[aeacfm]

 in our lab we working with dissolved oxygen analyser , used to determine dissolved oxygen in deaerated sea water
the instrument we were using was  orbisphere ( 3600 ORBISPHERE ) but suddenly the results goes wrong and we cant apply calibration for it ?

can some one advice me with good instrument to buy ???if any thing other than orbisphere it would be better

[dense1]

A top of the line analyzer would be from World Precision Instruments, but brace yourself as they are expensive. YSI can hold its own as well.

Before buying a new one, you might check your flow conditions: is there opportunity for atmospheric oxygen to infiltrate (e.g., through a long span of silicone tubing or in a open cup, especially if flow rates are low).

[aeacfm]

good shot buddy

[aeacfm]

A top of the line analyzer would be from World Precision Instruments, but brace yourself as they are expensive. YSI can hold its own as well.

could you please send its page online or its model or any information

thanks in advance