PX663

Supported Applications

The Omega PX663/665 series consists of DIN rail-mountable differential pressure transmitters designed for low-pressure measurements. These units utilize a variable capacitance sensor to measure clean, dry, and non-corrosive gases. The product overview explicitly states the series is not for use with liquids.

Key application features include:

• DIN rail mounting in enclosure applications (compatible with EN50022, EN50035, & EN50045 rails).
• Front-accessible test jacks for on-line process reference signal or calibration without disconnecting power supply wiring.
• Included process valve actuator tool and 7" of silicon tubing for validation tasks.

Operating Conditions & Performance

The PX663/665 series operates within an ambient temperature range of -28 to 82°C (-20 to 180°F) with a humidity rating of 10 to 95% RH non-condensing. Storage temperatures are rated from -40 to 82°C (-40 to 180°F). The units feature an on-board voltage regulation system powered by an unregulated supply voltage from 12-36 Vdc.

Performance specifications include:

• Accuracy: ±0.5% FS
• Hysteresis: ±0.02% full scale
• Repeatability (Non-Repeatability): ±0.05%
• Response Time: 250 ms
• Warm-Up Time: 5 sec maximum to meet standard specifications from initial power-up.
• Stability: Maximum change (full scale/year) ±0.5%
• Thermal Coefficients - Zero & Span: ±0.036% full scale/°C (±0.02% full scale/°F)

The series supports pressure ranges from 0 to 50 inH2O (125 mbar) for uni-directional measurements and bi-directional ranges up to ±25 inH2O (±62.3 mbar). Overpressure limits are defined as a Proof limit of 15 psid and a Burst pressure of 25 psi, with a Maximum Static Pressure rating of 25 psi.

Configuration Options

The series is configured across two primary model families distinguished by output signal type. The PX663 family provides a 1 to 5 Vdc voltage output (3-wire connection), while the PX665 family delivers a 4-20 mA current output (2-wire connection). Both variants share identical measurement ranges, accuracy, and environmental ratings.

Configuration options include:

• Measurement Ranges: Uni-directional from 0 to 0.10 inH2O up to 0 to 50.00 inH2O; Bi-directional from ±0.05 inH2O up to ±25.00 inH2O.
• Process Connections: ¼ NPT female ports on both high and low sides (implied by differential nature).
• Housing Material: Glass-filled polycarbonate (UL94-V-1).
• Adjustments: Front-accessible, non-interactive zero and span potentiometers. Zero adjustment range is ±5% full scale; Span adjustment range is ±3% full scale.
• Electrical Connections: Screw terminals for power supply (+), power supply (-), and output signal (voltage) or sense resistor (current).

The PX663/665 series includes a calibration kit with the actuator tool and tubing, test jacks, and an operator's manual. Custom configurations are available upon consultation.

Key Product Differences

The primary distinction between models in this bundle is the output signal type and corresponding wiring configuration:

• PX663 Series (Voltage Output): Provides a 1 to 5 Vdc linear analog output. Requires a 3-wire connection: POWER SUPPLY (+), POWER SUPPLY (-), and OUTPUT SIGNAL.
• PX665 Series (Current Output): Provides a 4-20 mA linear analog output. Utilizes a 2-wire loop configuration where the power supply is shared with the signal line, requiring an external sense resistor ($R_S$) in some configurations.

Model numbers follow specific patterns indicating range and directionality (e.g., PX663-0.1D5V for 0 to 0.10 inH2O uni-directional voltage output; PX665-0.1BDI for ±0.10 inH2O bi-directional current output). The series is CE compliant to EN61326: 1997 ANNEX A harmonized heavy industrial transmitter specification and carries a 3-year warranty.