Wireless Pressure Transmitter
Silicon-on-Sapphire, Long Term Reliability


Wireless Transmitter Silicon-on-Sapphire, Long Term Reliability | PX921

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  • Silicon-on-Sapphire Sensor Assures High Stability and Repeatability
  • Low Power Radio Wireless Transmitter Built-in with Range up to 500 Feet
  • High Accuracy 12 bit
  • No License is Required
  • IP65/NEMA 4 Stainless Steel Body
  • Solid State Reliability
  • High Shock and Vibration
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OMEGA’s PX921 Series Wireless Transmitters & Receivers System is 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 500 feet to a receiver / retransmitter where it is converted into a 4-20 mA signal. Rugged stainless steel construction 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.

    Internal Battery: 10.5 to 15 Vdc (not supplied)
    External Supply: 10.5 to 30 Vdc
    Local Test Voltage: 0.5 to 2.0 Vdc FS
    Data Transmission: Serial bit stream
    Data Speed: 4800/9600 baud
    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: ½ NPT Male
Weight: 1.2 kg (2.65 lb) maximum
    Data Transmission: Serial bit stream from PX921
    Data Speed: 4800/9600 baud
    Analog: 4 to 20 mA dc
    Load Driving: 1500Ω maximum
    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

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 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.

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.

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.
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