Varian VHS-250, Инструкция по эксплуатации

Страница: 33 / 60

VHS-4, VHS-6 and VHS-250 Diffusion Pumps
D
R
A
FT 3/9
/
05
1-13
1.2.7 Thermal Switch
The pump has been fitted with a manually-resettable thermal switch that is preset at the
factory. This switch is located in a box near the bottom of the pump and provides protection
to the pump in the event of excessive fluid loss, the loss of cooling water, or high inlet
pressure.
WARNING
Failure to properly connect the thermal switch circuit can result
in catastrophic injury to personnel and major damage to the
pump or vacuum system.
❑
Connect the thermal switch in series with the heater.
In the event of overtemperature. the thermal switch opens and shut off the power to the
pump.
Reset the thermal switch by pressing the button located at the center of the thermal switch.
Do this only after the root cause of a problem has been determined and the appropriate
corrective action taken.