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Maintenance
Perform these periodic checks to assure trouble-free operation. This maintenance prevents costly down-time and cleaning
procedures. Maintain a day-to-day log of pump and system performance to identify marked variations that require correc-
tive action.
Periodic Inspections
The maximum interval between inspection of the pump is
established on the basis of experience.
WARNINGS
❑
High voltages (up to 480 V) can kill.
Always break the primary circuit to
the power supply before starting
work on the heater or its wiring.
❑
Avoid the possibility of serious burns
by making sure that the pump is at
room temperature before attempting
service.
❑
Always wear appropriate gloves and
clothing and use a self-contained
breathing apparatus. Poisonous or
corrosive compounds may be present
when opening the fill or drain.
❑
Explosion risk is high if the fill or
drain is opened when the pump is
running or when it is hot.
High Throughput Diffusion Pumps
41
To perform general maintenance, do the following:
1. Check the condition and level of fluid when the
pump is cold. Withdraw a sample through the drain
and visually check the level of fluid through the sight
glass. Slight discoloration of the fluid does not affect
pump performance. Use new O-ring gaskets when
replacing fill and drain plugs.
Loss of the fluid can be caused by:
❑
Admittance of excessive air or other gas to a hot
pump
❑
Inadequate water cooling
❑
Continuous operation in the overload range as
given in Table 4 on page 12
❑
Failure to reinsert the foreline baffle in the pump
assembly
NOTE
The HS-32 does not have a
foreline baffle.
2. When the pump is cold, check that the heaters are
bolted snugly to the boiler plate and that all heater
terminal connections are fastened tightly inside the
junction box.
3. Check the total heater power input and balance of
the load.
4. Ensure that cooling water flow is unobstructed and
that the flow rate does not fall not below quantities
specified in Table 4 on page 12.
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