Hanna Instruments HI 98188 User Manual

Page 53

TEMPERATURE CALIBRATION

(for technical personnel only)

All the instruments are factory calibrated for temperature.
Hanna’s temperature probes are interchangeable and no temperature
calibration is needed when they are replaced.
If the temperature measurements are inaccurate, temperature recalibration
should be performed.
For an accurate recalibration, contact your dealer or the nearest Hanna
Customer Service Center, or follow the instructions below.
Press “T” functional key to enter the temperature calibration mode while in EC
or Salt calibration screens .
It is better to perform a 2 points calibration.
The calibration can be performed in any two points that have at least 25 ºC
distance between. It is recommended that the first point be near 0 ºC and the
second point near50 ºC.
• Prepare a vessel containing ice and water and another one containing hot

water (at approximately 50 ºC or 122 ºF). Place insulation material around
the vessels to minimize temperature changes.

• Use a calibrated thermometer with a resolution of 0.1 ºC as a reference

thermometer. Connect the HI 76313 EC probe with built in temperature
sensor to the appropriate socket.

• Immerse the HI 76313 probe into the vessel with ice and water as close as

possible to the reference thermometer. Allow a few seconds for the probe to
stabilize.

• Use the ARROW keys to set the calibration point value to that of ice and

water mixture, measured by the reference thermometer. Set the calibra-
tion point value to that measured in the reference thermometer.