GenTech Flowmeter Regulators Heliox Flowmeter Regulators are designed for use in respiratory urgent care and respiratory treatment purposes. The GENTEC Heliox Flowmeter Regulator is calibrated for 80/20 heliox (80% helium / 20% oxygen) . Use our heliox flowmeter regulator to avoid the conversion errors that occur when using standard oxygen or air flowmeters. 197HX – 12L. GenTech, Flowmeter Regulators, GenTech, GenTech Flowmeter Regulators Diaphragm – type Regulator with 0 – 12 LPM Flowmeter, CGA 280 Inlet 197HX – 12L.