DN 25 eter tube with centric orifice plate
for institute testing air-conditioning in aviation
 

In 2003 company MATTECH launched flow meter with centric orifice plate designed for stated (trade) measurement of fluid flow (gases, fluids and steam) to the market which was produced in compliance with ISO 5167 and ISO TR 15377 standards. Construction of meter tube enables direct assembly of pressure differential reader for orifice plate tapings. These meter tubes are designed for measurement of low fluid flows in lower inner diameter tubes lower than DN 40. Working position of the flow meter can be either horizontal or vertical. Verified integrated orifice plates are supplied ex-works with document of its verification.

These meters have its own pattern approvals TCM 142/03-3851. Further demands are made on assembling organisations and users of meter tubes, since these are obliged to ensure especially essential direct lengths in front of and behind the orifice plate in compliance with requirements of ISO 5167 and ISO 15377 standards. We inform our customers about further requirements connected to assembly and operation of MATTECH meter tubes in exhibitions, trainings and seminars (see Services).

Integrated meter tubes established on the market with stated meters minimised discords in assembly of orifice plates and their further operation. Scope of production supplies is stated in particular pattern approval. Meter tube is a meter with valid pattern approval with permited error of measurement ranging from 0.55% to 0.75% according to type of measured medium. Working position of flow meter can be both vertical and horizontal. Division of meter tube to individual sections is due to keeping its oval shape and roughness of approach of pipe length placed in front of orifice plate. At the same time division enables easier control of meter tube during its maintenance and further verification of the meter. Meter tube is divided into three parts: inlet where medium is being steadied, meter part (orifice plate) and outlet. For the production of meter tubes we use as a standard material 11 grade steel. Meter tube can however be made of 15, 17 grade material as well as plastic. Plate is mass-made of 17 grade stainless steel. Plate is cautiously centred by locks – circular recesses on plate and shoulders on taping flanges.