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Operation
Dual PCU (Pressure & Vacuum) Models 3
3-3
3. If either the system or handpump selector valve is set for vacuum, when pressure is
applied to the system, the safety valve fitted to the front of the PCU mounting
assembly will be ejected, venting the system. (The safety valve is retained by the
assembly, and will not “fly-out” of the instrument). This is to limit the possible
damage caused by pressurizing a vacuum instrument under test. Simply set the
selector valve(s) to the correct position, and reset the safety valve by pushing the
safety plug back in.
4. Pressure Mode: Operate as per Single PCU Models - Pressure, above.
5. Vacuum Mode: Operate as per Single PCU Models - Vacuum, above.
gjn013.bmp
Figure 3-1. Weight Rotation
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