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Idiomas disponibles
Idiomas disponibles
OVERPRESSURE PROTECTION: Standard
Magnehelic® Differential Pressure Gages
are rated for a maximum pressure of 15 psig
and should not be used where that limit could
be exceeded. Models employ a rubber plug
on the rear which functions as a relief valve by
unseating and venting the gage interior when
over pressure reaches approximately 25 psig
(excludes MP and HP models). To provide a
free path for pressure relief, there are four
spacer pads which maintain .023˝ clearance
when gage is surface mounted. Do not
obstruct the gap created by these pads.
INSTALLATION
Select a location free from excessive vibration
and where the ambient temperature will not
exceed 140°F (60°C). Also, avoid direct
sunlight which accelerates discoloration of the
clear plastic cover. Sensing lines may be run
any necessary distance. Long tubing lengths
will not affect accuracy but will increase
response time slightly. Do not restrict lines. If
pulsating pressures or vibration cause
excessive pointer oscillation, consult the
factory for ways to provide additional
damping.
All
standard
Magnehelic®
Pressure Gages are calibrated with the
diaphragm vertical and should be used in that
position for maximum accuracy. If gages are
to be used in other than vertical position, this
should be specified on the order. Many higher
range gages will perform within tolerance in
other positions with only rezeroing. Low range
models of 0.5" w.c. plus 0.25" w.c. and metric
equivalents must be used in the vertical
position only.
SURFACE MOUNTING
Locate mounting holes, 120° apart on a 4-
1/8" dia. circle. Use No. 6-32 machine screws
of appropriate length.
MAGNEHELIC
Differential
®
INSTALLATION
FLUSH MOUNTING
Provide a 4-9/16" dia. (116 mm) opening in
panel. Provide a 4-3/4" dia. (120 mm)
opening for MP and HP models. Insert gage
and secure in place with No. 6-32 machine
screws of appropriate length, with adapters,
firmly secured in place.
PIPE MOUNTING
To mount gage on 1-1/4" - 2" pipe, order
optional A-610 pipe mounting kit.
TO ZERO GAGE AFTER INSTALLATION
Set the indicating pointer exactly on the zero
mark, using the external zero adjust screw on
the cover at the bottom. Note that the zero
check or adjustment can only be made with
the high and low pressure taps both open to
atmosphere.
OPERATION
Positive Pressure: Connect tubing from
source of pressure to either of the two high
pressure ports. Plug the port not used. Vent
one
or
both
atmosphere.
Negative Pressure: Connect tubing from
source of vacuum or negative pressure to
either of the two low pressure ports. Plug the
port not used. Vent one or both high pressure
ports to atmosphere.
Differential Pressure: Connect tubing from
the greater of two pressure sources to either
high pressure port and the lower to either low
pressure port. Plug both unused ports.
When one side of the gage is vented in dirty,
dusty atmosphere, we suggest an A-331
Filter Vent Plug be installed in the open port to
keep inside of gage clean.
A. For portable use of temporary installation
use 1/8" pipe thread to rubber tubing adapter
and connect to source of pressure with
flexible rubber or vinyl tubing.
B. For permanent installation, 1/4" O.D., or
larger, copper or aluminum tubing is
recommended.
low
pressure
ports
to
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