Agilent Technologies Turbo-V 2K-G Serie Manual De Instrucciones página 316

17 Technical Information
Interconnections
Instead of switch is possible to use transistor.
Figure 19
Figure 20
PURGE/VENT VALVES: the pump integrates the "purge" and "vent"
valves. The two valves are Normally Closed so if a power fail occur,
the valves will remain closed.
In remote mode you can open the purge valve (N.C.) connecting
pin10 of J1 to pin 9, or supplying 24 Vdc between pin 10 and pin 15.
The same thing occurs for the vent valve with pin 12.
Note that the vent and purge valve can also be controlled by means of
the serial connection (see the following diagram for details).
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Soft Start, Speed Setting, Purge, Vent
Turbo-V 2K-G Pumping System User Manual / 87-900-968-01 (G)