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PX276
Duct Pressure Transmitters with Selectable Ranges & NEMA 4 Case
- Duct pressure transducer and static pressure probe integrated as one unit
- Up to 3 field selectable ranges in a single unit
- Rugged NEMA-4 enclosure with external mounting bracket
- Short circuit and reverse polarity protected
Product Overview
- Accuracy Detail ± 1.0% FS
- Additional Features 1 Rangable
- Compensated Temperature, Max 65 °C
- Compensated Temperature, Min -4 °C
- Electrical Connection Screw Terminal
- Enclosure Material Enamel coated 18GA steel
- Enclosure Ratings IP65, NEMA Type 4
- Media Compatibility Clean dry air / inert gas, Fuel gases, HVAC / room air, Inert / non-reactive gases, Hydrogen, Nitrogen, Non-corrosive Dry Gasses, Oxygen
- Measurement Pressure, Min 0 inH₂O
- Series ID PX276
- Thermal Effect 0.02% FS/°C
- Thermal Effect on Span error, Max ± 1% gage
- Weight 454 g
Supported Applications
The Omega PX276 series consists of rugged duct pressure transmitters that integrate a static pressure probe with the transmitter in a single unit. Designed for measuring low-pressure differentials, these devices are specified for use with clean, dry air or any inert gas.
- Static duct pressure monitoring
- HVAC system verification and balancing
Operating Conditions & Performance
The PX276 series provides an accuracy of ±1.0% FS with a compensated temperature range of 25°F to 150°F (-4°C to 65°C). The operating temperature range extends from -18 to 80°C (0 to 175°F), and the units are rated for environments up to 90% relative humidity, non-condensing. Each transmitter is protected against short circuits and reverse polarity.
- Overpressure rating: 10 psi
- Housing protection: NEMA 4 (IP65)
Configuration Options
The series offers two primary model configurations, PX276-05GI and PX276-15GI, each providing three field-selectable pressure ranges via internal switches. The units feature a 4 to 20 mA (2-wire) output signal compatible with specific Omega meters including the DP24-E, DP25B-E, and DP41-E.
Selectable Ranges
- PX276-05GI: 0 to 5.0 inH₂O (default), 0 to 2.5 inH₂O, or 0 to 1.25 inH₂O
- PX276-15GI: 0 to 15.0 inH₂O (default), 0 to 7.5 inH₂O, or 0 to 3.75 inH₂O
Construction & Connections
- Housing material: Enamel-coated, 18 GA steel enclosure with a baked-on enamel finish (PMS2GR88B)
- Probe sheath: 6061T aluminum
- Electrical connection: Unpluggable screw terminal block accepting wire sizes up to 12 Ga max.
Power & Output Options
The transmitters operate on a supply voltage of 12–40 VDC. While the primary output is 4–20 mA, documentation indicates availability for 0–5 VDC and 0–10 VDC outputs depending on configuration.
- Load resistance: 3K ohms max at 40 VDC (mA units); 1K ohms min (VDC units)
Key Product Differences
The PX276 series is distinguished by its integrated probe design and selectable range capability within a single enclosure. The two available variants differ only in their maximum pressure span: the -05GI model covers ranges up to 5.0 inH₂O, while the -15GI model supports spans up to 15.0 inH₂O. Both models include NIST-traceable calibration and a one-year warranty.
- Model PX276-05GI: Lower range envelope (max 5.0 inH₂O)
- Model PX276-15GI: Higher range envelope (max 15.0 inH₂O)
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