Model GFC mass flow controllers are designed to set and indicate flowrates of inert gases. Flowrates are set by a proportionating electromagnetic valve, and are unaffected by temperature and pressure variations within stated limitations. LCD screens are supplied with direct reading displays, and zero and span adjustments are conveniently accessible from the outside of the controllers.

Capillary sensor tubes are made from type 316 stainless steel. The large ratio of length to inside diameter ensures laminar gas flow within the tubes. Two precision windings heating the outside of the thin walled tubing serve as temperature sensing devices. For flowmeter operating principal, see the previous page.

Mass flow controllers are designed to operate only with clean, non-corrosive gases. Contaminated gases must be filtered to prevent the introduction of impediments into the sensor. The flow path consists of anodized aluminum, 316 stainless steel, brass, and O-rings made from Viton®. Connections are 1/4" compression Parker / Swagelok type. The flow controller is powered by a power supply transformer, which must be purchased separately.


Accuracy: 1.5% of full scale, including linearity for gas temperatures ranging from 59° F to 77° F (15°C to 25°C) and pressures of 10 to 60 psig (0.7 to 4.1bars).
Repeatability: 0.5% of full scale.
Temperature Coefficient: 0.15% of full
Pressure Coefficient: 0.01% of full scale/psi (0.07 bar).
Optimum Gas Pressure:25 psig (1.73 bars).
Maximum Gas Pressure: 500 psig (34.5 bars) maximum.
Gas and Ambient Temp.: 4° F to 122° F (5° C to 50° C).
Output Signals: Linear 0 - 5 Vdc (1000 ohms minimum load impedance); 4-20 mA (50 - 500 ohms loop resistance) maximum noise 20mV.
Transducer Input Power: +12Vdc, 1100mA
CE Compliance: EN 55011 Class 1, class B; EN50082-1