Air Flow Meter 1.0" clamps onto a sch 40 pipe, RS485.

5200-10S-SC : Compressed Air & Nitrogen Flow Meter 1" clamps onto a sch 40 pipe.Output RS-485 serial communicaiton (This meter is pipe size specific - select part number by pipe size and material ) with two flowsensing probes projecting into the pipe through 3/16-in. drilled holes. It seals directly to the pipe; no cutting or welding is required for installation. Digital Display. Flow Range 1-80 scfm.
 
Each meter is furnished with a 18-Volt 300 MA wall plug dc power supply for 110 VAC with a 20 ft cable.

 
Required accessory is a 5200-DG, drill guide.