Temperature
CALIBRATION TIPS
Before calibrating any other Pro Plus sensor, verify that the temperature sensor is reading accurately by
comparing it to a traceable thermometer or other known reference in a water bath. Temperature compensation is
used in every other sensor measurement so its accuracy should be verified and recorded each time the Pro Plus
is calibrated. Be sure to consider the specification tolerances of both the Pro Plus temperature sensor and the
thermometer when comparing the measurements.
The Pro Plus temperature sensor can not be calibrated nor should calibration be required.
TROUBLESHOOTING TIPS
If the temperature sensor is not reading accurately, ensure that it is clean and free of debris. The conductivity
cleaning brush and warm water with mild detergent can be used to scrub the temperature sensor if needed.
Alternatively, you can use a toothbrush to clean the sensor.
Quatro Cables
Quatro cables have a replaceable combination conductivity/temperature sensor (p/n 005560). All other Pro Plus
cables have integral temperature sensors. If using a Quatro cable and your temperature sensor is not reading
accurately, remove the conductivity/temperature sensor from the cable. The Pro Plus should read ----- °C without
a temperature sensor installed. If the instrument is reading any other value, the conductivity/temperature port on
the cable may be contaminated. Refer to the Cleaning the Sensor Port section of this document for information
on how to clean the port.
After cleaning the port, recheck the temperature reading. If the temperature reading is still not displaying ----- °C
without the sensor installed, there may be a problem with the cable and/or instrument. In this case, contact your
local YSI Representative or a YSI Authorized Service Center.
Other Pro Plus Cables
If your temperature sensor is not reading accurately after cleaning around the sensor, contact your local YSI
Representative or an YSI Authorized Service Center.
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