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If, after performing the above procedures, the probe cannot be calibrated or the meter gives an error message,
the probe probably needs to be replaced. Keep in mind that it can take as many as 3 minutes for the probe to
complete one of the calibration segments. Please answer the following questions so we can better determine
whether a return authorization should be issued.
Background information
1. Serial number of the probe. The serial number is written on a label near the connector end of the probe.
2. What type of sample is being analyzed?
3. How frequently is the probe used?
4. Describe in detail how the probe failed and what was done to troubleshoot the probe.
5. How is the probe stored when not in use?
6. Describe exactly how the probe is cleaned? How often is the probe cleaned?
7. Are the buffer solutions fresh?
8. What mV reading does the probe give in fresh pH4 and pH7 buffer solutions? Voltage is one of the readout
modes on the IQ 150 meter.
