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Why change them frequently?

A blocked needle restricts gas flow from the test pack into the analyser. This blockage can cause pressure errors inside the unit causing the pump to overwork. This can result in pre-mature sample pump failure and require it’s replacement. A servere blockage will cause the unit to alarm & no test value be derived from that test pack.
How often would we recommend them to be changed?
Or how would we suggest they are checked to see if they need changing?

Dansensor Needles 0.8mm Green
Dansensor Needles 0.8mm Green