Caution; Clogging Of Filter Element; Pressure-Releasing Device; Exhaust Of Inflammable Gas And Gas Having Property Of Increase The Susceptibility Of Substances - Ulvac TM-2 Instruction Manual

5. Caution

5.1 Clogging of Filter Element

Clogged filter elements will raise the pressure inside the pump, and cause damage to pump parts
or filter elements. The pressure must be watched with a pressure gauge (option) in usage such
as;
(3) When making the pump operate under high intake pressure, or evacuating high
temperature gas continuously.
Such usage raise the pump temperature and deteriorate the oil to sludge. Sludgy oil
adheres to the filter element and causes clogging. Moreover, in continuous usage under
such conditions, a great amount of oil mist will be trapped in the filter element and make
an oil film on its fibers and cause being clogged even with non-deteriorated oil.
(4) When evacuating high-viscosity Liquid at· fine particles in normal temperature.
(5) When there is a reaction product.
To control the timing of filter element change, we recommend installation of pressure gauge
for other usage, too. Moreover, frequent need for filter element change suggests the use of an
oil mist trap one rank higher.

5.2 Pressure-releasing Device

The Pressure-releasing devices are designed to prevent rapid pressure rise inside a pump. If this
device constantly operates, it is dangerous to keep the pump running. In such cases, stop the
pump immediately and change the filter element. Also, while this device is operating, oil mist
exhausted from the pump will not be trapped in the filter element, but be exhausted directly from
the air outlet of the oil mist trap.
5.3 Exhaust of Inflammable Gas and Gas having property of increase the susceptibility of substances to bum
In case of the process for the inflammable gas such as hydrogen or the gas having a property of
increase the susceptibility of substances to burn such as the oxygen, following countermeasure
shall be taken. Otherwise, oil mist trap explosion may occur.
(1) Please use duct piping made of electrically conductive materials (electricity conducting)
without exception. If non-electrically conductive materials are used, static electricity shall
be generated when the exhaust gas passes that results in an origin of ignition by charged
electricity and generation of sparks. Ground the duct piping appropriately.
(2) The exhaust outlet shall be in a flammable status by filling oil mist at atmospheric pressure.
Please fill dilution gas from the space between the pump and the oil mist trap.
(3) Please flow dilution gas from' the aspiration side, if necessary. (Decide the volume of
dilution gas by confirming the pump performance because it may decline the pump
performance. )
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