7
Table 4-5. Troubleshooting Chart (Continued)
High Primary Orice partially restricted Clean out or replace
Indication or too small
Piping from Leak in LP side piping Repair leaks
Primary Element
to DPU
Bellows Unit Gas trapped (liquid service)
in LP housing or liquid
trapped (gas service) in HP
housin
g
Vent housing
LP housing gasket leaks Replace gasket
Range spring broken or Return BUA for
DPU tampered with repair
Mechanism Loose links or movements Repair or replace
Out of calibration Calibrate
Erratic Primary Flow pulsating Install dampening
Indication device upstream of
DPU run
Piping from Liquid trapped in gas Remove (see Startup
Primary Element piping or gas bubble in Procedure-Section 3)
to DPU liquid piping
Vapor generator incorrectly Repipe
installed
Reference leg gassy or See piping instruc-
liquid vaporizing tions
Bellows Unit Obstructed bellows travel Clean bellows
Gas trapped in DPU HP or Remove (see Startup
LP housing Procedure-Section 3)
Mechanism Linkage dragging or dirty Adjust or clean
Pointer dragging on scale Adjust
plate
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