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•OK state – signals that the oil drip rate exceeds a
•Drip rate count– transmits the oil drip rate to the SCADA room, thereby providing the data to calculate oil consumption.
•Lack of oil alarm – the Dripmaster detects and warns of a lack of lubrication, as a result of an empty oil tank or blockage in the oil inlet or outlet.
Manual operation is possible using the OPEN and CLOSE push buttons on the control panel. The
Switching between the
Search Feature
In exceptional cases, where only a few drops are counted, or none at all, the drip search function is activated. This situation occurs if there is needle valve blockage or when there is a continuous flow of oil. In the continuous flow case, there are no individual drops and consequently no counter readings. Continuous oil flow may occur when filling an almost empty oil tank, for example. In case of partial blockage, the drip search function scans until drops appear (the needle valve opens continuously until drops are detected). If no drops are detected during the drip search (if the oil blockage or continuous oil flow persists), then the needle valve eventually reaches its upper limit, the UL LED illuminates briefly, and the motor changes its direction of rotation and starts to close the needle valve (Figure 10).
Control circuitry interface
Servo motor
Overflow/vent hose
Oil inlet
Manual oil flow switch
Internal solenoid
Needle valve assembly
Lower Limit switch
Upper Limit switch
Photoelectric sensor
Oil outlet
Drip verification peephole
Figure 10: Dripmaster EDD-4C Needle Valve Assembly
When and if oil drops are detected, the search function stops, and normal stabilization resumes. If no drops are detected while the needle valve is closing, then the needle valve eventually reaches its
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