1. Product overview:

LZ series metal tube rotor flowmeter is a variable area flowmeter based on float position measurement. It adopts all-metal structure and Modular concept design. Because of its small size, small pressure loss, large turndown ratio (10:1), and convenient installation and maintenance, it is widely used in complex and harsh environments in various industries. Flow measurement and process control for low flow rates and various harsh media conditions.

The series products of metal tube flowmeters have a variety of measurement forms for users to choose according to different user needs and different occasions; according to the output form, there are local indication type, remote transmission type, and control alarm type; according to explosion-proof requirements , and can be divided into three types: ordinary type, intrinsically safe type, and isolated explosion-proof type.

It adopts a magnetic sensor for non-contact detection of magnetic field angle changes, and is equipped with a Motorola microprocessor system, which can realize functions such as liquid crystal indication, accumulation, remote transmission (4-20mA), pulse output, and upper and lower limit alarm output. The signal transmitter has high precision and reliability, can completely replace imported instruments of the same type, and has the characteristics of high cost performance, multi-parameter calibration, and power failure protection.

The design and manufacture of the metal tube flowmeter also considers the user's process flow direction requirements, including vertical installation, top-in and bottom-out installation, side-in and side-out installation, bottom-in and side-out installation, threaded connection, horizontal installation and other installation methods Optional.

2. Working principle:

LZ series metal tube rotameter is the force that the upper and lower ends of the float generate differential pressure when the measured medium passes through the conical measuring tube from bottom to top. When the lifting force on the float is greater than the weight of the float immersed in the fluid, the float will rise. , the area of the annulus increases accordingly, the fluid velocity at the annulus decreases immediately, the differential pressure between the upper and lower ends of the float decreases, and the lifting force acting on the float also decreases, until the lifting force is equal to the weight of the float immersed in the fluid, the float will stable at a certain height. The height of the float position corresponds to the flow rate of the measured medium. The float has a built-in magnetic steel. When the float moves up and down with the medium, the magnetic field changes with the movement of the float.

a. For the local type, the rotating magnet in the local indicator is coupled with the magnetic steel in the float to rotate, and at the same time drive the pointer to indicate the flow rate at this time through the dial.

b. For the intelligent type, a solid-state magnetic sensor in the intelligent indicator converts the change of the magnetic field into an electrical signal, and displays the flow rate through A/D conversion, microprocessor, D/A output, and LCD liquid crystal display. size and cumulative flow.

3. Flowmeter type:

According to the direction of fluid inlet and outlet, the products are divided into 5 types: vertical type, horizontal type (also divided into horizontal T type, horizontal spring type), bottom-in side-out type, side-in side-out type, side-in and top-out type, and Each type has standard type, high temperature type, jacket type and so on.

When the diameter of the horizontal installation type flowmeter is smaller than DN50 (inclusive), the T-type structure is selected, and when it is larger than DN50, the spring structure is selected.

Flowmeter connection specifications: The standard type of LZ series metal tube flowmeter adopts GB/T9119-2000 flange standard, and the flange standard can be made according to customer needs; threaded connection and clamp connection can also be selected.

Magnetic filter:

If the medium contains ferromagnetic particles, a magnetic filter should be installed in front of the flow meter inlet.

4. Application occasions:

LZ series metal tube rotor flowmeter is a kind of variable area flow measuring instrument commonly used in industrial automation process control. It has the characteristics of small size, large detection range and convenient use. It can be used to measure the flow of liquid, gas and steam, especially suitable for medium flow measurement with low flow rate and small flow. It is widely used in complex and harsh environmental conditions, such as petroleum, chemical industry, power generation, pharmaceutical, food, water treatment, etc., and in the flow measurement process of various medium conditions.

Five, the main features:

1. All-metal structure design, strong, concise, high pressure resistance, high temperature resistance, anti-corrosion, long service life;

2. Short stroke, total height 250mm, easy installation;

3. The mechanical pointer indicates the instantaneous flow on site, and the LCD liquid crystal displays the instantaneous flow and cumulative flow;

4. Intelligent indicator, using foreign signal acquisition and processing chip, modular design, no magnetic lag;

5. With data recovery, data backup, power failure protection and error self-diagnosis functions;

6. HART type indicator, two-wire 24VDC power supply, 4-20mA standard current signal output superimposed HART protocol;

7. Parameter configuration and on-site adjustment can be performed through the HART communication hand-held communicator;

8. Connect with the serial port of the PC, and realize the on-site calibration of the instrument through the Windows program;

9. Can be used in flammable and explosive hazardous situations;

10. Various installation forms such as vertical, horizontal, top in and bottom out, bottom in and side out, side in and side out, etc., flange or threaded connection.

6. Technical parameters:

1. Measuring range: water 2.5～100000l/h (20℃);

2. Turndown ratio: 10:1;

3. Accuracy class: 1.0, 1.5, 2.5

4. Working pressure: DN15, DN25, DN50 is PN4.0MPa, the maximum is 10.0MPa, DN80, DN100 is PN1.6MPa, the maximum is 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. Ambient temperature: liquid crystal type: -40℃～85℃; pointer type: -40℃～120℃;

8. Connection form: flange (implementing standard DIN2501 or manufacturing according to user-provided flange standards)

9. Meter 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 (maximum contact capacity 5A-250VAC) or open collector output (maximum 100mA-30VDC internal impedance 100Ω).

13. Pulse output: cumulative pulse output, one pulse every 10 seconds (AC type) or one pulse every 50 milliseconds at the smallest interval.

14. Liquid crystal display: double-row liquid crystal display, showing instantaneous flow and cumulative flow.

15. Intrinsically safe explosion-proof: Exia II CT4.

16. Material of measuring tube: 316 stainless steel (common type) or lined with PTFE (anti-corrosion type).