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3-4. General Startup Practice Considerations (Cont.)
2. Perform a zero check on the instrument as follows (Cont.)
c.
If necessary, adjust the pen or pointer by turning the zero adjust on the
instrument.
3. Check the manifold and piping for leaks as follows.
a. Open the bypass valve(s), then open one shutoff valve to pressurize the
instrument.
b. Close the shutoff valve and the bypass valve.
c.
Any leakage will be indicated by pen or pointer movement, up or down
scale.
NOTE: Be careful not to subject the DPU to unnecessary shock or over-
range pressure during operations.
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