These controllers may be used as benchtop units or mounted by means of screws in the base. Gases are connected by means of 1/4” 3/8” 1/2” compression fittings and 3/4” FNPT fittings. GFM mass flow meters are available with flow ranges from 10 sccm to 1000 sL/min N2. With no moving parts, the E-Series Ultrasonic meter is virtually maintenance-free and has greater extended low flow accuracy compared to mechanical meters. Transducers without LCD readout are offered for OEM applications. Since the MCU is in low-power mode for most of the time, it reduces the power consumption. Equipped with an easy-to-read, 9-digit LCD display, the ultrasonic meter presents consumption, rate of flow, reverse-flow indication, and alarms. It is connected to the transducer by a standard modular plug, and is also readily removable for remote reading installations. This readout module is tiltable over 90 degrees to provide optimal reading comfort. The mechanical layout of the design includes an LCD readout built into the top of the transducer. The rugged design coupled with instrumentation grade accuracy provides versatile and economical means of flow control.Īluminum or stainless steel models with readout options of either engineering units (standard) or 0 to 100 percent displays are available. On the other hand, an application to measure water flow to a vineyard may only require a measurement accuracy of 5 to 10. Some industrial applications require precise calculation of quantity, such as precision servo-valve development for the aerospace industry. Output signals of 0 to 5Vdc and 4 to 20mA are generated indicating mass molecular based flow rates of the metered gas.įlow rates are unaffected by temperature and pressure variations within stated limitations.Ĭompact, self contained GFM mass flow meters are designed to read flow rates of gases. Precision flow meters are used to provide accurate monitoring and/or flow control. The resultant temperature differential is proportional to the change in resistance of the sensor windings.Ī Wheatstone bridge design is used to monitor the temperature dependent resistance gradient on the sensor windings which is linearly proportional to the instantaneous rate of flow. Two precision temperature sensing windings on the sensor tube are heated, and when flow takes place, gas carries heat from the upstream to the downstream windings. Both flow conduits are designed to ensure laminar flows and therefore the ratio of their flow rates is constant. Metered gases are divided into two laminar flow paths, one through the primary flow conduit, and the other through a capillary sensor tube. Each of these meters incorporate an advanced "U"-shape tube sensor in conjunction with flow passage elements constructed of aluminum and brass for non-corrosive gases or 316 stainless steel for corrosive applications. The GFM design combines the convenience and accuracy of conventional mass flow devices with low costs previously unattainable. GFM mass flow meterA low cost solution to thermal mass flow metering for gases is presented by Aalborg in introducing the model GFM mass flow meter line. Flowmeters of debietmeters zijn meetinstrumenten die worden gebruikt om de doorstroming en/of hoeveelheid gas, damp of vloeistof dat zich door een buis beweegt te meten.