The maintenance on a manometer would involve which action?

• A. Replace or Add Indicator Liquid
• B. Calibrate the Gauge
• C. Clean the Tube
• D. Replace the Entire Manometer

Answer: (A)

The key idea is that accurate readings on a manometer depend on the indicator liquid being at the proper level and in good condition. Over time, the liquid can evaporate, leak, or become contaminated, which changes its density and how the column responds to pressure. Replacing or adding the indicator liquid restores the correct liquid column and fixes measurement accuracy, making this the appropriate maintenance action. Calibrating the gauge adjusts the scale but doesn’t fix fluid-level or condition issues. Cleaning the tube helps with dirt or blockages but won’t address low or degraded liquid. Replacing the entire manometer is a more drastic step used only when the unit is damaged, not for routine maintenance.