Omega Products PX921-010GI User Manual

B-153

Comes with complete operator‘s manual.
Metric Ranges Available - Consult Engineering

Ordering Example: PX921-1KGI, 1000 psi transducer, 4 to 20 mA output, PG9 cable gland
and internal terminal block electrical connection with 1⁄2Male NPT pressure port, and PX921-R,
receiver/retransmitter, $1095 + 875 = $1970.

$

1095

All Models

⻬ Silicon-on-Sapphire

Sensor Assures
High Stability and
Repeatability

⻬ Low Power Radio

Transmitter Built-in with
Range of 152 m (500')

⻬ High Accuracy 12 bit
⻬ No License is Required
⻬ IP65/NEMA 4 Stainless

Steel Body

⻬ Solid State Reliability
⻬ High Shock and Vibration

Typical Applications
⻬ Mechanical and Civil

Engineering Projects

⻬ Process Plants
⻬ Production Test Facilities
⻬ Water Resource

Management

⻬ Power Generation

PX921 Series

4-20 mA Output
0-5 to 0-15,000 psi
0-0.5 to 0-1000 bar

WIRELESS TRANSMITTER
SILICON-ON-SAPPHIRE

LONG TERM RELIABILITY

PX921-100GI,
$1095. shown
smaller than
actual size.

To Order

(Specify Model Number)

RANGE (psig) MODEL NO. PRICE COMPATIBLE METERS

30 inHg to 0 PX921-30VACI $1095 DP41-E, DP25-E, DP24-E
0 to 5 PX921-005GI 1095 DP41-E, DP25-E, DP24-E
0 to 10 PX921-010GI 1095 DP41-E, DP25-E, DP24-E
0 to 15 PX921-015GI 1095 DP41-E, DP25-E, DP24-E
0 to 30 PX921-030GI 1095 DP41-E, DP25-E, DP24-E
0 to 60 PX921-060GI 1095 DP41-E, DP25-E, DP24-E
0 to 100 PX921-100GI 1095 DP41-E, DP25-E, DP24-E
0 to 150 PX921-150GI 1095 DP41-E, DP25-E, DP24-E
0 to 200 PX921-200GI 1095 DP41-E, DP25-E, DP24-E
0 to 300 PX921-300GI 1095 DP41-E, DP25-E, DP24-E
0 to 600 PX921-600GI 1095 DP41-E, DP25-E, DP24-E
0 to 1K PX921-1KGI 1095 DP41-E, DP25-E, DP24-E
0 to 1.5K PX921-1.5KGI 1095 DP41-E, DP25-E, DP24-E
0 to 3K PX921-3KGI 1095 DP41-E, DP25-E, DP24-E
0 to 6K PX921-6KGI 1095 DP41-E, DP25-E, DP24-E
0 to 10K PX921-10KGI 1095 DP41-E, DP25-E, DP24-E
0 to 15K PX921-15KGI 1095 DP41-E, DP25-E, DP24-E

OMEGA’s PX921 Series wireless
transmitters are designed for safe
operation in tough industrial
installation—without the need for
hard wiring! The PX921 operates by
radio telemetry. A low power RF
transmitter safely transmits the
signal up to 152 m (500') to a
receiver / retransmitter where it is
converted into a 4 to 20 mA signal.

Rugged stainless steel constructed
and featuring S.O.S. technology
with a custom IC amplifier give the
PX921 series high stability, low drift
and long life.

SOS construction uses very stable
solid state silicon strain gages on a
Sapphire carrier which is glass
bonded to a titanium diaphragm. This
combination provides a very durable

transducer which
has excellent
stability over a wide
temperature range.
Additionally, the
titanium diaphragm
and Stainless Steel
wetted parts provide
maximum durability
and corrosion
resistance to harsh
industrial chemicals.

To Order

(Specify Model No.)

MODEL PRICE DESCRIPTION

PX921-R $875 Receiver/
(Required) retransmitter

Required Accessory

To Order

(Specify Model No.)

