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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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