DPM-12GM-6-P1A-FP10-F-V1 10/31/2018
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ROCON LLC
HOW THE DELTAPOINT MONITORS COOLING WATER IN THE
ROBOTICS CELL
Each DeltaPoint unit has two vortex shedding flow meters. One flow meter monitors the supply path,
and the other flow meter monitors the return leg. The fluid strikes a bluff body, generating vortices
(eddies) that move downstream. The vortices form alternately, from one side to the other. A
piezoelectric sensor housed in a sensor tube directly downstream of the bluff senses the pressure
zones created by the vortices. The sensor generates a frequency directly proportional to the vortices
(flow). The pulses are then measured by the microprocessor.
An internal temperature sensor, housed in a small thermo-well downstream of the return flow sensor,
measures the fluid temperature.
The robotic cooling water enters through the SUPPLY port and travels through the inlet flow sensor,
continues through the TO CELL port and to the equipment to be cooled. Water that has cooled the
equipment reenters the unit through the FROM CELL port, through the return flow sensor and is then
discharged into the plant return water system.
The inlet and outlet flow meter signals are compared. When a cap is pulled or a hose bursts the flow in
the return leg drops below the supply leg. The microprocessor detects this difference and signals the
PROFINET master to stop welding. It also shuts off the cooling water via a solenoid valve in the supply
leg and a check valve in the return leg, thus stopping the water flow in both directions.
