Campbell Scientific PVS4100/4120/4150 Portable Automatic Samplers - Manual (Page 79)

Section 5. Programming
5-39
5.6.4 OTHER OPTIONS - Pinch Valve
The following sequence of entries are made
on the Touchpad to describe how the
Sampler controller is to operate some of the
hardware specified in its configuration. The
ACTIVE SETTINGS are not being altered.
1. Press the SET key.
2. Press the OTHER OPTIONS key.
3. Press an ARROW key. Continue until
Pinch Valve is shown on the display.
4. Press the ENTER key.
The Pinch Valve option is for control of the solenoid activated pinch bar
determining vacuum / pressure modes in the sampler operation. This is a factor
usually set at the factory because it relates directly to the equipment
specification. It is alterable only to facilitate the use of the controller in plants
that have a variety of equipment configurations.
The display will show the response “PINCH
VALVE Normally Open / Closed”. All the
characters on the bottom line are flashing,
therefore the choice is made with the
ARROW keys. The choice is a toggle
between ‘Open’ and ‘Closed’. It represents
the state of the pinch valve when the
equipment is idle. Note: The sampler will
not perform properly if this setting is in
error.
Press ENTER. The display now reads
PINCH VALVE <ENTERED>,