The new flow sensor launched by Clark is ideal for solar and geothermal hot water systems and equipment.
DN Series Flow Sensors are very accurate at low cost. Their accuracy is to 1% fs of measured value and are available for less than $100 in quantity.
To assist documentation of energy transfer in water & water glycol based heat exchange systems, DN Series Liquid Vortex Flow Sensors provide direct temperature measurement.
The new DN Series Flow Sensors operate on the principle of Kármán’s vortex trail and can be used for flow ranges from 0.9 to 150 liters per minute. Vortex-shedding flow meters were named after Theodore von Kármán’s mathematical description of the phenomenon. They present the flow in a pipe with an obstruction/bluff in the flow meter body.
Alternating vortices are formed on each side of the bluff body as velocity increases, and travel downstream.
DN series flow sensors use piezoelectric sensors embedded in an ETFE vane located downstream of the bluff to detect the generated vortices. Flow velocity is given by the frequency measured. The measurement result is not dependent on temperature and pressure loss is minimal. A flow factor is provided to convert frequency to volume flow rate for each model size. The series offer versions with a 1000 Ohm RTD temperature sensor built-in to the bluff, providing direct temperature measurement in the medium.
