GFM Mass Flowmeter

Due to the numerous variations of options available (gas, fitting size, flowrate etc.), please click on this link to configure a proper part number based on the specs which you can select from the dropdown options. Once all the proper components have been selected, a part number will be provided. Cut and paste this number and  send it to us via our web site link and a formal quote will be sent to your company.

GFM Mass Flowmeter
A low cost solution to thermal mass flow metering for gases is presented by Aalborg in introducing the model GFM mass flow meter line.

The GFM design combines the convenience and accuracy of conventional mass flow devices with low costs previously unattainable. Each of these meters incorporate an advanced straight tube sensor in conjunction with flow passage elements constructed of aluminum and brass for non-corrosive gases or 316 stainless steel for corrosive applications.

Principles of Operation

Metered gases are divided into two laminar flow paths, one through the primary flow conduit, and the other through a capillary sensor tube. Both flow conduits are designed to ensure laminar flows and therefore the ratio of their flow rates is constant.

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. The resultant temperature differential is proportional to the change in resistance of the sensor windings.

A 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.

Output signals of 0 to 5Vdc and 4 to 20mA are generated indicating mass molecular based flow rates of the metered gas.

Flow rates are unaffected by temperature and pressure variations within stated limitations.

General Description

Compact, self contained GFM mass flow meters are designed to read flow rates of gases. The rugged design coupled with instrumentation grade accuracy provides versatile and economical means of flow control.

Aluminum or stainless steel models with readout options of either engineering units (standard) or 0 to 100 percent displays are available.

The mechanical layout of the design includes an LCD readout built into the top of the transducer. This readout module is tiltable over 90 degrees to provide optimal reading comfort. It is connected to the transducer by a standard modular plug, and is also readily removable for remote reading installations. Transducers without LCD readout are offered for OEM applications.

GFM mass flow meters are available with flow ranges from 10 sccm to 1000 sL/min N2. Gases are connected by means of 1/4” 3/8” 1/2” compression fittings and 3/4” FNPT fittings. Optional fittings are available. These controllers may be used as benchtop units or mounted by means of screws in the base.

Transducer power supply ports are fuse and polarity protected.

Leak Integrity

1 x 10-9 smL/sec of helium maximium to the outside environment.

Design Features

  •  rigid metallic construction
  •  available flow ranges starting from 0 to 10 sccm up to 0 to 1000 slpm
  •  maximum pressure of 1000 psig (70 bars)
  •  leak integrity 1 x 10-9 of helium
  •  NIST traceable certification
  •  built-in tiltable LCD readout (some models)
  •  0-5 Vdc and 4-20 mA signals
  •  circuit protection
  •  can be used as a portable device
  •  engineering units or 0 to 100% displays
  •  totalizer option

THE FOLLOWING ARE SOME EXAMPLES OF MASS FLOW METERS CONTACT US FOR OTHER  APPLICATIONS (FLOWS AND GASES)

ALUMINUM 

MODEL GAS

 MAX.

FLOW

MATERIAL FITTING DISPLAY (LCD)  
  POWER

INPUT/OUTPUT        SIGNAL


GFM17A001 N2 10L/MIN ALUMINUM 1/4" COMPRESSION NO Universal n.a. / 0-5Vdc
GFM17A002 N2 10L/MIN ALUMINUM 1/4" COMPRESSION YES Universal n.a. / 0-5Vdc
GFM17A003 N2 10L/MIN ALUMINUM 1/4" COMPRESSION NO Universal n.a /  4-20mA
GFM17A004 N2 10L/MIN ALUMINUM 1/4" COMPRESSION YES Universal n.a /  4-20m

STAINLESS STEEL

MODEL GAS FLOW MATERIAL FITTING DISPLAY (LCD)  
  POWER

INPUT/OUTPUT        SIGNAL


GFM17S001 N2 10L/MIN STAINLESS STEEL
1/4" COMPRESSION NO Universal n.a. /  0-5Vdc
GFM17S002 N2 10L/MIN STAINLESS STEEL
1/4" COMPRESSION YES Universal n.a. /  0-5Vdc
GFM17S003 N2 10L/MIN STAINLESS STEEL
1/4" COMPRESSION NO Universal n.a. /  4-20mA
GFM17S004 N2 10L/MIN STAINLESS STEEL
1/4" COMPRESSION YES Universal n.a. /  4-20mA


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