ATCF Coriolis mass flowmeter from China Manufacturer - Aister Instrument (Shanghai) Co., Ltd

Introduction Features Specifications Model Selection Application Installation

Introduction

Mass Flowmeter is designed according to the principle of Coriolis force. Under the alternating current effect, the magnet and coil installed on the measuring tube will make two parallel measuring tubes vibrate according to some fixed frequency. Once there is flow passing through the pipes, Coriolis force will give rise to deflection (phase shift) on the vibration of two pipes and the deflection of vibration is directly proportional to the mass flow of fluid. Pick up them and the mass flowrate could be calculated. The vibration frequency of measuring tube is determined by the total mass of measuring tube and inner fluid. When the fluid density changes, the vibration frequency of measuring tube will be also changing, as a result, the fluid density can be calculated. The temperature sensor installed in the pipeline can pick up the fluid temperature on time under the coordination of measuring circuit.

Features

Enable to measure directly mass flow rate of fluid in the pipeline without changing any parameters, which avoids the some measurement error of intermediate links. Its mass flowrate can be high accuracy and good repeatability within bigger range of turndown ratio.

Fluid measured can be more extensive, such as the steady uniform flow of common viscosity fluid, the high viscosity fluid, non-Newtonian fluid, slurry containing some solid components and the liquid containing some trace of gas.

Due to the small vibration, measuring tube of the Mass Flowmeter can be regards as non-moving parts, which will reduce the maintenance of flowmeter, enhance the stability and lifetime.

Besides the mass flow measurement, the density and temperature and even consistency can also be picked up and output.

Specifications

Performance	Technical parameter
DN(mm)	8 ~ 250
Medium	Liquid, gas, slurry
Type / Medium Temp.	Integrate type: ( -50 ~ 125) ℃ Remote type: ( -50 ~ 200) ℃ Remote type with high temp.: ( -50 ~ 300) ℃ Remote type with low temp.: ( -150 ~ 125) ℃
Sensor	Triangle type, U-type, Micro-bend type
Transmitter	DSP
Certification	Ex-proof
Power Supply	DC24V、AC220V
Output Port	RS485
Pressure (MPa)	1.6、2.5、4.0、6.3; Customized for high pressure: 10.0, 16.0, 26.0
Output Signal	4~20mA, pulse
Accuracy	0.1%, 0.15%, 0.2%, 0.5%
Hygienic Type	Customized
Process Connection	Customized

Model Selection

01 Safety of media:
The corrosiveness of the medium, whether the medium has a chemical reaction with the liquid surface material of the flow meter, and whether the instrument housing has a certain corrosion resistance to the application site.

02 Pipeline pressure:
The pressure level of the sensor should meet or be higher than the pressure level of the process pipeline design, and the sensor should not be used in the overpressure range.

03 Temperature of the medium:
When selecting the instrument, attention should be paid to the applicable temperature of the instrument, and the temperature resistance of the detection element in the sensor is certain, so as to avoid the normal use of the instrument caused by the damage of the detection device.

04 protection requirements:
Consider whether the protection level of the instrument housing meets the requirements for use when using the instrument outdoors and in special occasions.

05 explosion-proof requirements:
The explosion-proof level of the instrument should meet the safety standards of the use site, distinguish the safety side and the dangerous side of the explosion-proof site, and reasonably select the required explosion-proof type of sensors and transmitters.

06 Flow range:
First of all, the measuring range of the flowmeter should cover the flow range of the measured medium; Secondly, the measurement accuracy of the mass flow meter contains zero instability, which affects the accuracy of the measurement at the lower limit (small flow rate), so the flow range of the measured medium is best selected in the best flow range of the flow meter (20%-85% of the maximum flow rate of the flow meter).

07 other relevant factors: including instrument installation, maintenance, power and pressure loss and other factors.

Application

Industrial process

Energy measurement

Environmental protection engineering

Transportation

Biotechnology

Scientific experiment

Marine meteorology

Rivers and lakes

Installation

1. The sensor should be placed away from interference source which may cause pipe’s mechanical vibration such as the pump along the process pipeline. If sensors are used in series along the same line, care must be taken to guard against the mutual influence due to resonance. The distance between sensors should be at least more than three times its width.

2. When installing the sensor, pay attention to the expansion and contraction of the process pipeline due to temperature change. It is strongly recommended that the sensor should not be installed near the expansion joint of the process pipeline. Otherwise, the pipe expansion and contraction of the pipeline will bring about transverse stress which can affect the sensor‘s zero, as a result of which the measurement accuracy will be affected.

3. The sensor should be placed away from industrial electromagnetic interference sources such as large power motors and transformers, otherwise, the measuring tube’s auto-oscillation within the sensor will be interfered, and the weak signal detected by the speed sensor may be drowned by the electromagnetic noise. Therefore, the sensor should be away from such sources as motors and transformers, at least five meters.

4. The sensor should be placed in the position where its measuring tube is always filled with fluids and a certain pressure out is maintained, thus it should be placed in the lower end of the pipeline.

5. Basic requirement: Install the Mass Flowmeter in the lower position of the pipeline so that the fluid can fill with the sensor during the process of zero point calibration and running. The transmitter should be installed in the environment with temperature from -40～+55℃ and humidity <90%.

6. Dangerous area: Please confirm the installation environment is suitable to the explosion-proof performance indicated in the nameplate of Mass Flowmeter for the installation of dangerous area.

7. Straight pipe: Mass Flowmeter does not require the special straight pipe upstream or downstream. However, if tow or more mass flow sensors are installed serially in the same pipeline, please ensure the length of pipe between any two sets is more than 2 meters.

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