Provides a preset, fixed flow to instruments forcalibration. The inlet pressure is configurable from 250 psig to 3000 psig. The gas outlet is configurable from 0.25 slpm to 6 slpm. Included is an easy-to-read pressure gauge and easy on/off control valve.

Maintains a constant flow rate to help ensure accurate monitor calibrations even as cylinder pressure drops. N.I.S.T traceable and easy to operate.

Provides the correct gas flow to instruments that have internal pumps. Typical activation suction is from 0 to 3 inches of water column. The DFR can be configured for inlet pressures ranging from 250 psig up to 3000 psig.