Overview
The Omega PX409-750AI is a high-accuracy 0-750 psia absolute pressure transducer built on Omega's micro-machined piezoresistive silicon platform, delivering ±0.08% BSL accuracy that combines linearity, hysteresis, and repeatability into a single specification. A custom ASIC applies digital dynamic thermal compensation across the full temperature and pressure range, so the transducer holds its accuracy where lower-grade devices drift. It outputs a 4-20 mA signal and ships with a 5-point NIST-traceable calibration certificate documenting its as-shipped accuracy.
Best for
- Aerospace, automotive, and test-bench measurement requiring reference-grade accuracy
- Industrial process and equipment OEM applications with wide ambient temperature swings
- 4-20 mA input PLCs, data loggers, and panel meters
- Rugged, washdown-capable (IP67) all-stainless installations
Warranty
Backed by Omega's standard 13-month warranty (1-year coverage plus a one-month shipping grace period) against defects in materials and workmanship. ZOT Supply is an authorized Omega distributor offering fast nationwide and international shipping. Each unit ships with its 5-point NIST-traceable calibration certificate.
Key Features
0.08% BSL Accuracy
Linearity, hysteresis, and repeatability combined into a single ±0.08% best-straight-line specification, verified on 100% of units.
Digital Thermal Compensation
A custom ASIC maps temperature, pressure, and output performance to dynamically compensate across the compensated range, holding span and zero where competitors drift.
5-Point NIST Calibration
Every transducer ships with a 5-point NIST-traceable calibration certificate documenting its as-shipped accuracy.
Ruggedized Silicon Core
Piezoresistive silicon in a glass-to-metal sealed chamber with a 316 SS diaphragm and secondary fluid containment in the event of a diaphragm rupture.
Protected Electronics
Reverse-polarity, EMC, and power-supply fluctuation protection are standard, with 300% minimum proof pressure on the sensing element.
IP67 All-Stainless Build
316 SS wetted parts and an IP67-sealed cable backend for wet, washdown, and harsh industrial environments.
Technical Specifications
| Specification | Value |
|---|---|
| Pressure Range | 0-750 psia (0-51.7 bar) |
| Pressure Type | Absolute |
| Output | Current Loop (4 to 20 mA) |
| Supply Voltage | 9 to 30 Vdc; max loop res = (Vs-9) x 50 Ω |
| Accuracy (Linearity, Hysteresis, Repeatability) | ±0.08% BSL maximum |
| Long-Term Stability (1-Year) | ±0.1% FS typical |
| Zero / Span Setting | ±0.5% FS typical (1% maximum) |
| Operating Temperature | -45 to 115°C (-49 to 240°F) |
| Compensated Temperature | -29 to 85°C (-20 to 185°F) |
| Thermal Effects (Zero / Span) | ±0.5% span over compensated range |
| Proof Pressure | 300% of span minimum |
| Process Connection | 1/4-18 NPT Male |
| Electrical Termination | 2 m (6') Integral Cable |
| Wetted Parts | 316 Stainless Steel |
| Environmental Protection | IP67 |
| Response Time / Bandwidth | <1 ms / DC to 1 kHz typical |
| Approvals | CE, RoHS; 5-point NIST-traceable calibration included |
Documentation
Frequently Asked Questions
What does the ±0.08% BSL accuracy include?
It is a best-straight-line specification combining linearity, hysteresis, and repeatability into one number, so it reflects total measurement error rather than a single contributor.
Does this transducer come calibrated?
Yes. Every unit ships with a 5-point NIST-traceable calibration certificate documenting its as-shipped accuracy.
What supply voltage does the 4-20 mA output need?
The Current Loop (4 to 20 mA) output requires 9 to 30 Vdc; max loop res = (Vs-9) x 50 Ω.
What is the absolute pressure reference?
A absolute transducer references a sealed internal vacuum, reading true (absolute) pressure independent of barometric changes.
Can it handle wet or washdown environments?
Yes. The cable backend is sealed to IP67 and all wetted parts are 316 stainless steel.
- Brand:
- Omega
- Series:
- PX409
- Pressure Type:
- Absolute
- Pressure Range:
- 0-750 psia
- Output Signal:
- 4-20 mA
- Accuracy:
- 0.08% BSL
- Process Connection:
- 1/4 in Male NPT
- Electrical Connection:
- 2 m Cable
- Environmental Rating:
- IP67
- Wetted Material:
- 316L SS
