Johnson Controls DP1402X5U21D Transducer

The Johnson Controls DP1402X5U21D is a high-precision low differential pressure transducer designed for critical HVAC monitoring and building automation systems. Engineered as the direct functional replacement for the DPT2641-2R5D, this unit features a 0-2.5" wc pressure range and provides a stable 4-20mA output signal for seamless integration with industrial controllers. The unidirectional sensing element is housed in an IP67-rated housing, ensuring long-term reliability in environments with high humidity or airborne contaminants. With a plus/minus 0.5% accuracy rating, it delivers the precise feedback necessary for static pressure sensor applications and VAV box control. The hardware utilizes 1/4" push-on barb fitting process connections, allowing for fast, secure installation of pneumatic tubing. This transducer is optimized for differential pressure measurement in cleanrooms, laboratories, and commercial air handling units where maintaining strict pressure differentials is mandatory for system performance and air quality standards.

• Industrial-Grade Protection: The IP67-rated housing protects internal circuitry against dust and water ingress, extending the service life in demanding mechanical rooms.
• Drop-in Compatibility: Specifically designed to replace the legacy DPT2641-2R5D, reducing field engineering time during system upgrades.
• Precision Calibration: Maintains plus/minus 0.5% accuracy, ensuring building automation system sensors receive reliable data for energy-efficient operation.
• Standardized Integration: The 4-20mA output signal is compatible with the vast majority of PLC and DDC architectures used in modern HVACR control loops.

How should the 1/4" push-on barb fittings be secured?
For differential pressure measurement, ensure the tubing is sized correctly for a friction fit; however, in high-vibration environments or systems with pressure spikes, use small zip-ties or clamps to prevent the tubing from backing off the 1/4" push-on barb fitting.

Can the DP1402X5U21D handle bidirectional pressure flow?
No, this model is a unidirectional transducer calibrated for a 0-2.5" wc pressure range. If your application requires monitoring both positive and negative pressure relative to a reference point, a bidirectional model must be specified.

What are the wiring requirements for the 4-20mA loop?
As a low differential pressure transducer utilizing a current loop, it requires a shielded twisted pair to minimize EMI/RFI interference, which is critical when runs are near high-voltage motor leads or VFDs.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.