Pulsafeeder PULSAtron Series MP EN - Manual (Page 24)

24
MAINTENANCE
: Before performing any maintenance or repairs on chemical metering pumps, be sure to
disconnect all electrical connections and insure that all pressure valves are shut off and pressure
in the pump and lines has been bled off.
Always wear protective clothing, gloves and safety glasses when performing any maintenance or
repairs on chemical metering pumps.
ROUTINE MAINTENANCE
1. Routinely check the physical operating condition of the pump. Look for the presence of any abnormal noise, excessive
vibration, low flow and pressure output or high temperatures [when running constantly at maximum stroke rate, the
pump housing temperature can be up to 160°F (70°C)]
2. For optimum performance, cartridge valves should be changed every 4-6 months. Depending on the application, more
frequent changes may be required. Actual operating experience is the best guide in this situation. Repeated short-
term deterioration of valve seats and balls usually indicates a need to review the suitability of wetted materials
selected for the application. Contact the supplier for guidance.
3. Check for leaks around fittings or as a result of deteriorating tubing e.g. when standard white translucent discharge
tubing is exposed to direct sunlight. Take appropriate action to correct leak by tightening fittings or replacing
components.
4. Keep the pump free of dirt/debris as this provides insulation and can lead to excessive pump temperatures.
5. If the pump has been out of service for a month or longer, clean the pump head/valve assemblies by pumping fresh
water for approximately 30 minutes. If the pump does not operate normally after this “purging run”, replace cartridge
valve assemblies.
DISASSEMBLY AND ASSEMBLY
DIAPHRAGM REMOVAL
1. Flush pump head and valve assemblies out by running pump on water or other suitable neutralizing solution. Wash
outside of pump down if chemical has dripped on pump.
2. Set stroke length of pump to 0% and unplug pump.
3. Disconnect tubing or piping from the pump. Remove the four pump head screws and then remove the pump head
assembly.
4. Remove the diaphragm by grasping it at the outer edges and turning it counterclockwise until it unscrews from the
electronic power module (EPM). Don’t lose the deflection plate or diaphragm shims which are behind the diaphragm.
Note shim quantity can be from 0 to 2.
5. Inspect diaphragm if it is intended to be used again. Look for indications of the TFE face being overstretched,
(localized white areas) or the elastomer on the back of the diaphragm being worn. Excessive amounts of either
condition require diaphragm replacement.