Instruction manual

PV820/PV830 Pneumatic PicoPump
World Precision Instruments 7
!
CAUTION: The regulators leak a small amount of gas as a part of their normal
operation. To conserve tank contents, make sure to turn off the main gas supply
pressure when the PicoPump is not in use.
Vacuum is adjusted by turning the vacuum Regulator knob located next to the vacuum
gauge. Turning the knob clockwise increases the vacuum (lower pressure), and counter-
clockwise decreases the vacuum. Because the regulating mechanism is self-venting,
vacuum is automatically released when the regulator setting is decreased. Although the
vacuum gauge cannot be read accurately at very low vacuum settings (below 2 in. Hg),
reproducible settings may still be obtained by means of the 20-turn dial regulator knob.
Solenoid Controls–When the solenoid valve is engaged, the eject pressure is routed
to the Eject port. The solenoid may be engaged by pressing the optional foot switch,
pressing the Start button or by an external TTL control. When the solenoid valve is
inactive, the hold pressure or vacuum is routed through the Eject port, depending on the
setting of the Solenoid Input Selector Switch. The solenoid controls are used to set the
timing and trigger the eject pressure bursts from the Eject port. The solenoid controls are
discussed later. See “Typical Setups” on page 8.
Solenoid Input Selector Switch–This switch determines what the solenoid routes to the
Eject port when it is inactive, hold pressure or vacuum.
• When this switch is set to Hold, the hold pressure is routed through the Eject port
when the solenoid is inactive.
• When this switch is set to Vent on the PV820 or Vac on the PV830, the vacuum is
routed through the Eject port when the solenoid is inactive. The Vac/Vent setting
allows the pressure ejection channel to have either atmospheric pressure or a
vacuum (depending on the position of the Secondary Vent Port Selector Switch)
on the line when the eject pressure is not being applied.
Eject Port–The output of the solenoid is routed through this port, either eject pressure
(when the solenoid is active), or hold pressure or vacuum (when the solenoid is inactive).
Secondary Vent Port–On the PV820, this is the Hold Pressure port, and on the
PV830, it is the Vacuum port. Either vacuum or atmospheric air is routed through this
port, as determined by the setting of the Secondary Vent Port Selector Switch. The
operation of this port is independent of the solenoid-controlled pressure line.
Secondary Vent Port Selector Switch–When this switch is set to Vac, the external
vacuum source is routed through the Secondary Vent Port. On the PV820, the vacuum
must be pre-regulated by an external regulator. On the PV830 the vacuum runs through
a regulator. When the switch is set to Pressure on the PV820
or ATM on the PV830, the
port is open to the atmosphere and not connected with any vacuum or pressure source.
Power Switch– Switching the Power on ( | ) provides power for the solenoid and timing
circuit. An amber light above the switch indicates when power is on.