3-6 Uson 628 Operator’s Manual
3.2.5 Pneumatic Connections
• The test component, air supply, and vacuum supply (if required) should be
connected to the appropriate ports using the tubing provided.
• The owner is responsible for step-down pressure regulation if the available
supply pressure exceeds the tester’s input limit.
• The air supply to the tester must be clean, dry, and free from contamination; it’s
recommended that an external filter/regulator should be fitted to improve the
quality of the air supply to the tester. See Figure 3–3.
• The air inlet pressure must be within these minimum and maximum limits:
Minimum:6 bar (80 PSI) or 1.5 bar (20 PSI) above the test pressure,
whichever is the greater; Maximum: 17 bar (255 PSI).
• The pressure regulation knob and spindle must be fitted to the regulator body.
See Figure 3–1. (Manual version only.)
Figure 3–3: Pneumatic Connections
WARNING: To avoid damaging the transducer, before testing, ensure the
component to be tested, and the air supply line to the Uson 628, are free from
water or liquid residue. The use of an external dump valve or an in-line filter is
recommended for contaminated components.
WARNING: DO NOT omit the exhaust fitting connection. DO NOT run exhaust
to the interior of the enclosure as this could injure personnel and damage the
tester.
Step-down Regulator
Mist & Particulate Filter
Uson 628 Tester
Compressor
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