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INSTALLATION (See Figure 1)
MOUNTING:
The No. 84370-Series Pressure Sensor may be
mounted in any position, although vertical (upright)
is recommended. It should be securely mounted on
the panel or other suitable surface to prevent
excessive vibration using the two 7/32" (5.53 mm)
diameter holes in the housing assembly. A 1/8" - 27
NPT female process connection is provided for this
type of mounting. The sensor also has a 1/2" - 14
NPT connection for manifold mounting.
CAUTION: When installing the manifold-
mounted sensor, screw into pipe or vessel
using the wrench flats only. Turning by the
housing will cause permanent damage to the
sensor.
If the measured variable is a liquid, consideration
should be given to the level of the liquid. Since an
error in calibration could be caused by the weight of a
body of liquid acting on the measuring assembly, it
might be necessary to adjust the calibration to
compensate
for
the
ADJUSTMENTS).
If the sensor is out of doors or in any way
exposed to water during cleaning, etc., it should be
mounted in a position that will prevent water entry
into the valve or spring housings. Water trapped in
the housing will impair operation and could freeze
during winter months. Vent openings should have
fittings installed turned down. The 1/8" - 27 NPT
connection can be used for piped vent operation if
gas is used.
constant
weight
(see
(With Automatic Reset)
Figure 1
Direct-Acting Shown
CONNECTIONS:
The sensor has three 1/8" - 27 NPT connections -
one for control pressure, one for vent pressure, and
one for case relief pressure.
CAUTION: Do not pipe or plug case relief
connection. The vent pressure connection
from the sensor cannot be used as a supply
or control source for any other equipment.
Vent backpressure should be held to as low a
level as possible.
The control port pressure must be provided thru a
.032" (.81 mm) diameter or smaller orifice using 1/4"
(6.35 mm) or 3/8" (9.53 mm) O.D. tubing not
exceeding 100 feet (30.5 m) in length. Using
excessive lengths or other than the specified tubing is
not recommended.
Tubing and fittings used to connect the sensor
must be free of chips, dirt, moisture or other foreign
matter.
It is recommended that a non-hardening, "anti-
seize" type thread compound be applied to the second
or third male thread in moderate amount. Do not
allow any compound to be deposited inside the
sensor. Thread sealing tape is not recommended.
If the sensor is used with a liquid process
pressure, entrapped air in the tubing connected to the
measuring assembly should be vented. This can be
accomplished by bleeding the fitting connection
installed at the sensing element.
3
(With Manual Reset)
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