PXM309

Supported Applications

The Omega PXM309 series comprises metric, general-purpose pressure transducers designed for multimedia compatibility. These stainless steel units utilize high-performance silicon technology to measure Absolute Pressure, Gage (Relative) Pressure, and Vacuum and Compound Gage Pressure.

• Absolute Pressure: 350 mbar to 20 bar
• Gage (Relative) Pressure: 70 mbar to 700 bar
• Vacuum and Compound Gage Pressure: Ranges including -1 to +1 bar, -1 to +2 bar, up to -1 to +10 bar

Operating Conditions & Performance

The series operates within an ambient and process temperature range of -40 to 85°C (-40 to 185°F). Static accuracy is specified as ±0.25% FS BSL at 25°C, which includes linearity, hysteresis, and repeatability. Long-term stability over one year is rated at ±0.25% FS.

Total Error Band varies by range: ±4.5% gage for 70 mB; ±3% gage for 140 mB; ±1.5% gage and absolute for 350 mB; ±1% absolute for 1 to 20 bar; and ±1% gage for 1 to 700 bar.

• Response Time: 1 mS
• Bandwidth: DC to 1 kHz type
• Pressure Cycles: 1 x 10⁷ full scale cycles
• Shock Rating: 50 g 11 mSec half sine shock
• Vibration Rating: ± 20 g

Overload and Burst Limits

Pressure overload limits depend on the specific range:

• 70 mB to 3.5 bar Gage: 3 x rated pressure or 1.38 bar whichever is greater.
• 350 mB to 20 bar Absolute: 3 x rated pressure or 1.38 bar whichever is greater.
• 7 to 700 bar Gage: 2 x rated pressure.

Burst pressure limits are defined as:

• 70 mB to 3.5 bar Gage and 350 mB to 20 bar Absolute: 5 x rated pressure or 1.72 bar whichever is greater.
• 7 to 700 bar Gage: 5 x rated power.

Configuration Options

The PXM309 series offers three distinct electrical connection configurations, identified by model prefixes:

• PXM309 Series (Cable): Features a 1.5 m (5') cable with 2 or 3 conductors depending on output.
• PXM319 Series (mini DIN): Equipped with a mini DIN connector; mating connector included.
• PXM359 Series (M12 Connector): Utilizes an M12 4-pin connector. Note: For gage units below 70 bar, vented cable options are required for PXM359 models.

Output and Power

Selectable output signals include:

• 0 to 10 Vdc Output: Requires supply voltage of 15 to 30 Vdc at 10 mA.
• 4 to 20 mA Output: Requires supply voltage of 9 to 30 Vdc.

The units feature reverse polarity and over-voltage protection. Isolation from body to any lead is rated at 1 M Ω at 25 Vdc.

Materials and Construction

Housing material is Stainless Steel with an IP65 Environmental Rating. The process connection is a G ¼ Male Pressure Fitting. Wetted parts materials vary by range:

• 70 mB to 3.5 bar Gage: 316 SS.
• 350 mB to 20 bar Absolute: 316 SS.
• 7 to 700 bar Gage: 17-4PH SS.

Note that units in the 0 to 35 bar range may contain an HNBR o-ring in the wetted pressure port assembly. A sealing washer for G 1/4, stainless steel with FKM seal (PXMW-4) is included.

Key Product Differences

The series encompasses three model families distinguished by their electrical termination method:

• PXM309: Cable models with flying leads.
• PXM319: mini DIN connector models.
• PXM359: M12 4-pin connector models.

Model numbers follow the format PXM[Series]--, where output is designated as '10V' for 0 to 10 Vdc or 'I' for 4 to 20 mA. Pressure type suffixes include A (Absolute), G (Gage), V (Vacuum), and CG (Compound Gage). Each unit ships with a 5-point traceable calibration certificate.