Sneak Peek: AV Sensors Developing the New CHT-NFP 1865 Infusion Pump Sensor

As medical OEMs continue to advance infusion and drug-delivery platforms, the demand for high-reliability, low-pressure force and occlusion sensing remains central to patient safety and system accuracy. One long-standing reference design in this space has been the Model 1865 infusion pump sensor, widely deployed across peristaltic and syringe pump platforms.

As a sneak peek into AV Sensors’ 2026 medical product roadmap, AV Sensors is pleased to announce the development of the CHT-NFP 1865 Series—a next-generation Infusion Pump (NFP) force/pressure sensor engineered to support both legacy analog architectures and future digital integration strategies.

Engineering samples are planned for availability in April 2026

Infusion Pump Sensors: A Proven Medical Application

Infusion pump force and pressure sensors play a critical role in modern medical equipment by monitoring applied force through a flexible membrane. In established designs such as the Model 1865, this sensing approach enables accurate detection of:

• Occlusion pressure in peristaltic pumps

• Infiltration and blockage conditions

• Syringe pump delivery accuracy

• Diagnostic feedback for critical-care systems

These sensors are traditionally implemented using a silicon piezoresistive Wheatstone bridge, combined with a precision silicone diaphragm capable of surviving millions of mechanical load cycles while maintaining stable, low-pressure sensitivity

Introducing the CHT-NFP 1865 Series from AV Sensors

Building on this well-established application model, AV Sensors is developing the CHT-NFP 1865 Series using its Advanced Sensor Ceramic Hybrid Technology (CHT) platform.

The CHT-NFP 1865 is a temperature-compensated, mV-level output sensor designed specifically for infusion pump occlusion sensing in both peristaltic and syringe pump systems. Like legacy solutions, it employs a durable silicone diaphragm to transfer applied force to a silicon MEMS sensing element—ensuring high sensitivity at low pressures while maintaining long-term mechanical robustness.

Each sensor is individually calibrated and laser-trimmed, delivering a high-level, linear output when operated with either constant current or constant voltage excitation

Drop-In Replacement Today — Platform for Integration Tomorrow

While the CHT-NFP 1865 Series has been mechanically and electrically designed to function as a drop-in replacement for existing Honeywell Model 1865-based designs, its architecture also enables a clear migration path to higher levels of system integration.

Drop-In Compatibility

For OEMs supporting installed platforms or executing controlled second-source strategies, the CHT-NFP 1865 Series maintains:

• Comparable mechanical form factor and diaphragm geometry

• Analog Wheatstone-bridge-based sensing architecture

• mV-level outputs compatible with existing analog signal chains

• Constant current or constant voltage excitation options

• Temperature-compensated performance across medical operating ranges

This allows minimal redesign effort while preserving validated system behavior.

Next-Level Integration Options

Beyond drop-in replacement, the CHT-NFP platform is engineered to support next-generation infusion pump electronics, including:

• High-level analog outputs for improved noise immunity and simplified signal conditioning

• 24-bit digital output architectures (I²C / SPI) for direct MCU integration

• Enhanced diagnostic resolution for occlusion trend analysis

• Reduced external component count at the system level

• Improved manufacturing repeatability and calibration traceability

This dual-path strategy enables medical OEMs to reuse existing analog designs today, while preparing for digitally integrated pump platforms tomorrow—without changing the mechanical sensing interface.

Designed for Medical OEM Integration

The CHT-NFP 1865 Series is being developed to meet the practical requirements of medical device manufacturers:

• Force-based occlusion sensing for peristaltic pumps

• Pressure-based monitoring for syringe and dispensing systems

• Ceramic hybrid construction for long-term stability

• Medical-grade materials and controlled diaphragm compliance

• Configurable analog and digital interface options

This flexibility supports new product development, platform refresh cycles, and long-term lifecycle management for regulated medical devices.

A Look Ahead to 2026

The CHT-NFP 1865 Series represents one of several medical sensing platforms planned for release as part of AV Sensors’ upcoming product roadmap. These developments reflect a continued focus on:

• Supply-chain resilience and second-source strategies

• Application-specific sensor optimization

• Analog-to-digital migration paths for medical OEMs

• Scalable architectures across infusion and drug-delivery systems

Engineering samples are targeted for April 2026, with early engagement now available for OEMs planning next-generation infusion platforms. Digital output configurations are expected in Fall 2026.

Engage Early

If you are designing or supporting infusion pumps, syringe pumps, or medical dispensing systems, AV Sensors welcomes early discussions around evaluation samples, interface options, and roadmap alignment for the CHT-NFP 1865 Series.

This sneak peek marks just the beginning of what’s coming in 2026.

CHT-IFP 1865 Series

https://www.avsensors.com/load-cell/cht-nfp1865

John Valentini, Business Development AV Sensors (business.development@avsensors.com)