Omega Products PX437 Installation Manual
PX437, PX438, PX439
Deep Depth Submersible Pressure Transmitter
INSTRUCTION
SHEET
M2075/1008
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General Description
The OMEGA®PX437, PX438, PX439 Series Pressure
Transmitters can be used in cases where the transmitter is to be submerged. The 4 to 20 rnA output
signal can be transmitted up to 10,000 feet.
Theory of Operation
The transducers incorporate an isolated diaphragm
sensor which is specifically designed for use with
hostile fluids and gases. The sensors utilize a silicon
pressure cell that has been fitted into a stainless steel
package with integral, compliant stainless steel
barrier diaphragm. This sensor assembly is housed
in a rugged 316SS case which proVides for a variety
of pressure ranges. These devices feature internal
signal conditioning, and the output is 4 to 20 mA.
Typical Wiring 4-20mA Configuration
PX430-TRAP Option Attached to Vented Cable
Optional PX430-TRAP Vent Filter/Water Vapor
Trap
The PX430-TRAP is a replaceable vent tube
dehumidifier intended for use with PX430 series
submersible pressure transducers. This device
protects sensitive electronic components from
mildew, corrosion, rust and prevents the formation
of liquid column in the vent tube. Any such column
affects the calibrationThe PX430-TRAP can be
exposed to air, industrial gases, refrigerants, organic
liquids and solvents. It should not be used when
ammonia is present.
The PX430-TRAP connects to the existing vent tube
via a 10" flexible tube (locate the plastic tube near the
two wires on the transducer cable). The acrylic
drying tube is 6" long and the diameter is 3/4".
Inserted in each pull-off molded polypropylene
drying tube end cap is a 20 micron polypropylene
filter.
The drying tube is filled with 30 grams of indicat-ing
desiccant (drying agent). The maximum flow rate
through the drying tube is 300 cubic centime-ters per
minute, more than sufficient flow through to allow
the transducer to respond to barometric changes. As
air passes through the drying tube, moisture is
absorbed by the desiccant. The desi-cant changes
from blue to a rose red as its drying capacity
becomes diminished.
Desiccant can be rejuvenated after normal use by
spreading it in a single layer in a container and
heating for 1 hour at 205°C (400°F).
Drying Transducers
Transducers can be dryed on-site if water has entered
the vent tube. Place coiled cable and transducer in a
container and heat in an oven at 50°C (122°P) for 2
hours. Do not exceed the temperature, or else the
transducer and cable may be damaged.
Bending Cable
Minimum bending radius is 1 inch. Do not crimp the
vent tube inside the cable.
Cable Compression
Compression fittings can be used to secure the
jacketed cable. 15 ft/lb of force is allowable with-out
damaging the cable or crimping the vent tube.
Specifications
Excitation: 9-30 Vdc,
reverse polarity protected
Output: 4-20 mA dc, 2-wire
Input Current: 20 mA max
Insulation Resistance: 100 MΩ at 50 Vde
Proof Pressure: 150%
Burst Pressure: 200%
Wetted Parts: 316 Stainless Steel, and Viton
PX437, PX438, PX439 Series Submersible Pressure Thermometers
Accuracy: PX437: 0.1% FS BFSL
PX438: 0.25% FS BFSL
PX439: 0.5% FS BFSL
(includes linearity, hysteresis, and repeatability)
Response Time: 2 msec.
Zero Offset: ±0.12 mA max
Operating Temperature: 15°F to 140°F (-10°C to 60°C)
Compensated Temperature: 32°F to 120°F (0°C to 50°C)
Fill Fluid: Silicone oil
Combined Thermal Effect: ±0.05% FS/°C
(Zero and Span)
Mounting Provisions: Suspended by cable
Electronic Connections: Submersible cable terminating in
pigtail leads
Cable: Polyurathane jacketed shielded cable
with polyethylene vent tube and Kevlar
tension members. 200 lbs pull strength.
Weight: 7 oz. (198 g.) (cable not included)
Range 0.1% FS Accuracy 0.25% FS Accuracy 0.5% FS Accuracy Cable
PSIG FtH2O Model Model Model Length
0-2 5 PX437-002GI PX438-002GI PX-439-002GI 20 ft.
0-5 11.5 PX437-005GI PX438-005GI PX439-006GI 20 ft.
0-10 23.1 PX437-010GI PX438-010GI PX439-010GI 40 ft.
0-15 34.6 PX437-015GI PX438-015GI PX439-015GI 50 ft.
0-30 69.2 PX437-030GI PX438-030GI PX439-030GI 90 ft.
0-50 115 PX437-050GI PX438-050GI PX439-050GI 135 ft.
0-100 230 PX437-100GI PX438-100GI PX439-100GI 250 ft.
0-150 345 PX437-150GI PX438-150GI PX439-150GI 365 ft.
0-200 460 PX437-200GI PX438-200GI PX439-200GI 480 ft.
0-250 575 PX437-250GI PX438-250GI PX439-250GI 595 ft.
0-300 690 PX437-300GI PX438-300GI PX439-300GI 710 ft.
Available Models
Accessories
Model Description
PX430-TRAP Vent Filter/Water Vapor Trap
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