Technical Specifications Overview
The document provides detailed technical specifications for the FM series flowmeters, specifically models FM 2200, FM 2300, FM 2500, FM 2800, and FM 2900. All models, except FM 2900, share the same dimensions (148x143x318 mm) and vary slightly in weight, with FM 2900 being the heaviest at 7.2 Kg.

Dosage Range and Accuracy
The flowmeters are designed to handle various gases including O2, N2O, Air, and CO2, with specific dosage ranges for each. The accuracy of the flowmeters is ±10% of the read value or ±0.3 L/min, whichever is greater. For flows less than 1 L/min, the accuracy is ±10% E.O.S.

Pressure and Safety Features
The inlet pressures range from 3.5 to 5 bar with a tolerance of ±20%. A notable safety feature is the N2O blocking device, which halts N2O supply if O2 pressure drops below 0.4 bar ±0.2 bar. Additionally, the Hypoxyguard system ensures a minimum of 30% O2 in the gas mixture.

Design and Connectivity
The flowmeters are constructed with anodized aluminum and feature connections for O2, Air, and N2O at the bottom, suitable for hospital centralized gas systems or cylinders with pressure regulators. The outlet connection is a conical 23 mm F ISO DIN 5356/1, and the inlet connections are hose connectors with a diameter of 6 mm.

Additional Features
The flowmeters include a quick dosage feature for O2, capable of supplying more than 45 L/min when activated. The integrated mixing device ensures proper gas proportions, maintaining at least 30% O2 in the mixture. The units are equipped with antistatic and graduated tubes, and an anesthesia evaporator can be connected at the outlet.

Conclusion
The FM series flowmeters are robust devices designed for precise and safe delivery of medical gases, equipped with multiple safety features and connectivity options to suit various medical environments.