Is the orifice plate flowmeter mounting form only flange type?

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The structure of the orifice flowmeter sensor part looks very simple, with only two flanges connected. Then connect to the pipe through bolts, etc. So basically all orifice plate connections are flange connections.

But there are many different flange forms and standards. For example, flange standards include national standard GB, chemical industry standard HG, American standard ASME, former mechanical ministry standard JB, German standard DIN, etc., and their calibers are specific. The size, flange hole size, and number of holes are all different. There are also flange forms: there are butt welding flanges, neck flanges, socket flanges, etc., and their structures are different.

The connection method of the orifice flowmeter is basically a flange connection, but because the flanges are different, it is necessary to specifically determine what standard and form it is during installation.