WPI PicoPump PV830, Инструкция по эксплуатации

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PV830 Pneumatic PicoPump
World Precision Instruments 9
OPERATING INSTRUCTIONS
Front Panel
Fig. 10—PV830 Front Panel.
!
CAUTION : The valves always pass some air. Do NOT apply too much
pressure when turning the knobs. They will not reach zero while the PV830 is
running. Over-tightening the knobs will damage the regulators.
Pressure Adjustment– Adjust the pressure by turning the Regulator knobs located
next to the pressure gauges. Turn the knob clockwise to increase the pressure, and
counter-clockwise to decrease it. Because the regulating mechanism is self-venting,
pressure is automatically released when the regulator setting is decreased. Although
the pressure gauges cannot be read with high accuracy (especially at pressure
settings below 2PSI), very reproducible pressures may be obtained, because the
pressure regulators have a 20-turn dial yielding good pressure resolution.
The pressure regulating mechanism functions by continuously bleeding a small
amount of gas. This bleed rate increases as the difference between the input
pressure and the output pressure increases. Loss of gas may be minimized by
decreasing the difference between the input and output pressures, but some
decrease in regulation may be noticed if the input pressure is not at least 10%
greater than the output pressure.
!
CAUTION
: To conserve tank contents, make sure to turn off the gas supply
pressure when the PV830 is not in use.
Vent– The vac/hold switch selects between venting the Eject pressure port to either
the Hold pressure (hold) or to the vac/atm line (vac). If the vacuum line is not in use
and the switch is set to vac , the pressure port is vented to the atmosphere.
Vacuum Adjustment– 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