STP-301/451 Series Instruction Manual
5-2
Installation
5.2 Cooling the STP Pump
There are two methods for cooling: Water cooling and Air cooling.
When performing baking, cool the STP pump.
Also, when pumping gases, cool the STP pump as well.
Select the best method which fits your vacuum equipment.
5.2.1 Water Cooling Method
When cooling the STP pump by water cooling, use a water cooling unit (optional accessory).
Attach the water cooling unit using 4 screws at screw holes for legs (8-M8
*1
, depth 16 mm).
(For the positions of the screw holes for legs, see "External Appearance of the STP Pump".)
1) Connect the cooling water pipe to the cooling water port in accordance with Figure 5.1.
2) The female screw PT
*1
(RC) 1/4 is used in the cooling water port.
3) Use the connection hose of ID (internal diameter) 8 mm, and secure it to prevent water
leakage.
4) Use cooling water under the following conditions:
Amount of water: 2 L/min.
Temperature: 5 to 25 °C
Water pressure: 2.9×10
5
Pa (3 kgf/cm
2
) or lower
◇ 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 inlet/outlet port so that no
water will remain inside.
◇ The joint for the water cooling unit is made of brass. To prevent corrosion, connect
the brass joint.
*1
: JIS
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