YSI 6 series Manual do Utilizador descarregar pdf (Página 19)

CONDUCTIVITY&TEMPERATURETROUBLESHOOTING

6560 TEMPERATURE & CONDUCTIVITY SENSOR

The temperature sensor should be tested from time to time to ensure proper operation. Before beginning

any calibration, check the accuracy of your sonde’s temperature probe with a traceable thermometer. If

you find disagreement between the temperature measurement of the sonde and the standard (in liquid),

then you must investigate the cause. The 6560 temperature/conductivity probe does not have a

temperature calibration. If you confirm an error, then the probe should be removed. The temperature of

the sonde should display -9.99°C without its sensor. A sonde with a number other than -9.99 is most

likely dealing with a contaminated port or a circuit malfunction. Follow the cleaning procedures to clean

the sonde port connector.

The conductivity calibration generates its cell constant number after calibration. Any significant jump or

change in this number from one calibration to the next is usually an indicator of a problem. If you are

sure that your standards are good and your process was correct, then you must identify the source of the

problem. Conductivity must read zero or very close to it when in distilled water or when dry and in air.

If the probe measures conductivity (>3 us/cm) when in either of these conditions, then you must

determine why the probe is reporting conductivity when it is not in a conductive medium.

Start by removing the temperature/conductivity probe from the sonde and check the output with the

sonde in the Discrete Run Mode. Without the sensor the temperature output must drop to -9.99 C. The

conductivity must read 0.00 ± 3 us/cm. If the conductivity immediately drops when the sensor is

removed, then the probable cause is water leakage into the sensor. If the conductivity reading remains,

perform the probe and port cleaning procedure.

SONDES WITH INTEGRAL TEMPERATURE & CONDUCTIVITY SENSORS

Sondes such as the 600OMS, 600LS, 600QS, and 600R are equipped with a built-in thermistor that is

part of the sensor endcap. These cannot be isolated with disassembly of the sonde and can only be

serviced by a YSI authorized repair facility. The 600OMS, 600LS, 600QS, and 600R are also equipped

with an integral conductivity sensor that cannot be replaced by the user. The conductivity must read 0.00

± 3 us/cm in air after the conductivity cell has been cleaned and dried.

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 Manual do Utilizador Página 19