Denver Instrument UltraBasic Operating Instructions Manual
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16Troubleshooting1. When the signal from the electrode is out ofrange, the display shows “- - -”. This mayindicate that the electrode is not in solution.2. When the meter detects an error in the tempera-ture probe, the display shows - - -. If you do notuse a temperature probe, the meter applies thedefault temperature value, 25°C.3. When an error in electrode response is detected,the display shows Electrode Error. Duringstandardization, this message indicates that theelectrode exhibits less than 90% or more than105% of the correct response. The ElectrodeError message can indicate a bad electrode orbad buffer(s).4. To test the pH electrode, place it in a good pH 7buffer. Press mode to activate the mV mode,and note the millivolt reading. Make sure themeter is in mV mode and not relative mV mode.Repeat the procedure with either a pH 4 or pH 10buffer. The electrode signal must be within thelimits shown below (with the temperature near25°C).5. To test the meter for correct operation, installthe BNC (input) shorting cap. Press mode toselect the mV mode, and note the mV reading.Make sure the meter is in mV mode and notrelative mV mode. If the meter reads 0 ± 0.3 mV,it is measuring correctly. Note that a long-termdrift of 0.1 mV/month since the most recentstandardization is specified.Electrode TestpH 7 0 ± 30 mVpH 4 159 to 186 mV more than pH 7pH 10 159 to 186 mV less than pH 7pH°CSstandardizesetupentermodeError4 7pHstandardizesetupentermode |
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