A Systematic Approach to Resolving Low Oxygen Purity Alarms (Part 1)
Introduction
A persistent low oxygen purity alarm is one of the most pressing issues a biomedical engineer can face when servicing an oxygen concentrator. This article, the first in a two-part series, details the fundamental checks required to diagnose the root cause of low purity, focusing on the essential components of the pneumatic pathway.
Core Principles of Purity Failure
Low oxygen purity typically stems from a handful of common failures within the Pressure Swing Adsorption (PSA) system. Before delving into complex electronics, it is critical to verify the mechanical and pneumatic integrity of the concentrator.
- Sieve Bed Condition: The zeolite material within the sieve beds is the heart of the concentrator. We demonstrate how to assess whether the beds are channeling, compacted, or contaminated.
- Valve Functionality: The proper cycling of intake and exhaust valves is crucial for building and releasing pressure. A leaking or stuck valve can disrupt the entire PSA cycle.
- Pressure Regulation: Verifying that the system’s pressure regulator is calibrated correctly and maintains the optimal operating pressure for the sieve beds.
- System Leaks: A methodical check for leaks throughout the pneumatic pathway is a critical and often overlooked step.
Building a Foundation for Accurate Diagnosis
By systematically ruling out these common mechanical faults, you can approach more complex diagnostics with greater certainty. This foundational check is essential for ensuring a lasting repair.
Watch the full tutorial here: How to Deal With Low Oxygen Purity: Part 1
