Phosphine Gas Sensing for Fumigation and Process Safety

Alphasense phosphine (PH₃) sensors support fumigation, grain storage, semiconductor and industrial safety applications. The portfolio includes A-Series and B-Series sensors with multiple ranges and IST variants to address both low-level exposure monitoring and high-range process control.

Sensor Product Overview

Portable & Low-range – A-Series PH₃ Sensors

• PH3-A1 – A-Series sensor for 0–10 ppm applications in portable and fixed devices.

Fixed & Extended Range – B-Series PH₃ Sensors

• PH3-B1 – B-Series low-range sensors (0–10 ppm) for portable/fixed monitoring in high-humidity environments.
• PH3-BE – B-Series extended-range sensors (0–2,000 ppm) for process and fumigation applications (supersedes PH3-AE).

Integrated Smart Technology (IST) PH₃ Sensor Versions

• PH3-A1-IST | PH3-B1-IST | PH3-BE-IST – IST variants with embedded calibration and temperature sensing to reduce integration time.

Choosing the Right PH₃ Sensor by Application

Fumigation Plants & Grain Storage

• PH3-A1 | PH3-B1 – Low-range safety monitoring in portable detectors and fixed systems around fumigation facilities and grain storage.

High-range / Process Control / Fumigation Monitoring

• PH3-BE – Extended-range B-Series sensors for process streams and high-concentration applications.

Key Benefits Across the PH₃ Sensor Portfolio

• Wide coverage levels from 0–10 ppm up to 0–2,000 ppm to support both worker protection and process-level monitoring.
• A-Series and B-Series footprints for portable analyzers and fixed high-humidity installations.
• IST “+” options reduce calibration complexity and support plug-and-play field replacements.

Why OEMs Choose Alphasense

• A clear, documented range structure (A1, B1, BE and IST variants) that maps directly onto fumigation and industrial safety use cases.
• Consistent electrochemical and mechanical platforms shared with other toxic gas sensors, reducing overall engineering effort.

How PH₃ Sensors Work

PH₃ sensors are electrochemical amperometric devices, with phosphine reacting at the working electrode to generate a measurable current. B-Series packages provide larger electrolyte volumes for robustness in long-term fixed systems, while IST variants embed calibration and temperature data to support accurate, digitally integrated detection.

Why Measure Phosphine Gas

Phosphine is a highly toxic, reactive gas commonly used in fumigation and some industrial processes. Monitoring PH₃ is essential to:

• Protect workers in grain handling, fumigation and related environments.
• Control process conditions and prevent over-exposure or unsafe release events.