Pressure Transmitter

The annular chamber (carrier rings) is proposed for orifice plates, for venturis and for nozzles. It has several advantages: it favors the circulation of the fluid over the complete circumference of the pipework and offers a more stable and precise averaged pressure; in the case of the orifice plate, it also allows to change only the plate in case of maintenance or change of process compared to a monoblock where the complete system must be changed. This type of mounting is particularly recommended for pipe diameters smaller than DN50.

For steam applications, condensate pots are essential. They are used to condense the fluid upstream of the differential pressure transmitter. Installed at the same height, they allow accurate measurement by maintaining a constant condensate height in the impulse lines above the differential pressure transmitter. The condensation pot can also be used to protect the transmitter in the case of a flow measurement of a corrosive / aggressive fluid. In this case we speak of separation pots. For more information, see the Frequently Asked Questions tab on this page.

The 1''/1'' flowmeter is also called a flowmeter with flange pressure taps. The high pressure upstream measurement is 1 inch from the upstream edge of the plate and, symmetrically, the low pressure measurement is 1 inch from the downstream edge of the plate. This is often a pre-assembled complete set with orifice plate mounted between orifice flanges. Orifice flanges are standardized and manufactured to ASME B16.36. The orifice plate is manufactured in accordance with ISO 5167 or ASME MFC-3M.

According to ISO 5167, flowmeters with orifice plates and nozzles (long radius) can benefit from D - D/2 mounting. This corresponds to a positioning of the upstream tap at a distance of 1D (D, internal diameter of the pipework) from the upstream of the orifice plate and the downstream tap at a distance of 1/2D from the downstream of the plate. This type of assembly has the advantage of not requiring orifice flanges (more expensive than standard flanges): you simply prepare bosses on the piping upstream and downstream of the measurement to position the pressure taps. It is widely used for large pipe diameters.