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MA300TS-0210
6. Maintenance
(1) Cleaning after measurement
1. Cleaning the MA-300
When finished measuring the sample, discharge the sample remaining in the syringe, housing, and tubing. Suction and
discharge tap water by operating the syringe in the same manner as measuring a sample.
If the parts are heavily contaminated, clean with a neutral detergent, etc., and allow to dry. If the injection inlet or discharge
outlet of the housing, etc., are clogged, use the enclosed cleaning brush to remove the clogged matter.
Never use an ultrasonic cleaner to clean the parts. There is a risk of cracking.
Never use alcohol or solvent when cleaning. There is a risk of housing clouding or cracking.
Before removing the oxygen sensor, remove all sample solution and tap water in the device
and make sure that negative pressure is not generated in the housing. Negative pressure in
the housing could damage the oxygen sensor’s membrane.
2. Cleaning and storing the oxygen sensor
Clean the oxygen sensor when finished with zero calibration or measuring the sample.
Step 1. Fill a container, such as a beaker with tap water, and lightly rinse the oxygen sensor in the container.
Always clean the oxygen sensor with tap water filled in a container. If cleaned with tap water directly from the
faucet, the pressure of the water could break the membrane on the sensor surface.
Step 2. Wipe off the moisture lightly with tissue paper and store the sensor in the atmosphere.
When removing the oxygen sensor from the
main unit and storing it, always attach the pin
shorting cap as shown on the right to maintain
the quality.
(2) Replacing the oxygen sensor membrane and electrolytic solution
In principle, the oxygen sensor (WA-BRM5) will degrade over time. The oxygen sensor membrane and electrolytic
solution must be replaced in the following cases. When making the replacement, use the enclosed “Membrane solution
set (Model: GT-41).”
Refer to the replacement procedures in the “Maintenance Guide” enclosed with the oxygen sensor and correctly replace
the parts.
When the “Sensor Error” message is displayed.
When the measurement value stabilizing time is slow.
When residues appear in the oxygen sensor’s electrolytic solution. (White or yellow powder, etc.)
When use has been suspended for a long time (several months).
When the membrane is damaged.
Pin shorting cap
View from pin side
Pin shorting cap
