TM 5-6640-212-14
Table 3-8. Manometer Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. NO PRESSURE READING.
Step 1.
Pressure is not being applied to either or both sides of the instrument.
Check for plugged or leaking pressure lines.
Make applicable correction.
Step 2.
Atmospheric pressure connection not vented to atmosphere.
Check atmospheric pressure connection and insure proper venting.
Step 3.
Check for foreign particles in internal passages of the meter blocking the flow.
Remove mercury from meter and check internal passages for foreign particles.
2. HIGH OR LOW PRESSURE READINGS.
Step 1.
Check for leaks or obstructions.
Check lines for leaks or obstructions.
Make applicable corrections.
Step 2.
Tubing and/or mercury may contain foreign matter.
Disassemble and clean instrument. Replace mercury.
Step 3.
Check for improper zero setting.
Check zero setting. Make proper adjustment.
3-29
