Electronic Flowmeters
SMARTFLOW® Electronic Flowmeters are available in a range of sizes from 3/8" NPT to 2" NPT (F) inlet/outlet, and flow ranges from 0-8 gallons per minute to 10-110 gpm. The TRACER® Electronic Flowmeter with Self-Contained Digital Display measures liquid flow rate, temperature, and calculates BTU’s per minute. The TRACER® Switching Flowmeter with programmable SPDT Switch and Display measures liquid flow rate, temperature, and calculates BTU’s per minute while providing one programmable switching set point for high or low flow or temperature.
The Smartflow Products we recommend: Tracer™ Electronic Flowmeter with Liquid Crystal Display Tracer™ Electronic Switching Flowmeter

Turbulent Flow Reference Chart Approximate Minimum Flow (in gallons per minute) required for turbulent flow in drilled water passages based on Reynolds Number or 4000 Pipe Size ("NPT) Drilled Passage I.D. Flow Rate (gpm) Inches Drill size 1/16 .250 1/4 .33 1/8 .339 R .44 1/4 .438 7/16 .55 3/8 .593 19/32 .74 1/2 .719 23/32 .90 3/4 .938 15/16 1.17 1 1.156 1-5/32 1.44