PX654

Supported Applications

The Omega PX654 series comprises bidirectional, differential pressure transmitters designed for low-pressure industrial measurement. The product overview identifies ideal applications including boiler inlet air systems, HVAC environments, industrial fume hoods, and level control.

Sensors are specified for use with dry, clean, non-corrosive gases only.

Operating Conditions & Performance

The PX654 series utilizes capacitance sensor technology. Key performance specifications include:

• Accuracy: 0.3% full scale (BFSL) linearity, with hysteresis of 0.02% full scale and repeatability of 0.05% full scale.
• Response Time: 250 ms.
• Operating Temperature: -29 to 85°C (-20 to 185°F).
• Compensated Temperature: -18 to 72°C (35 to 160°F).
• Thermal Effects: Zero and Span drift of 0.015% full scale/°F.

The series supports a wide range of differential pressure spans, from low-pressure ranges such as 0 to 0.1 inH₂O (0 to 25 Pa) up to 0 to 200 inH₂O (0 to 49.8k Pa). Bidirectional options are available for ±0.05 inH₂O through ±100 inH₂O.

Pressure limits include a proof pressure of 10 psi, burst pressure of 50 psi, and static pressure rating of 100 psi.

Configuration Options

The PX654 series is configured for specific measurement ranges and output requirements. The following capabilities are documented across the family:

• Housing & Enclosure: NEMA 4X (IP65) rated enclosure.
• Process Connection: ¼ FNPT pressure port.
• Electrical Connections: Screw terminal with two ½ FNPT conduit entries.
• Power Supply & Excitation: 12 to 36 Vdc (Supply current <5 mA).
• Output Signals:
  • Voltage output: 1 to 5 Vdc (PX654 models).
  • Analog current output: 4-20 mA, 2-wire configuration (associated with PX656/PX657 variants in the family manual context).
• Calibration: NIST traceable calibration provided at 25%, 50%, 75%, and 100% full scale (upscale and downscale).

The series includes a one-year warranty. Wetted parts are compatible with dry, clean, non-corrosive gases only.

Key Product Differences

Variants within the PX654 family differ primarily by pressure range and output signal type:

• PX654 Models (Voltage Output): Provide a 1 to 5 Vdc analog voltage output. Model numbers follow the format PX654-D5V, where ranges include unidirectional spans (e.g., PX654-01D5V for 0 to 1 inH₂O) and bidirectional spans (e.g., PX654-2.5BD5V for ±2.5 psi differential pressure range).
• PX656/PX657 Models (Current Output): While the primary data sheet focuses on voltage output, family documentation indicates variants with 4-20 mA (2-wire) outputs exist within this product grouping.

The series offers extensive range options in both inches of water column and Pascals to accommodate specific low-pressure differential requirements. Compatible meters listed for these transmitters include DP25B-E, DP41-E, and DP460-E models.