What position must the flow meter be put in for accurate readings?

What position must the flow meter be put in for accurate readings?

• A. Vertical
• B. Horizontal
• C. Inclined
• D. Any position

Answer: (A)

Flow meters like rotameters measure flow by letting a float rise in a tapered tube until the upward drag from the flowing gas or liquid balances the float’s weight and buoyancy. This balance happens most reliably when the meter is vertical, so the float’s position along the tube directly corresponds to the actual flow rate. If the meter is horizontal or inclined, gravity affects the float differently, shifting its position and giving an incorrect reading. Keeping the meter vertical ensures the forces are aligned correctly and the reading is accurate.

Flow meters like rotameters measure flow by letting a float rise in a tapered tube until the upward drag from the flowing gas or liquid balances the float’s weight and buoyancy. This balance happens most reliably when the meter is vertical, so the float’s position along the tube directly corresponds to the actual flow rate. If the meter is horizontal or inclined, gravity affects the float differently, shifting its position and giving an incorrect reading. Keeping the meter vertical ensures the forces are aligned correctly and the reading is accurate.