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MA300TS-0210
5. Measurement
This device is an option for the PACK MASTER (RO-105S). Dissolved oxygen (DO) in liquid can be measured with
limited exposure to air using this device.
The measurement value can be measured and saved as either the dissolved oxygen amount (mg/L) or dissolved oxygen
saturation rate (%).
When the ambient temperature changes, such as when the measurement environment has
changed due to unpacking or relocation of the device installation place, the temperature
change may cause the indicated value to fluctuate gradually. In this case, set the oxygen
sensor in this device and expose it to the atmosphere for 30 minutes or longer so that the
temperature sufficiently stabilizes
Do not use a 3-way check valve to measure samples containing fibers or solids.
When measuring a sample containing fibers or solids, refer to section “5. Measurement (3)
Measuring a sample containing fibers or solids” on page 15 of this manual.
(1) Measuring a sample (Sample that does not contain fibers or solids)
Step 1. Carefully mount the oxygen sensor (WA-BRM5) on the housing unit.
Do not insert the oxygen sensor forcefully.
Forcefully inserting the sensor can apply a load on the
membrane and affect the measurement value.
If there is a gap between the oxygen sensor and
housing unit, the solution will not be mixed properly
and the measurement value will be affected.
Completely insert the oxygen sensor into the back of
the housing so that there is no gap.
Step 2. Set the sample.
Avoid exposing the sample to the atmosphere when
setting it. Set the suction tubing so it is as close to the
bottom as possible.
When suctioning the sample, suction from the bottom
of the container as much as possible. If the sample is
taken from close to the water surface, the air may
dissolve in the sample and cause a measurement
error.
Tip of suction tubing
