Probe Maintenance - OHAUS STARTER 400D Manual De Instrucciones

EN 14 STARTER 400D Portable DO Meter
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5.3

Probe maintenance

The DO probe measures the oxygen based on luminescence principle. The optical DO probe
measures dissolved oxygen by emitting a blue light of the proper wavelength that causes the
sensing element to luminesce. Oxygen dissolved in the sample continually passes through the
diffusion layer to the sensing layer, affecting the luminescence lifetime. STDO21 can measure the
lifetime of the luminescence as it is affected by the presence of oxygen and compared with the
reference. This technology has been approved by EPA.
When measurement, optical probe did not consume the DO in the sample, that means the sample
do not need stir
Optical probe STDO21 do not need to replace the membrane or any maintenance of anode or
cathode. The optical probe only requires that its sensor cap be replaced every 12-18 months.
Please input the new cap parameter when new probe cap in installed, then do calibration before
any measurement.
When storing the probe for a longer period, make sure it is placed in the wetting protection cover.
Calibration frequency: Ohaus suggest verifying the calibration regularly according to your
measurement requirement. STDO21 only has very little calibration drift when compared to
electrochemical probes. This advantage results in less frequent calibrations. In fact, optical probes
are so stable they are capable of holding their calibration for many months.
Please also read the STDO21 probe manuals before using it.
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