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When loading tanks are flushed with inert gases, the oxygen content drops proportionally to the amount of inert gases used. Catalytic EX sensors need a minimum content of oxygen in the sample gas to be able to correctly measure combustible gases. As this minimum content is generally not available during inertization, instruments with catalytic sensors are not suitable for conducting EX measurements in inert atmospheres.
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One possible solution to this problem is to use infrared technology (IR) to conduct EX measurements. The IR-Ex sensors reliably measure the concentrations of combustible gases, even if no oxygen is present, and give a dependable warning of potentially explosive gas concentrations. This gives you complete peace of mind when using the Multiwarn II or the X-am 7000.
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