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Wireless Pressure Transmitter Silicon-on-Sapphire- Long Term Reliability
TRODEKS Engineering | Thermocouples, Pressure Transducers, Flow Meters, PID Controllers
  • Silicon-on-Sapphire Sensor Assures High Stability and Repeatability
  • Low Power Radio 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
 Manuals (contact with email : [email protected])


trodeks’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 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 pressuremeasurements to a digital code which is processes by theonboard microcontroller. The microcontroller generates acoded data frame in accordance with the protocol. This frameis then transmitted by UHF to the PX921-R where it isdecoded, validated and converted to an analog 4 to 20 mAsignal. This signal can then be transmitted and interface withall standard 20 mA loop instruments.

Data is transmitted as a bit stream data frame usingasynchronous protocol. a random delay betweentransmissions minimizes collisions between adjacent streams.Data error detection is employed to allow error free operationin high interference environments. Indication of receipt ofuncorrupted data is provided on the PX921-R unit.

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

The PX921 is simple to install and does not require additionalconfiguration tools. Once the PX921 has been connected tothe process fitting, configuration is easily carried out by settinga series of miniature switches which are under the cover ofthe transducer. At this stage it is possible to check thecalibration of the unit locally by measuring the voltage acrosstow test points, which can then be adjusted with the zero andspan trimmers if required.

POWER SUPPLYUnits may be powered by either an internal battery (10.5 to15 Vdc) or by an external supply voltage (10.5 to 30 Vdc). Inbattery mode, a duty cycle power saving system is employedto extend battery life.
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