The Stingray open channel flow logger from Greyline Instruments Inc. enables technicians to monitor wastewater velocity and flow without entering manholes.“A sewer manhole is a difficult environment. You don’t want to work an instrument keypad in one, if at all possible,” says Ernie Higginson, Greyline advertising manager. Compact and portable, the Stingray unit is designed for use in open channels, partially filled sewer pipes, and surcharged pipes. It works with municipal stormwater, combined effluent, raw sewage or irrigation water.To deploy the unit, a technician affixes a stainless steel bracket 12 to 16 inches into the influent pipe (or to the
