18
Table 3-1. Troubleshooting (cont'd)
Problem Possible Source Probable Cause Corrective Action
High
indication
(cont'd)
Indicator,
alarm switch
mechanism
Loose linkage or movement Tighten or replace.
Out of Calibration Calibrate.
Erratic
indication
Primary element Flow pulsating M199 DPU – adjust
dampening;
All o hers – install
dampening device
upstream of DPU run.
Primary element
to DPU piping
Liquid (gas service) or
gas bubble (liquid service)
trapped in piping
Remove.
Vapor generator incorrectly
installed
Re-pipe.
Reference leg gassy or
Liquid vaporizing
See piping instruc ions
in DPU Manual.
Bellows unit
(Refer to DPU
Manual)
Obstructed bellows travel Clean bellows.
Gas trapped in DPU HP or
LP housing
Remove (see Startup
procedure).
Linkage dragging or dirty Adjust or clean.
Pointer dragging on
scaleplate
Adjust pointer posi ion.
Inaccurate or
No Electrical
Alarm
Power supply Blown fuse Replace fuse.
Broken or loose wire Repair.
Alarm switch Switch not properly
adjusted
Adjust switch.
Dirty or burned Replace switch
contacts.
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