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INSTALLATION
Mounting:
The No. 84374-Series Pressure Sensor may be mounted
in
any
position,
although
recommended. It should be securely mounted on the panel
using mounting bracket to prevent excessive vibration.
If the measured variable is a liquid, consideration should
be given to the liquid level. An error in calibration could be
caused by the weight of a body of liquid acting on the
measuring assembly. It may be necessary to adjust
calibration to compensate for the constant weight (See
ADJUSTMENTS).
If the sensor is out of doors or in any way exposed to
water, 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 vent
connection can be used for piped vent operation if gas is
used.
If the sensor is used with a liquid process pressure,
entrapped air in tubing connected to the measuring
assembly should be vented. This can be accomplished by
bleeding the connection at the sensing element.
DIMENSIONS - Millimeters (Inches)
vertical
(upright)
is
Figure 1
Direct Acting Shown
3
Connections:
1. The sensor has three 1/8"-27 NPT connections-one for
control pressure, one for vent pressure and one for case
relief pressure. A 1/4"-18 NPT connection is provided for
the process pressure.
CAUTION: Do not pipe
connection. The vent pressure connection from
the sensor cannot be used as a supply or control
source
for
any
backpressure should be held to as low a level as
possible.
Control port pressure must be provided through a .8 mm
(.032") diameter or smaller orifice using 6 mm (1/4") or 9.5
mm (3/8") O.D. tubing. 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.
On fittings, it is recommended that a non-hardening,
"anti-seize" type thread compound be applied to the threads
in moderate amount. The first thread should then be wiped
of excess to avoid compound being deposited inside the
relay. Thread sealing tape is not recommended.
or
plug case relief
other
equipment.
Vent
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