YSI 6 series Bedienungsanleitung PDF herunterladen (Seite 23)

HIGH OR LOW DO GAIN (RANGE 0.7 TO 1.4)

The DO gain number is a multiplier. It is usually out of tolerance when the DO charge or the High/Low

warm-up fails. Corrective actions involve the same procedures used for the charge and warm-up.

HOW TO TEST FOR MEMBRANE PUNCTURES BEFORE DEPLOYMENT

The easiest way to test for membrane punctures is to use a 1,000 mL beaker of saturated tap water. After

calibrating the sonde in a wet towel or saturated air, run the sonde in discrete mode in saturated air and

record the value when stable. It will read less the 100% if the sonde was calibrated for Unattended

Mode use.

Now place the instrument in the beaker and watch the DO%. If it reads 98.2 % in saturated air and the

readings go up by one or two percent, then the membrane is leaking. The leak could be a pinhole in the

Teflon or a loose-fitting o-ring. Replace both when a leak is found.

A small aquarium pump with air-stone is required to saturate the water in the beaker. Give the pump 30

minutes to saturate your tap water.

PORT AND PROBE CLEANING PROCEDURE

To remove contamination -- which can include grease, saltwater electrolyte, and calibration reagents --

the probes and sonde can be submerged in hot tap water which has had dishwashing soap (with a

degreaser) added. The temperature should be around 35 to 40°C. The soapy water mix must be pumped

into the open sonde ports and probe connector to be effective. Using a lab rinse bottle will help flush out

the ports. Soak the probe and affected sonde connectors for one hour. Rinse thoroughly with DI water

after the soak. Follow this with a thorough rinse of 90% isopropyl alcohol. Shake or blow dry the port

with a dry air source or allow air-drying overnight.

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YSI 6 series Bedienungsanleitung Seite 23