Badger Meter Hydrometer - Manual (Page 6)

Section 1
Paragraphs 1-22 to 1-29
flowmeter and is designed to burst at a pressure lower than the
bursting pressure of the largest tube. The disc is rated to burst
at 85 psi.
r 5 psi. This provides a bypass through which the
flow may be returned to the supply tank.
1-22. LIGHTS. Depending on size and number of stages
used, flowmeters can be equipped with explosion proof or
non-explosion proof fluorescent lights mounted behind the
tubes.
1-23. AIR CYLINDERS. Flowmeters can be equipped with
air cylinders to operate the bypass valves. Different cylinder
assemblies are used for 1-1/4 and 2-inch valves.
1-24. SPECIFICATIONS.
1-25. CAPACITY. Cox Variable Area Flowmeters Bulletin
CA 6001 provides information on the range and capacity for
all standard combinations of Series 12 Flowmeters.
1-26. MOUNTING DIMENSIONS. Cox Variable Area
Flowmeter Bulletin CA 6001 provides information on
mounting dimensions for all standard Series 12 Flowmeters.
1-27. PREPARATION FOR USE.
1-28. UNPACKING. Unpack instrument carefully. Parts of
this flowmeter are fragile and can be easily damaged. Check
all parts against packing slip to be sure that none are
discarded. Floats, 0.375-inch and larger, are packed
separately in a small container. Handle floats carefully.
Floats are fitted to the tubes with extreme accuracy and the
slightest damage may make them useless. Replace them in
original containers after checking until ready for their
installation.
1-29. INSTALLATION (fig. 6).
a. Flowmeter should be mounted in a vertical position and as
free from vibration as possible. The maximum allowable
position is approximately 5
q off the center vertical centerline.
A position greater than 5 q would tend to introduce about a 1 to
2% error in accuracy. Install special mounting stud (longer
threaded portion first) into holes drilled in customer’s panel.
Secure in place with lockwasher and standard hex nut. Install
meter shell onto studs and secure in place with special nut
with shoulder toward panel.
b. Clean inside of instrument thoroughly. Wipe reflector with
a clean cloth. The red index line on scale must align with red
mark on tube. Loosen set screws holding scale support posts
in packing glands and adjust scales if necessary. Install bezel
with window on front of shell by engaging clips on inside of
bezel in special mounting studs.
c. To avoid strain and transmitting vibration to flowmeter,
flexible hoses or lines should be installed between flowmeter
and service lines. If inlet and outlet unions cannot be
separated by the fingers, use two wrenches. All tubing joints
are soft soldered and strain on them should be avoided. With
suitable adaptor, connect flexible lines to unions and service
piping. Use two wrenches to tighten. A shut-off valve should
be installed in discharge line beyond the flexible connection.
This will prevent possible drainage of the instrument when
device being checked is disconnected. When furnished, install
pressure blowout disc assembly in inlet line to flowmeter.
d. A 25 micron filter should be installed on the inlet side of
the flowmeter. This will keep the flowmeter clean and keep
floats from sticking and collecting dirt. Collecting dirt adds
weight to the float which in turn changes flow rate reading.
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