DM-FV40 Vortex Flow Meter for Steam and Gas, DN15-DN300

Overview

The DM-FV40 measures steam and gas flow using the von Kármán vortex principle: a bluff body in the flow sheds vortices at a frequency proportional to velocity, and a piezoelectric sensor downstream counts them. There are no moving parts in the flow, so the meter does not wear and does not need a strainer or a bypass.

With the optional integrated PT100, the meter calculates compensated mass flow for saturated steam directly, so the control system receives a mass flow value instead of volumetric flow that has to be corrected elsewhere. The display shows flow, total, temperature and pressure on two lines.

Key features

• DN15 to DN300, PN16 to PN40 flange connections
• ±1% of reading for liquids, ±1.5% for gases and steam
• No moving parts, no strainer required
• Integrated temperature compensation for saturated steam (option)
• 4-20 mA with HART 7, pulse and RS485 Modbus
• Up to 400 °C media temperature with the high-temperature head

Typical applications

• Steam header and branch metering
• Compressed air consumption by production area
• Natural gas and process gas flow
• Boiler feedwater and condensate measurement

Sizing note

Vortex meters have a minimum Reynolds number, so an oversized meter will not register low flow. Size for the normal flow at 60-80% of range and confirm that the minimum flow stays above the meter’s lower limit; if it does not, choose a smaller size or a different technology.