Instruction Manual

Slack Tube
®
Manometers
Instructions and Operation
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]
All models have flexible vinyl-plastic columns
and flexible spring steel scale calibrated in
inches of water using water, and inches of
mercury using mercury. Scale is center-
mounted between columns to eliminate parallax
error and has a full 2-inch sliding zero
adjustment.
All Dwyer® Slack Tube
®
Manometers feature
exclusive molded nylon tubing connector
assemblies with rapid shutoff design in an
unbreakable molded top (see picture, page 2).
One turn counter clockwise and the instrument
is ready for use. Another turn seals the tubes
completely. Molded all-nylon construction
makes this assembly corrosion-proof leakproof
and practically unbreakable. Tubing connectors
extend horizontally allowing 360° freedom.
Tubes will not bend or pinch off.
All models have over pressure safety traps in
the top of both columns to prevent loss of fluid
due to over range pressures or surges in
pressure.
Slack Tube
®
Manometers are suitable for total
pressures to 50 psi and vacuum not exceeding
20˝ Hg. (10˝ Hg absolute). Can not be used with
0.826 sp. gr. red gage fluid; use only water or
mercury.
STANDARD ACCESSORIES
Standard Accessories are metal carrying case,
magnetic mounting clips, two rapid shutoff type
molding nylon rubber tubing connectors and one
bottle of fluorescein green color concentrate
with wetting agent. Mercury is not included but
will be furnished at added cost when specified.
OPTIONAL ACCESSORIES
Optional Accessories are available in a wide
range and are in misc. section.
Dwyer
®
Slack Tube
®
Manometers are as accurate
as the finest laboratory “U” gages - yet they are
made to roll up compactly for easy carrying and to
withstand rough usage.
Simply unroll the Dwyer® Slack Tube
®
Manometer
and set up to read static pressure, vacuum, or
differential pressure. Magnetic clips hold it firmly to
any steel surface or hang it on a nail. Turn
connectors one revolution to open. When the
pressure is imposed, add the number of inches one
column travels up to the number of inches the other
column travels down. When reading is completed
turn connectors to seal columns, roll up
manometer into compact coil and tuck it away in its
circular metal case or a tool box. No fluid lost. No
loose caps or inserts to lose.
Dwyer® Slack Tube
®
Manometers cover a wide
range of pressure readings from 4-0-4 inches up to
60-0-60 inches. Use them in determining velocity
and static pressures, for leakage, fan and blower
tests, calibrating control devices, checking gas
pressure and many other applications.
Bulletin D-20
Slack Tube
®
Manometer rolled up for easy handling
and storage.