Series M21
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Metal tube flowmeters Series M21 Variable area flowmeter for low flows of liquids, gases and steam          Metallic tube with a robust construction Indication by means of magnetic coupling Scales calibrated in l/h, m3/h, kg/h, t/h, %, etc. High performance measurement in extreme working conditions and high resistance to corrosion Low pressure drop Regulating valve optional Vertical or horizontal connections Damping mechanism to avoid float bounces in gas and steam applications Flow rate: - Water: 0.4 l/h ... 1000 l/h - Air: 12 Nl/h ... 30 Nm3/h Accuracy: 4% (qG=50%) Connections: - ¼” ... ¾” BSP / NPT - Sanitary connections according to ISO 2852, SMS 1145, DIN 11851, TRI-CLAMP® Materials: EN 1.4404 (AISI 316L) Local indication Options: - 1 or 2 limit switches - Electronic transmitter with 4-20 mA output for safe or hazardous area (Ex ia IIC T4...T6 Ga / Ex ia IIIC T85ºC Da protection, ATEX certified). HART prot

Working principle The M21 flowmeter is a metal tube variable area flowmeter for low flows. It is based in the principle of variable area, which is obtained by a float that moves up and down inside a calibrated orifice. The force from the fluid, as it flows from the bottom to the top, displaces the float until it reaches an equilibrium point that is a function of: - E = force of the fluid flow - Pf = weight of the float - Al = free area of flow (Al = Ao, calibrated orifice area, - Af, float area) Each float position corresponds to a flow rate value. The float magnetic field moves the needle...

Flow ranges Model N° Other flow ranges on request

Limit switches and transmitters Adjustable limit switch M1-AMD NAMUR (EN 60947-5-6) 3.5 mm slot type inductive detector activated by vane, mounted in the indicator housing. • M1-AMD1 ... 2: 1 ... 2 adjustable limit switches • Power supply: 8 VDC • Ambient temperature: -25°C ... +70°C • ATEX certification Ex ia IIC T4...T6 Ga / Ex ia IIIC T85°C Da Control relay (on request) NAMUR (EN 60947-5-6) for 1 or 2 inductive detectors. • Power supply: 24 ... 253 VAC 50-60 Hz 24 ... 300 VDC • Input: NAMUR Ex ia IIC • Output: 1 or 2 relay contacts • Output rating: 2 A 250 VAC 100 VA / 1 A 24 VDC •...

Available for W” ... %”. Components: - Upper float stop - Float - Piston - Piston locking circlip - Guide cylinder Float damping system (for gas and steam applications) Ceramic, PEEK or metallic piston system for avoiding float oscillations in flowmeters for gas and steam service, obtaining stable readings even with very low working pressures and low gas densities. Damping system for M21 te” y %” BSP system Total length M21 with damping system NPT: NPT system Constant flow regulators RCA / RCD The M21 flowmeters are designed to incorporate the RCA and RCD constant flow regulators, which can...

PRESENCE IN MORE THAN 50 COUNTRIES ALL OVER THE WORLD The art of measuring R-CT-M21 Rev. 2 english version Quality Management System ISO 9001 certified by pplus Pressure Equipment Directive 97/23/CE certified by Keg)sTer ATEX European Directive 94/9/CE certified by HART® is a registered trademark of HART Communication Foundation The technical data described in this specification sheet is subject to modification without notification if the technical innovations in the manufacturing processes so require. TRI-CLAMP® is a registered trademark of Alfa Laval Inc.