VAF Open Channel Ultrasonic Flow Meter

Product Description

MEASURING WASTEWATER FLOW The basic step in designing wastewater discharge, collection and treatment systems is determining the wastewater flow rate. For these systems to work properly, for investment costs to be minimized and, if the systems are shared by more than one group, for contribution shares to be determined, reliable information from actual measurements of the existing and estimated flow must be available. Where wastewater flow cannot be determined, flow is calculated from statistical information on water consumption, population and industry. Routine measurement of wastewater flow in wastewater treatment plants is essential for sound design and operational control of the plant. Knowing average and daily flow variations helps with determining the daily amount of chemicals to be added to the system, the amount of air to be supplied, the sludge return ratio, building flow records for plant expansion, learning about infiltration, industrial discharge into the sewer system and population growth from significant flow increases in dry weather, and estimating storm-water contribution from significant flow increases in wet weather. Suitable places for a flow measuring device in treatment plants include above the channel and inspection chamber, the plant inlet, the outlet of the bar screen, grit chamber or pre-sedimentation, the main lift line of the pump station, and before discharge to the receiving environment. Open-channel flow is measured with the help of primary devices such as weirs and flumes (e.g. Parshall flume), where the water level upstream and downstream of the throat can be clearly distinguished. Applications: Open-channel ultrasonic flow meters offer non-contact and reliable solutions for measuring free-surface flows. They are preferred especially in wastewater treatment plants, environmental monitoring systems, stream and channel monitoring applications and industrial wastewater lines. Mounted suitably for the channel or weir type, they calculate flow precisely. Their maintenance-free construction, resistance to harsh outdoor conditions and continuous data tracking provide important advantages for environmental compliance and process control.

Technical Specifications