Maintenance and troubleshooting 81Electronics temperatureTo confirm the actual electronics temperature:1 Select Diagnostics > Device Status > Electronic Temp. > Electronic Temp..The electronics temperature is indicated.2 Press Back to return to the Device Status menu.Minimum/maximum electronics temperature recordedTo obtain the minimum and maximum electronics temperature recorded:1 Select Diagnostics > Device Status> Electronic Temp. > Min Electronic Temp. or Max ElectronicTemp..The minimum or maximum electronics temperature recorded is indicated.2 Press Back to return to the Device Status menu.Resetting the minimum/maximum electronics temperature recordedTo reset the minimum and maximum electronics temperature recorded:1 Select Diagnostics > Device Status > Electronic Temp. > Reset Min/Max.2 Press OK to reset the values.3 Press Back to return to the Device Status menu.Total run timeTo confirm the total instrument run time:1 Select Diagnostics > Total Run Time.The total run time of the instrument is indicated.2 Press Back to return to the Device Status menu.Performing a self-testSelf-tests are used to compare the electrical signature of the instrument's PCBs with a factory"thumbprint". This test is usually performed every two to three years to confirm SIL compliance)To perform the self-test:1 Select Diagnostics > Self Test > Start Self Test > OK.2 Press Back once the test is completed (the progress bar has returned to its "empty" state). Youreturn to the Self Test screen.3 From that screen, select Result Seft Test. The result of the self test appears (Ok, Not OK or CheckNot Done).If the result is Not Ok, other errors have most likely happened and you should investigate thediagnostics history more carefully.If the result is Check Not Done, it is likely due to the electrical thumbprint having been erased duringa firmware update. This does not preclude your instrument from working properly.Setting distance calibration parametersLWT300 probes are calibrated before leaving the plant. ABB service personnel will inform you if distancecalibration needs to be performed.