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Pressure transmitter installation issues?

It is best not to install the pressure transmitter at the bend; the pressure transmitter should preferably be installed vertically, as most manufacturers calibrate it vertically.

How is the pressure accuracy grade defined?

Every type of electronic measuring instrument has accuracy errors, but the accuracy levels marked by different countries vary. For example, countries like China and the United States mark accuracy based on the best linearity part of the sensor, which is usually between 10% and 90% of the measurement range; whereas Europe marks accuracy based on the worst linearity part, which is usually between 0% to 10% and 90% to 100% of the measurement range. For instance, if Europe's marked accuracy is 1%, then China's marked accuracy would be 0.5%.

What are the types of pressure output signals?

The signal outputs mainly include 4~20mA, 0~20mA, 0~10V, 0~5V, etc., but the more commonly used ones are 4~20mA and 0~10V. Among these output signals, only the 4~20mA is two-wire (the commonly referred number of wires for output does not include ground or shield wires), while the others are all three-wire.

What are the main types of threads for pressure transmitters?

Pressure threads include British Standard Pipe threads (G1/2, G1/4, etc.), metric threads (M20*1.5, M14*1.5), and American National Tapered Pipe threads (NPT threads).

The working principle of Coriolis flowmeters

🎯 Core Principle: The Coriolis Effect

To understand it, you must first grasp a physical phenomenon— Coriolis Effect A common example is:
Imagine a rotating disk (like a record player)—you try to draw a straight line outward from the center. Because the disk is spinning, the line you draw will appear curved on the surface of the disk. Curved curve This "deflection" force, which arises from motion within a rotating system, is known as the Coriolis force.

How is it applied in flow meters?

A Coriolis flowmeter contains one or two pipes. U-shaped, Ω-shaped, or straight measurement tubes Its workflow can be broken down into the following steps:

Drive vibration
Electromagnetic actuators enable this measuring tube to move in its Intrinsic resonant frequency Perform continuous, high-frequency micro-vibrations (much like a tuning fork). When no fluid flows through, the tube’s up-and-down oscillations are symmetrical.

Fluid inflow and "opposition"
When the fluid begins to flow through the measuring tube, it is actually moving in a Motion in a vibrating coordinate system This will create the Coriolis effect.

Tubular Distortion (Key Step)

When the fluid flows toward the vibrating tube Entrance side At that moment, fluid molecules will "resist" the tendency to be flung upward, generating a The downward force , trying to "pull" the pipe down.

When the fluid flows toward the vibrating tube Export Side At that moment, the situation is reversed—fluid molecules "resist" the tendency to be flung downward, creating a The upward force , trying to "push" the pipe upward.

The combined effect of these two forces acting in opposite directions is to cause The measuring tube becomes twisted. 。

Detection and Calculation
Measuring tubes have fittings installed at both ends. Magnetic sensor , they can precisely detect this distortion. Specifically, they identify the vibrations at both ends passing through the central point. Time difference (phase difference) 。

No traffic At that moment, the time difference is zero.

The greater the traffic The stronger the Coriolis effect, the more pronounced the distortion of the measuring tube—and the greater the time difference detected by the sensor. The bigger it gets 。

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