OCS-3FRL is a powerful model that features humidity compensation and atmospheric pressure compensation functions.

This sensor has two detection modes capable of detecting two types of gas sources.

Mode 1: the oxygen concentrator mixes air with the oxygen purity reaching up to 95.6%.

Mode 2: pure oxygen is mixed with air with the oxygen purity reaching up to 99.9%.

When using mode 1 to detect pure oxygen the purity readings will be much lower.

Its flow detection range is 0 to 20 liters per minute.

And it can also detect nitrogen with an oxygen purity of 0 to 21 percent.

Therefore this sensor is equipped with two software modes.

Sealed bottom mode: the minimum oxygen purity is 21% : 21 to 95.6%/ 99.9%.

Unsealed bottom mode: the minimum oxygen purity is 0%: 0 to 95.6%/ 99.9%.

The sealed bottom is to ensurethat the zero point is above 21 percent avoiding the possibility of a zero point of 19.5 percent or higher.