OHAUS ST300, Service Manual, Page: 22 / 29

CHAPTER 4 RESET TO FACTORY SETTINGS
Ohaus Corporation www.ohaus.com 3-2 Starter Series Portable Meter Service Manual
3.2 Error message
3.2.1 Error message ST300
Error 0 Memory access error Reset to factory settings
Error 1 Self-diagnosis failed Repeat the self-diagnosis procedure
and make sure that you finish pressing
all five keys within two minutes.
Error 2 Measured values out of
range Check if the electrode is properly
connected and placed in the sample
solution.
Error 3 Measured buffer
temperature out of range
(<5 or >40 °C) Keep the pH buffer temperature within
the range for calibration
Error 4 Offset out of range
offset > 60mV or < - 60 mV Make sure the pH buffer is correct and
fresh; Clean or replace the pH
electrode.
Error 5 Slope out of range Make sure the buffer is correct and
fresh; Clean or replace the pH
electrode.
Error 6 Meter cannot recognize the
buffer Make sure the buffer is correct and
fresh; check if the buffer has not been
used more than once.
Error 9 The current data set has
already been stored once An endpoint reading can only be stored
once. Perform a new measurement to
store.
3.2.2 Error message ST300C
Error 0 Memory access error Reset to factory settings
Error 1 Self-diagnosis failed Repeat the self-diagnosis procedure
and make sure that you finish
pressing all five keys within two
minutes.
Error 2 Measured values out of
range Check if the electrode is properly
connected and placed in the sample
solution.
Error 3 Measured buffer temperature
out of range (<5 or >40 °C) Keep the pH buffer temperature
within the range for calibration
Error 4 Offset out of range
offset > 60mV or < - 60 mV Make sure the pH buffer is correct
and fresh; Clean or replace the pH
electrode.
Error 9 The current data set has
already been stored once An endpoint reading can only be
stored once. Perform a new
measurement to store.
TABLE 3-1. ST300 Error Message.
TABLE 3-2. ST300C Error Message.