Precautions for Flow Meters

Release time：

2023-01-12 17:09

Source：

Flow meters are mainly used in chemical production. The general selection is mainly based on the following principles:

(1) 316 stainless steel is used for the selected area of the flowmeter body to prevent corrosion. If it is an explosion-proof area, it must also be an explosion-proof result.

(2) Bearings generally have three specifications: tungsten carbide, polytetrafluoroethylene, and carbon graphite: tungsten carbide has high precision, and it is used as a standard part for industrial control; polytetrafluoroethylene, carbon graphite can be anti-corrosion, and it is generally preferred in chemical plants . The life of the bearing is proportional to the square of the flow velocity, so the best flow velocity is 1/3 of the flow velocity.

(3) The induction probe detects the movement of the rotating body and converts it into a pulsed digital electrical signal. Its electromagnetic coil voltage output value is close to a sinusoidal curve, and the frequency range of the pulse signal changes linearly with the measured flow rate. The typical range is 10 :1, 25:1 and 100:1 three specifications. The resistance of the electromagnetic coil is generally less than 2000Ω, and it may be damaged if it is greater than this value.

Precautions for installation of flowmeter

(1) The power cord of the transmitter adopts metal shielding wire, and the grounding should be good and reliable. The power supply is DC 24V, 650Ω impedance.

(2) The transmitter should be installed horizontally, avoid vertical installation, and ensure that there are suitable straight pipe sections before and after it, generally 10D in front and 5D in back.

(3) Ensure that the flow direction of the fluid is consistent with the direction of the arrow on the instrument case, and it must not be reversed.

(4) The measured medium must not corrode the turbine, especially the bearing, otherwise measures should be taken.

(5) Be careful not to collide with the magnetic induction part.

flow meter,Precautions

What are the principles of flow measurement

Electromagnetic flowmeter technology development history

What are the principles of flow measurement

Electromagnetic flowmeter technology development history

2021-09-15

Flow measurement is the measurement of common fluid physical indicators in production and life. There are many principles of flow measurement, including ultrasonic, electromagnetic, pressure, temperature and other measurement principles.

Precautions for Flow Meters

2021-09-15

Flow meters are mainly used in chemical production. The general selection is mainly based on the following principles:

Electromagnetic flowmeter technology development history

2021-09-15

From the AC sine wave power frequency excitation developed in the 1950s to the low-frequency rectangular wave excitation in the 1970s and 1980s, and then to the high-frequency excitation, dual-frequency excitation, and programmable control excitation after the 1990s, the excitation methods are constantly changing.

Maintenance and repair skills of industrial instruments

2021-09-15

As long as proper maintenance steps are taken, scientific maintenance methods are followed, the technical performance of the instrument is understood, the working principle of the circuit is well studied, the basic measurement methods are familiar, and the fault inspection skills are mastered, it is not difficult to find out its regularity.

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