Ametek 303B, User Manual

Page: 38 / 70

3-10 | 303B Moisture Analyzer Manual
System Installation Bubble-O Meter
1. Wet the entire inside of the bubble-o-meter (tube) with a dilute liquid
detergent or shampoo solution through the top of the tube.
2. Tilt the tube sideways and turn it to wet the entire inside surface.
3. Hold the tube upright and check that the liquid level in the rubber bulb
is slightly below the Y arm. If level is too high, bubbles will flow without
squeezing the bulb. Pour out some of the liquid if this happens.
4. Connect the bottom Y inlet port to a gas source with rubber or plastic
tubing.
5. Measure the gas flow rate by carefully squeezing the bulb to form a
single bubble and, with a stopwatch, timing its transit time between two
adjacent calibration marks.
When making precision measurements, use the gas law equations to correct for ambient
temperature and vapor pressure, and water tension above the soap solution; be sure to
add distilled water occasionally to compensate for evaporation.
When making measurements at low flow rates with gases like helium or hydrogen, form
several films ahead of the one being timed to prevent gas loss by diffusion through the film.
!
WARNING
!
WARNING