TECHNICAL INFORMATION
87-900-806-01 (F)
2
GENERAL
The 969-9831 Turbo-V vent device, consisting of a vent
control unit and a vent valve, is a complete unit suitable
for automatic venting of the Turbo-V pump when it is
switched off or during a power failure switch (refer to the
following figure).
The Vent device is powered by the Turbo-V controller
and a battery back-up capability is built in.
Vent Valve and Control Unit
The 969-9831 Turbo-V vent device consists of:
−
03-660270 vent control unit
−
03-661835-02 vent valve
Vent Control Unit
The vent control unit is powered by the Turbo-V
controller (120 Vac, 50/60 Hz) via the power
interconnecting connector. The vent control unit is
provided with 4 rubber feet at the bottom and it is not
suitable for rack mounting. Two LEDs indicate when the
mains is supplied (yellow LED) and when the valve is
open (red LED).
When the supply voltage is present (Turbo-V pump ON),
relay RL1 allows the integral battery to be recharged,
then the timer circuits are inhibited and reset. When the
Turbo-V is shut off, RL1 still remains energized and the
delay timer counter starts.
After the pre-set delay time, the valve opens and the
venting time count starts. At the end of the venting time,
relay RL1 de-energizes and the battery is disconnected.
The battery is protected against short circuits.
Depth of discharge and the charging cycle are a function
ambient temperature. At high temperatures the battery
capacity increases while it decreases at low
temperatures.
Vent Valve
The vent valve consists of a small normally-closed
straight through, electromagnetically-actuated and viton-
sealed valve with an NW 10 KF flange on the high
vacuum port and a filter or adapter tube 1/4” on the air
entrance port. The valve closes under control of a
metallic spring and opens when power is supplied to the
valve electromagnet.
NOTE
A riffled nozzle is provided for use in lieu of the sintered
filter when the Turbo-V pump is vented by the dry gas
bottle (line).