The clamp type liquid turbine flowmeter is a new generation of turbine flowmeter with the characteristics of simple structure, lightweight, high accuracy, good reproducibility, sensitive response, and easy installation, maintenance, and use. It is widely used for measuring closed pipelines and does not corrode stainless steel 1Cr18Ni9Ti, 2Cr13, corundum Al2O3, hard alloys, and has no impurities such as fibers or particles.

The clamp type liquid turbine flowmeter is a quick installation (clamp type) with simple installation (disassembly), easy maintenance, and convenient cleaning. The instrument housing is made of stainless steel (316L), and the movement part is made of special materials, which have good anti-corrosion and rust prevention capabilities. The whole meter structure breaks through traditional craftsmanship, greatly improving the accuracy and repeatability of the instrument. Specially designed for the pharmaceutical and beverage industries, using a quick connect structure for easy cleaning.

There are roughly four types of instruments for clamp type turbine flow meters, which meet different practical applications and engineering needs:

1. Real time display type, this flowmeter adopts a new advanced single-chip microcomputer technology, which can instantly display the instantaneous flow rate and total amount of liquid in instrument measurement.
2. Pulse output type, mainly equipped with turbine flow sensors and amplifiers on instruments, with three external wires for measurement.
3. 4-20mA output type, connect the 4mA circuit to the turbine flow sensor for zero flow, and connect the 20mA circuit to the flow sensor for high flow, so that the sensor can emit flow signals externally.
4. Split remote transmission display type, this flowmeter can be connected to a computer, providing flow upper and lower limit alarms, batch and timed quantitative control.

Clamp type liquid turbine flowmeter product features:

1. The clamp type turbine flowmeter has high precision, generally up to ± 1% R and ± 0.5% R, and the high-precision type can reach ± 0.2% R;
2. Good repeatability, short-term repeatability can reach 0.05%~0.2%, precisely because of its good repeatability, such as frequent calibration or online calibration can achieve higher accuracy, it is commonly used in trade settlement flow meters;
3. The clamp type turbine flowmeter outputs pulse frequency signals, suitable for total measurement and connection with computers, with no zero drift and strong anti-interference ability;
4. The clamp type turbine flowmeter can obtain frequency signals (3-4kHz) with strong signal resolution;
5. The clamp type turbine flowmeter has a wide range, with a medium to large diameter of up to 1:20 and a small diameter of 1:10;
6. The clamp type turbine flowmeter has a compact and lightweight structure, easy installation and maintenance, and high flow capacity;
7. The clamp type turbine flowmeter is suitable for high-pressure measurement, and there is no need to open holes on the instrument body, making it easy to make high-pressure instruments;
8. There are various types of specialized sensors for clamp type turbine flow meters, which can be designed according to the special needs of users, such as low-temperature type, bidirectional type, downhole type, sand mixing type, etc.

Technical parameters of clamp type liquid turbine flowmeter:

property	Technical parameter
Gauge aperture	4、6、10、15、20、25、32、40 、50（mm）
accuracy level	±1%R、±0.5%R、±0.2%R（Require special order）
Range ratio	1:10；1:15；1:20
Instrument material	316（L）Stainless steel
Temperature of the measured medium	-20～＋120℃
Environmental condition	Temperature -10 ~ +55℃, relative humidity 5% ~ 90%, atmospheric pressure 86 ~ 106Kpa
Output signal	Sensor: pulse frequency signal, low level ≤0.8V high level ≥8V; Transmitter: two-wire system 4 ~ 20mADC current signal;
Power supply	Sensor: +12VDC, +24VDC (optional); Transmitter: +24VDC;
Field display type	The meter comes with a 3.2V lithium battery
Signal transmission line	STVPV3×0.3 (three-wire system), 2×0.3 (two-wire system)
Transmission distance	≤1000m
Signal line interface	Basic model: Hausmann connector or three-core cable; Explosion-proof type: internal thread M20×1.5
Explosion-proof class	Basic type: non-explosion-proof products; Explosion-proof type: ExdIIBT6
Class of protection	IP65

Selection of liquid turbine flowmeter:

1. According to the requirements of the measurement purpose: it is required to choose whether to include instantaneous flow or cumulative flow (cumulative flow), the unit of flow display, measurement accuracy, repeatability, linearity, flow range and range degree, measurement temperature, pressure loss, temperature pressure compensation, output signal characteristics and response time, etc. Different measurement objects have their own measurement purposes, and there are different focuses on the performance of liquid turbine flow meters.
2. The requirements for measuring the phase composition of the medium: caution should be exercised when measuring whether the medium is a single phase change medium or when measuring multiphase and multi-component flow. Liquid turbine flowmeter measures a single clean medium.
3. Requirements for measuring medium properties: chemical corrosion and scaling, and the chemical properties of fluids sometimes become the determining factors for selecting measurement methods and instruments. Some fluids can cause corrosion of instrument contact parts, surface scaling or precipitation of crystalline metal surfaces, resulting in electrochemical reactions.
4. Compression system and other parameter requirements: Measuring gas requires knowing the compression coefficient value in order to obtain the fluid density under working conditions. Calculate the density of a fluid with a fixed composition through pressure, temperature, and compression coefficient; For fluids with compositional changes and working near (or in) the supercritical region, online density measurement should be considered.
5. Measurement accuracy requirements: It is necessary to clarify the overall measurement accuracy requirements and whether it is used at a specific flow rate or within a certain range due to significant changes in temperature and pressure. The values are generally low and the differences between various gases are small. The commonly used accuracy levels for intelligent liquid turbine flow meters are grade and grade. This accuracy level is higher than that of general rotor flow meters and is a good choice for customers with high accuracy requirements.

Precautions for installation of liquid turbine flowmeter:

1. The instrument installation adopts flange connection, threaded connection and clamping type;
2. During installation, the direction of liquid flow should be consistent with the direction indicated by the arrow on the sensor housing, and the upstream straight pipe section should be ≥ 20dn, and the downstream straight pipe section should be ≥ 5dn (dn is the inner diameter of the pipeline).
3. Sensors should be kept away from external magnetic fields. If unavoidable, necessary measures should be taken;
4. In order to avoid affecting the normal transportation of liquids during maintenance, bypass pipes should be installed outside the straight pipe sections at both ends of the sensor;

When installing sensors outdoors, please ensure that the amplifier plug is waterproofed;

6. The wiring between sensors and display instruments should be selected according to the power supply of the amplifier. Please refer to the relevant “User Manual” for details.