Overview
The Omega PX429-2.5DDUI is a 0-2.5 psid wet/dry differential pressure transducer that measures the difference between a wetted high-pressure port and a dry (gas or reference) low side. Built on Omega's micro-machined piezoresistive silicon core with digital dynamic thermal compensation, it delivers ±0.08% BSL accuracy combining linearity, hysteresis, and repeatability. It outputs a 4-20 mA signal and ships with a 5-point NIST-traceable calibration certificate. The serial number and range marking identify the high-pressure port.
Best for
- Filter and strainer monitoring, flow, and liquid-level differential measurement
- Test benches and industrial, automotive, or aerospace differential applications
- Processes pairing a wetted high side against a dry or vented reference
- 4-20 mA input PLCs, data loggers, and panel meters
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
Wet/Dry Differential
Measures the difference between a wetted high-pressure port and a dry or reference low side on a single micro-machined silicon core.
0.08% BSL Accuracy
Linearity, hysteresis, and repeatability combined into a single ±0.08% best-straight-line specification.
Digital Thermal Compensation
A custom ASIC maps temperature, pressure, and output to dynamically compensate across the compensated range, holding span and zero where competitors drift.
316L Welded Stainless Build
Welded stainless construction with 316L SS wetted parts and secondary containment for rugged, long-life service.
1 Million Cycle Life
Rated for a minimum of one million pressure cycles with ±0.1% FS typical long-term (1-year) stability.
5-Point NIST Calibration
Every transducer ships with a 5-point NIST-traceable calibration certificate documenting its as-shipped accuracy.
Technical Specifications
| Specification | Value |
|---|---|
| Pressure Range | 0-2.5 psid (0-170 mbar) |
| Pressure Type | Differential, Wet/Dry, Uni-Directional |
| Output | Current Loop (4 to 20 mA) |
| Supply Voltage | 9 to 30 Vdc; max loop res = (Vs-9) x 50 ohm |
| Accuracy | ±0.08% BSL (linearity, hysteresis, repeatability) |
| Long-Term Stability (1-Year) | ±0.1% FS typical |
| Operating Temperature | -45 to 115°C (-49 to 239°F) |
| Compensated Temperature | -17 to 85°C (1 to 185°F) |
| Thermal Effects (Zero / Span) | ±1.00% span over compensated range |
| Proof Pressure (Differential) | See wet/dry datasheet by range |
| Line / Static Pressure | See wet/dry datasheet |
| Pressure Cycles | 1 million minimum |
| Pressure Ports | 1/4-18 NPT Male, each end |
| Wetted Parts | 316L Stainless Steel |
| Environmental Protection | IP65 |
| Response Time / Bandwidth | <1 ms / DC to 1 kHz typical |
| Weight | 200 g (7 oz) maximum |
| Approvals | CE (EN61326-1), RoHS; 5-point NIST-traceable calibration included |
Documentation
Frequently Asked Questions
What does wet/dry differential mean?
The high-pressure port is wetted by liquid or gas while the low side is a dry or vented reference, so the transducer reads the difference between a wet line and a dry reference.
How do I identify the high-pressure port?
The serial number and range marking on the body identify the high-pressure port.
Does this come calibrated?
Yes. Every unit ships with a 5-point NIST-traceable calibration certificate documenting its as-shipped accuracy.
Does the twist-lock need a mating connector?
Yes, the PT06F10-6S mating twist-lock connector is ordered separately.
- Series:
- PX409-DIF
- Pressure Type:
- Differential Wet/Dry
- Pressure Range:
- 0-2.5 psid
- Output Signal:
- 4-20 mA
- Accuracy:
- 0.08% BSL
- Process Connection:
- 1/4-18 NPT Male
- Electrical Termination:
- Twist-Lock
- Environmental Rating:
- IP65
- Wetted Parts:
- 316L SS
- Mounting:
- In-Line Process
