Direct Read Variable Area Flow Meters for Air, Water, N2, H2, CO2, Ar, He, and O2. Rib-Guided or Fluted Metering Tubes Facilitate Stable, Accurate Readings. Magnifier Lens in Front Shields to Enhance Reading Resolution. Interchangeability of Flow Tubes and Floats. More
Designed for direct read flow rates, the FLD Series Variable Area Flow Meter is a precision instrument embodying the inherent simplicity, versatility and economy of the classical Variable Area Flow Meter. It is particularly suitable for metering carrier gases in chromatography, indicating and controlling gases in manufacturing processes, liquid and gas measurement in laboratories, pilot plants, flow and level indicating, etc. Shipped completely assembled, flow meters include standard mounting fittings in a choice of materials, side plates, thick protective magnifying front shield and back plate, built-in control valve, and flow tubes.
Panel-mounting style is convertible to bench mounting through the use of the optional acrylic tripod, FLTR-1. The tripod has a built-in spirit leveler and leveling screws.
Meters come with built-in 6 turn needle valves, high precision metering valves with “non-rising stems” 16 turn, or with no valves. The higher cost of the high resolution valves is justified whenever high sensitivity control and resolution are desirable-particularly in conjunction with metering tubes of very low flow rates.
Generally, for gas metering it is recommended that valves are positioned at inlets (bottom) for liquids valves may be positioned either at inlets or outlets (top). For vacuum services, valves must be mounted at outlets. If unspecified at the time of ordering, meters will be shipped with valves mounted at the inlets.
The FLD Series rotameters are available for air, water, argon, helium, carbon dioxide, hydrogen, nitrogen and oxygen.
The online configurator may not contain all available options. If you do not find what you are looking for, please contact us.
Standard Accuracy: ±5% of full scale (FS)
Useful Flow Range: 10:1 minimum
Maximum Operating Pressure: 200 psig/13.8 bars
Maximum Operating Temperature: 121°C (250°F)
Flow Tubes: Heavy walled borosilicate glass
Floats: Glass, red sapphire, 316 stainless steel, carboloy and tantalum
Choice of Mounting Fittings in Contact with Fluids: Aluminum, black anodized or 316 stainless steel
Side-Panels: Aluminum, black anodized
Front Shield: Polycarbonate resin with longitudinal magnifier lens for enhanced reading resolution
Back Plate: 1/8' thick white acrylics
O-Rings and Packing: Buna O-rings in aluminum/brass model. FKM O-rings in stainless steel meters
Optional: Perfluoroelastomer and EPR
Connections: 1/8 NPT female inlet and outlet connections
Complete informations can be found in the spec sheet (PDF), see the "Download" section.
A thermal mass flow meter measures the flow rate of gas mass based on the convective heat transfer of a heated surface to the flowing fluid. The components of a basic thermal mass flow meter include two temperature sensors with an electric heater between them. The heater can protrude into the fluid stream or can be external to the pipe.
In the past, mass flow was often calculated from the outputs of a volumetric flow meter and a densitometer. Density was either directly measured, or was calculated using the outputs of process temperature and pressure transmitters...