Features of the Model FT1 include retractors for five probe sizes (15, 18, 24, 30 and 36”); Hart communication option; FM and FMc (Canada) Class I, Division 1 approvals; ATEX and IECEx Zone 1 approvals; and additional gases in the Gas-SelectX material selection menu. The gas menu allows users to choose air, argon, butane, carbon dioxide, methane, natural gas, nitrogen, oxygen, helium, hydrogen, propane and three-gas mixes. The three-gas mix can be any combination of three gases available in the gas menu. Other features of the thermal flow meter include an in-situ calibration validation routine; RS485 Modbus RTU or BACnet MS/TP communication protocols; a standard USB port to allow direct meter-to-PC connections; and software for configuring, graphing and logging data.