STP-603/1003 Series Instruction Manual
5.2
Cooling the STP Pump
Installation
There are two methods for cooling: Water cooling and Air cooling.
When performing baking, always cool the STP pump.
When pumping gases, cool the STP pump.
Select the best one which fits your vacuum equipment.
5.2.1
Water Cooling Method
Connect the cooling water pipe to the cooling water port in accordance with
Figure 5.1.
The female screw PT (Rc)1/4 is used in the cooling water port.
Secure the connection hose to prevent water leakage.
Use cooling water under the following conditions:
Amount of water:
2 L/min
Temperature:
5
to
25
℃
Water
pressure: 2.9
×
10
5
Pa (3 kgf/cm
2
) or less.
◇
Use clean water as much as possible.
Cooling water containing foreign materials may corrode or clog the
cooling water pipe.
When the cooling system is clogged with foreign materials, clogs
may possibly be removed by feeding cooling water reversibly.
◇
When the STP pump is overheated due to shortage or suspension of
water, the protective function detects the overheated condition in
the STP pump and stops the STP pump.
As a further safety procedure, attach a flow switch to the cooling
water exit so that the STP pump stops if abnormal cooling water
flow occurs (A flow switch is available on the market).
◇
When the STP pump is not to be used for a long period of time or it
is to be moved after use, introduce compressed air from one side of
the cooling water port so that no water will remain inside.
◇
The joint for water cooling unit is made of stainless steel. To
prevent corrosion, connect the stainless steel joint.
5-3