Brooks Instrument 5850E - Manual (Page 22)

Brooks ® Model 5850E
3-2
Installation and Operation Manual
X-TMF-5850E-MFC-eng
Part Number: 541B102AAG
September, 2009
Section 3 Operation
Precision 5 Volt Reference
This allows direct connection of a command potentiometer to provide a 0-5
Volt command signal to the controller. A precision ten-turn 2K ohm
potentiometer, with an integral turn counter, is recommended as this will
permit repeatable adjustments of command to one part in 1,000. Refer to
Section 2-13 for activation.
Valve Override
Allows, independent of the command setting, full opening and closing of
the control valve. Refer to Section 2-8.
Valve Off
Accessed via Terminal L on the Card Edge or Pin 4 on the D-Connector
version, this feature allows the user to close, independently of the
command signal, the control valve by supplying a TTL level low signal to
the proper terminal. This function is useful when performing repetitive flow
operations or as a safety shutdown. Refer to Section 2-11.
Valve Test Point/Purge
Accessed via terminal D on the Card Edge or Pin 7 on the D-Connector
version of the Model 5850E only. This feature allows the user to monitor
Figure 3-1 Flow Sensor Operational Diagram