Xylem H-3551 - Manual (Page 18)

4-2 Maintenance
H-3551
4.3 Bubble Test
When visiting a gauge station it is recommended to always take a bucket and a length of rubber
tubing. With the rubber tubing you can disconnect the station’s orifice line and direct the gas flow
into a bucket of water. This fast and productive test allows you to check for proper bubbling, leaks
and other problems. Realize however, if the H-3551 was bubbling into deep water, when you
direct the gas flow to a shallow bucket the bubble rate will be abnormally high for 5-10 minutes
until the H-3551 can adjust to the new water depth.
It is also recommended to have dish detergent, a small paintbrush or “snoop” in your toolbox for
testing for air leaks. Again, at 60 bubbles/minute, even a tiny leak will allow the entire gas flow to
escape to the atmosphere.