Hanna Instruments HI 98186 Instruction Manual

Also see for HI 98186: Instruction manual

Hanna Instruments HI 98186 Instruction Manual Manual pdf 51 page image

51TEMPERATURE CALIBRATIONTEMPERATURE CALIBRATIONTEMPERATURE CALIBRATIONTEMPERATURE CALIBRATIONTEMPERATURE CALIBRATION((((( for technical personnel onlyfor technical personnel onlyfor technical personnel onlyfor technical personnel onlyfor technical personnel only )))))All the instruments are factory calibrated for temperature.Hanna’s DO probes are interchangeable and no temperature calibration isneeded when they are replaced.If the temperature measurements are inaccurate, temperature recalibrationshould be performed.For an accurate recalibration, contact your dealer or the nearest HannaCustomer Service Center, or follow instructions below.The temperature calibration can be performed in 1 or 2 points.It is better to perform a 2 points calibration.The calibration can be performed in any two points that have at least 25 ºCdistance between. It is recommended that the first point be near 0 ºC and thesecond point near 50 ºC.Press CAL from any measure mode (DO, BOD, OUR or SOUR).The calibration menu will be displayed.Press the T functional key to select the temperature calibration.• Prepare a vessel containing ice and water and another one containing hotwater (at approximately 50 °C or 122 °F). Place insulation materialaround the vessels to minimize temperature changes.Use a calibrated thermometer with a resolution of 0.1 °C as a referencethermometer.• Connect the DO probe to the appropriate socket.• Immerse the DO probe into the vessel with ice and water as close as possibleto the reference thermometer.• Allow a few seconds for the probe to stabilize.