Installation Instructions for the
PX2 Series Heavy Duty Transducers
Issue 8
50052336
Sensing and Control
CAUTION
PRODUCT DAMAGE
•
Ensure torque specifications are determined for the specific
application. Values provided are for reference only. NPT ports
are not specified with torque values. Correct installation
is based on the number of Turns From Finger Tight (TFFT).
(Mating materials and thread sealants can result in
significantly different torque values from one application to
the next.)
•
When using NPT ports in stainless steel manifolds, use
a thread sealant with anti-seize properties to prevent thread
galling. Ensure the sealant is rated for the application.
•
Use appropriate tools (such as an open ended wrench or
deep well socket) to install transducers.
•
Always hand-start transducers into the hole to prevent cross
threading and damage.
•
Do not subject the transducer to high temperatures from
soldering, brazing, or welding of the system plumbing
Failure to comply with these instructions may result in
product damage.
Ratiometric voltage devices require either a regulated 3.3 Vdc (AA
and AB) or a regulated 5.0 Vdc supply (AC and AD), (see Table 2).
All other versions can use an unregulated supply within the ranges
noted under the excitation specifications. Ensure the power supply
is off while wiring.
ELECTROMAGNETIC ENERGY/NOISE
CAUTION
PRODUCT DAMAGE/ERRATIC OPERATION
• Do not use in areas where electromagnetic energy may affect
transducer operation.
Failure to comply with these instructions may result in
product damage.
The PX2 Series has been rated for high immunity to electrical
noise; however, care should be taken when used around high
voltage sources that emit high levels of radiated electromagnetic
energy like variable frequency motor drives, solenoids, radio
transmitters and engine ignition systems. The use of shielded
cable and grounding of pressure port is also recommended.
FUNCTIONAL TEST
1. Connect the transducer to a dc voltage supply (off). The supply
voltage should be set within the range specified for the model.
2. Based on the transducer’s specified output, connect the output
lead(s) to a digital dc or mA meter.
3. With no pressure on the transducer, turn on the power supply
and read the output signal on the voltmeter. The reading
should correspond to the specification indicated for null offset.
If not, check the connections, wire color code and the setting
of the power supply.
GENERAL INFORMATION
Honeywell’s PX2 Series Heavy Duty Pressure Transducer is
a portfolio of highly configurable pressure sensors that use
piezoresistive sensing technology with ASIC (Application Specific
Integrated Circuit) signal conditioning in a stainless steel housing.
The PX2 Series is fully calibrated and compensated for offset,
sensitivity, temperature effects and non-linearity using the on-
board ASIC.
OVERPRESSURE
CAUTION
PRODUCT DAMAGE
•
Do not exceed the overpressure.
Failure to comply with these instructions may result in
product damage.
If the overpressure rating is exceeded, the life of the PX2 Series
may be reduced and electrical failure may occur. Both static
and dynamic overpressure must be considered, particularly in
hydraulic system applications. Hydraulic pressure fluctuations
can have very high and very fast peak pressures, as in a water
hammer effect.
An oscilloscope is recommended for determining if high-pressure
transients exist in a system. If system pressure pulses are
expected, choose a transducer with a pressure rating high enough
to allow continuous operation at the highest expected pressure
spikes.
A pressure ‘snubber’ may be used to reduce the peak pressure
applied to the transducer.
MEDIA COMPATIBILTY
CAUTION
PRODUCT DAMAGE
•
Use non-abrasive, chemically compatible media to prevent
damage to diaphragm or port materials.
Failure to comply with these instructions may result in
product damage.
The PX2 Series fluid path is an assembly of 304 stainless steel,
epoxy, alumina, glass, and silicon.
•
INSTALLATION
Table 1. Compatible Media
Refrigerants
Other Media
R410A
R134A
R123ZE
mixture of R245Fa and transdichloroethylene
engine oil 10W30
brake fluid DOT3
hydraulic fluid
tap water
compressed air