MODEL PRICE DESCRIPTION

OP-6 $340 Reference Book:

Fundamentals of
Temperature,
Pressure and Air
Flow Measurement

Accessory

CUSTOM BUILT TO ORDER

B

SPECIALTY

PRESSURE TRANSDUCERS

B-154

SPECIFICATIONS

(PX921 TRANSDUCER)

Excitation:

Internal Battery: 10.5 to 15 Vdc (not supplied)
External Supply: 10.5 to 30 Vdc

Output:

Local Test Voltage: 0.5 to 2.0 Vdc FS
Data Transmission: Serial bit stream
Data Speed: 4800/9600 baud

Accuracy:

Resolution: 12 bit ADC
Linearity and Hysteresis: 0.3%

Sensing Element: 4 active-arm bridge using
Silicon-on Sapphire thin-film elements

Operating Temp Range:

-20° to 80°C (-4° to 176°F)

Compensated Temp Range:

0° to 80°C (32° to 176°F)

Thermal Effects:

(Over the compensated range)

Span: ±0.03% FS/°C
Zero: ±0.02% FS/°C
Proof Pressure:

1.5 times rated pressure will not cause changes
in performance beyond the specified tolerance

Wetted Parts:

17-4 PH and 304 Stainless Steel and
Titanium Diaphragm

Body: 300 Series Stainless Steel, sealed to
IP65 (NEMA 4)

Electrical Connection:

Internal Screw Terminals via gland

Pressure Port:

1

⁄2 NPT Male

Weight: 1.2 kg (2.65 lb) maximum

(PX921 RECEIVER)

Input:

Data Transmission: Serial bit stream from PX921
Data Speed: 4800/9600 baud

Output:

Analog: 4 to 20 mA dc
Load Driving: 1500Ω maximum

Accuracy:

Resolution: 12 bit DAC
Linearity and Hysteresis: ±0.3% FS

Body: Polycarbonate enclosure sealed to IP65 (NEMA 4X)
Excitation: 10.5 to 30 Vdc
UHF Radio Transmitter/Receiver:

Carrier Frequency: 418 mHz
Modulation Type: FM

OPERATION:

The PX921 pressure transmitter converts pressure
measurements to a digital code which is processes by the
onboard microcontroller. The microcontroller generates a
coded data frame in accordance with the protocol. This frame
is then transmitted by UHF to the PX921-R where it is
decoded, validated and converted to an analog 4 to 20 mA
signal. This signal can then be transmitted and interface with
all standard 20 mA loop instruments.

DATA TRANSMISSION:

Data is transmitted as a bit stream data frame using
asynchronous protocol. a random delay between
transmissions minimizes collisions between adjacent streams.
Data error detection is employed to allow error free operation
in high interference environments. Indication of receipt of
uncorrupted data is provided on the PX921-R unit.

RADIO LICENSE:

No license is required with this equipment.
Data transmission is via a radio transmitter operating at a
designated low power UHF telemetry frequency. It operates in
the 418 MHz region @ 0.25 mW.

INSTALLATION:

The PX921 is simple to install and does not require additional
configuration tools. Once the PX921 has been connected to
the process fitting, configuration is easily carried out by setting
a series of miniature switches which are under the cover of
the transducer. At this stage it is possible to check the
calibration of the unit locally by measuring the voltage across
tow test points, which can then be adjusted with the zero and
span trimmers if required.

POWER SUPPLY

Units may be powered by either an internal battery (10.5 to
15 Vdc) or by an external supply voltage (10.5 to 30 Vdc). In
battery mode, a duty cycle power saving system is employed
to extend battery life.

WIRELESS TRANSMITTER
SILICON-ON SAPPHIRE TECHNOLOGY

PX921 TRANSMITTER

DIMENSIONS: mm (inches)

120

(4.728)

200

(7.88)

75

(2.955)

60

(2.364)

ANTENNA

SCREW CAP FOR EASE OF
ACCESS FOR ZERO + SPAN
ADJUSTMENTS

418MHz FM TRANSMITTER

ROBUST STAINLESS STEEL
HOUSING TO IP65

STATE OF THE ART ANALOG
AND DIGITAL ELECTRONICS

LATEST SILICON ON SAPPHIRE
SENSOR DIAPHRAGM TECHNOLOGY

1/2'' NPTM

FIXING CENTERS

188 (7) X 89 (3.5)

CABLE
GLAND

136

(5.3584)

20

(0.788)

PX921 RECEIVER