Inert gas system oxygen analyzers

Good afternoon!
We have recently experienced frequent failures of the inert gas oxygen analyzers.
Their repair is quite expensive.
Do you have any recommendations for avoiding this kind of failures?

Due to repeated failure of oxygen analyzer in shipping company hands, ship buyers have requested to use oxygen analyzer of SERVOMEX made.
Thereafter failure report have been considerably reduced to almost nothing.
Now, but, unknown if SERVOMEX still produce their goods in the market.


Servomex is indeed considered as one of the most reliable manufacturers of IG oxygen analyzers.

The root causes behind the majority of the failures of oxygen analyzers are either improper handling or incorrect maintenance.
In order to reduce the frequency of the said failures, it is recommended to follow the below procedures.

  1. Before the use of oxygen analyzer:
  • 2-3 days before the operation, clean or replace the filters and refill with clean fresh water.
  • 1 day before the operation, calibrate the oxygen analyzer sensor. The duration of the zero calibration would be normally 2.5 - 4 minutes and that of the span calibration with fresh air would be around 1.5-2 minutes. Recommended flow range around 50-80ml/min. The abrupt increase of the flow might damage the sensor.
  1. Upon completion of the inerting operations and while the oxygen analyzer is not in use:
  • Purge the system with nitrogen for about 2-3 minutes.
  • Close all sampling valves and leave the system filled with nitrogen.
  • Drain the water from the water filter.
  • Switch of the power of the oxygen analyzer.
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