure loss, large detection range (range ratio 10:1), and easy use. It can be used to measure the flow of liquids, gases, and steam, especially suitable for low flow rate and low flow medium flow measurement. Jiangsu's third-generation metal tube float flowmeter/rotor flowmeter

The LZ series metal float flowmeter has both local display and intelligent remote transmission types, with pointer display, instantaneous flow rate, cumulative flow rate, LCD display, upper and lower limit alarm output, cumulative pulse output, standard two-wire 4-20mA current output and other forms, providing users with a very wide selection space.

II4-20mA metal tube float flowmeterStructural principle

1. Structure
It mainly consists of three major parts
a、 Indicator (intelligent indicator, local indicator)
b、 float
c、 Cone shaped measuring room

2. Working principle
When the measured medium passes through the conical measuring tube from bottom to top, a differential pressure is generated at the upper and lower ends of the float, forming an upward force. When the upward force acting on the float is greater than the weight of the float immersed in the fluid, the float rises, and the annular gap area increases accordingly. The fluid flow velocity at the annular gap immediately decreases, and the differential pressure between the upper and lower ends of the float decreases. The upward force acting on the float also decreases until the upward force is equal to the weight of the float immersed in the fluid, and the float stabilizes at a certain height. The height of the float position corresponds to the flow rate of the measured medium. The float is equipped with magnetic steel, and when the float moves up and down with the medium, the magnetic field changes with the movement of the float.
a、 For the in-situ type, the rotating magnetic steel in the in-situ indicator is coupled with the magnetic steel inside the float, causing rotation and driving the pointer to indicate the current flow rate through the dial.
b、 For intelligent metal float flow meters, the change in magnetic field is converted into an electrical signal by a solid-state magnetic sensor in the indicator of the intelligent metal float flow meter. After A/D conversion, microprocessor, D/A output, and LCD display, the flow rate and cumulative flow rate are displayed.

IIImain features
1. Suitable for small diameters and low flow rates
2. Reliable work, minimal maintenance, and long lifespan
3. Low requirements for downstream straight pipe sections
4. Has a wide flow range of 10:1
5. Local pointer indication is close to linear
6. The intelligent metal float flowmeter indicator is equipped with an LCD liquid crystal display, which can display instantaneous and cumulative flow rates, as well as output pulses and alarms
7. Equipped with temperature compensation
8. There are various forms such as on-site type, remote transmission type, jacket type, explosion-proof, corrosion-resistant, etc

4Technical Parameter
1. Measurement range: Water 2.5-100000l/h (20 ℃)
2. Range ratio: 10:1
3. Accuracy level: 1.0, 1.5, 2.5
4. Work pressure: DN15, DN25, DN50 are PN4.0MPa, up to 10.0MPa, DN80, DN100 are PN1.6MPa, up to 6.4MPa
5. Medium temperature:- 40℃～300℃
6. Medium viscosity: DN15：η<5mPa·s（F15.1～F15.3）
η<30mPa·s（F15.4～F15.8）
DN25：η<250mPa·s
DN50～DN150：η<300mPa·s
7. Environmental temperature: LCD type:- 40℃～85℃
Pointer type:- 40℃～120℃
8. Connection form: flange (executed according to standard DIN2501 or manufactured according to the flange standard provided by the user)
9. Instrument height: 250mm
10. Cable interface: M20*1.5
11. Power supply: 24VDC two-wire system 4-20mA or 85-265VAC 50/60Hz (remote transmission type)
12. Alarm output: upper or lower limit instantaneous flow alarm relay output (large contact capacity) 5A@250VAC ）Or open collector output (large) 100mA@30VDC Internal impedance of 100 Ω
13. Pulse output: Accumulated pulse output, with small intervals of one pulse every 10 seconds (AC type) or one pulse every 50 milliseconds.
14. LCD display: dual row LCD display, displaying instantaneous flow and cumulative flow.
15. Intrinsic safety explosion-proof: Exia II CT4
16. Material of measuring tube: 316 stainless steel (ordinary type) or lined with polytetrafluoroethylene (anti-corrosion type)

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