Connection B - Fore-Vacuum Pump; Connection C - Electrical - Agilent Technologies Turbo-V 81-M Bedienungshandbuch

17 Technical Information
Typical Layout Diagram

Connection B - Fore-Vacuum Pump

A flange KF 16 NW is available to connect the Turbo-V 81-M pump to
the fore-vacuum pump. A hose or vacuum approved pipe can be used.
If a rigid pipe is used, any vibration generated by the mechanical
pump must be eliminated through the use of bellows.
The Turbo-V 81-M pump is characterized by its high compression ratio also for
NOTE
oil vapors. When using a mechanical oil-sealed pump, it is advisable to install a
suitable trap between the turbopump and the fore-vacuum pump in order to
prevent oil backstreaming.

Connection C - Electrical

Figure 33
The turbopump is connected to the controller through an 6-pin
connector. Pins B, C and D are the 3-phase supply to the motor, pins
A and F are connected to the temperature sensor (NTC type, 30 KΩ
resistance at 25 °C) and pin E is connected to the pump ground. If
the temperature sensor is disconnected, the pump will not start. To
prevent damage to the pump when the temperature exceeds 60 °C,
the sensor automatically cuts out the power supply.
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Turbo-V 81-M User Manual / 87-900-983-01 (E)