WPI PZMIII Instruction Manual download pdf (Page 10)

6 World Precision Instruments

INSTRUMENT DESCRIPTION

Secondary Vent Port

(Vacuum/Atmosphere)

econ

(Vac

uum

Solenoid Input

Selector Switch

Hold Pressure

Gauge

Hold Pressure

Gauge

Vacuum

Pressure

Gauge

Eject Pressure

Gauge

Eject Pressure

Gauge

PV820

PV830

Solenoid

Controls

Solenoid

Controls

Eject Port

noi

Inp

ect

Swi

tch

ole

essure

Power

Switch

Secondary Vent Port

Selector Switch

acuum

ssur

Gau

Fig. 7—The major features of the PicoPumps are labeled in this diagram.

Regulators/Gauges– The PV820 has a hold pressure regulator and an eject pressure

regulator. In addition to those two, the PV830 also has a vacuum regulator. Each

precision regulator is connected with a measuring gauge for monitoring the pressure that

ﬂ ows through the regulator.

Adjust the pressure by turning the Regulator knobs located near 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), reproducible pressures

may be obtained, because the pressure regulators have a 20-turn 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: Be careful NOT apply too much pressure when turning the knobs fully

counterclockwise to minimum pressure. They cannot be adjusted to 0.0 PSI.

Over-tightening the knobs damages the regulators.

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WPI PZMIII Instruction Manual Page 10

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