Spring-loaded stainless steel variable area flow meter for horizontal installation

All-metal rotameter intended for horizontal pipework, thanks to a float working against a spring. It measures liquid flows up to 60,000 l/h of water and gas flows up to 1100 Nm³/h of air. The body is 1.4404 stainless steel, with an optional PTFE lining. The instrument carries ATEX, IECEx, NEPSI and CCOE/PESO approvals.

Features

• Suitable for horizontal installation
• Ranges from 10…100 l/h up to 6000…60,000 l/h of water
• Ranges from 0.3…3 Nm³/h up to 110…1100 Nm³/h of air
• DN15…DN100 or ANSI ¾"…4" flanges
• Pressure rating PN40 (PN16), up to 600 bar on request
• Maximum temperature +200 °C, -40…+350 °C on request
• Accuracy ±2 % of full scale
• Options: contacts, analogue output, totaliser, HART®

Operating principle

A guided float moves inside the metering tube, pushed by the medium and held back by a spring acting in the opposite direction. When there is flow, an annular gap opens between the conical magnet carrier and the metering ring; the position of the carrier results from the balance between the flow force, the spring force and, in vertical installations, buoyancy and weight. Each position corresponds to a flow value determined during calibration and printed on the scale. A magnetic coupling transfers the movement to a second encapsulated magnet on the pointer shaft, which shows the reading on the scale.