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➨ Never operate the pump if covers or other parts of the
pump are disassembled.
➨ Before starting maintenance, disconnect the electri-
cal power cord. Wait 5 seconds after isolating the
equipment from AC power to allow the capacitors to
discharge.
➨ Ensure that the pump cannot be operated accidentally.
➨ Note: The pump might be contaminated with the pro-
cess chemicals that have been pumped during opera-
tion. Ensure that the pump is decontaminated before
maintenance.
➨ Avoid the release of pollutants.
+ Never operate a defective or damaged pump.
+ Take adequate precautions to protect people from the
effects of dangerous substances that may have con-
taminated the pump and may be released upon dis-
assembly. Ensure that the maintenance technician is
familiar with the safety procedures which relate to the
products processed by the pumping system.
Use appropriate protective clothing, safety goggles and
protective gloves.
+ Check every motor capacitor regularly by measuring its
capacity and estimating its service life. Replace old ca-
pacitors early enough to prevent a failure. The capaci-
tors must be replaced by a trained electrician.
+ Allow sufcient cooling of the pump before starting
maintenance.
+ Vent the pump and isolate it from the vacuum sys-
tem before you start maintenance.
Replacing diaphragms and valves
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