Compare Oxygen Deficiency Monitors
Not all oxygen deficiency monitors are the same. Like automobiles or cell phones, they vary in quality and performance.
Many monitors use “fuel cell” oxygen sensors, which typically need replacement every 10-14 months. However, as these sensors age, their electrical output decreases, mimicking a low oxygen signal. This can lead to false alarms, which, when ignored, can create dangerous situations. Personnel may dismiss alarms as false, potentially missing real low-oxygen events. This frustration may even lead to disabling alarms, increasing risk.
Zirconium oxide-based monitors often claim to be calibration-free for over 10 years, but these claims are misleading. One major supplier of zirconium oxide sensors makes no such claims. Closer inspection of the user manuals reveals that these sensors require periodic adjustments and calibration. Experts agree that gas monitors need occasional checks to ensure accurate readings and protect personnel. The stakes are high, and cutting corners can be dangerous.
CAPABILITIES |
Series 1300 Oxygen
|
Fuel Cell Oxygen Monitor |
High Temperature (450 °C) Zirconium Oxide Oxygen Monitor |
| Three-year warranty on both the electronics and sensor |
YES |
NO – Typically one year |
NO – Typically two years |
| Accepts up to 3 oxygen sensors with one set of electronics drastically reducing the per point monitoring costs
|
YES |
NO |
NO |
| Built-In data logger standard |
YES |
NO |
Limited Availability |
| Easy field replacement of the oxygen sensor |
YES |
YES |
NO – Both sensor and mating electronics need replacement – an expensive repair |
| Built in alarm relay contacts |
YES (4 Standard) |
Some at extra charge |
Often an extra charge |
| Can be affected by changes in ambient air now caused by HVAC / air handling systems |
NO |
NO |
YES – Changes in airflow may sufficiently cool the high temperature sensor producing erroneous oxygen readings. |
| Can be used in the presence of combustible gases, refrigerant gases, other reducing gases |
YES |
YES |
NO |
| Long-life oxygen sensor |
YES |
NO |
Can fail prematurely from heat fatigue |
Alpha Omega, alpha omega instruments, oxygen deficiency monitors, oxygen monitors, Process Insights