２５
5. Troubleshooting
Situation
Cause
Countermeasure
Room temperature is too high.
Adjust the room temperature to
25°C or less.
Used for a short time directly
after
installation
or
after
prolonged disuse.
Let the device run for 24 to 48
hours and then recheck.
Examine the area around the
affected
part
before
the
maximum pressure is affected.
Ex: Hermetic, etc.
There is a leak.
Clean the glass bell jar’s
O-ring.
Oil from the oil diffusion pump
has degraded.
If air has accidentally been
allowed to enter or if there is
some other obvious reason for
the oil to degrade, replace the
oil.
Coolant water is too hot.
Insufficient cooling water.
Set the water temperature to
20°C.
Maintain supply of 1.5 L/min.
Using a sample which emits a
large amount of gas.
Ex: Plastic base material, etc.
Change the sample material.
Extend the evacuation time.
Oil-sealed rotary vacuum pump
is defective.
Refer to the oil-sealed rotary
vacuum pump user manual.
Max. pressure low
or
Max. pressure unsteady
or
Evacuation power reduced
Measurement
device
is
defective.
Replace the device.
Oil diffusion pump does not
warm up
Heater broken.
Replace the heater.
Evaporation
source
short
circuit.
Replace evaporation source.
Current does not flow to the
electrode even when the
electrical evaporator control
is used
Electrode short circuit inside
the feed through collar.
Repair the location of the short
circuit
and
restore
the
insulation.
Oil-sealed
rotary
vacuum
pump thermal overload relay
of electro-magnetic contactor
moves.
Overloading.
Refer to the oil-sealed rotary
vacuum pump user manual.
Manual reset .
Rotate the handle clockwise
until is grows heavy, then
tighten more.
Clean the main valve seat seal.
The Pirani vacuum gauge
pressure is reduced when the
bell jar is vented to the
atmosphere
Main valve shutoff defective.
Overhaul
the
main
valve.
(handled at our location)
