OHAUS ST300, Service Manual, Page: 23 / 29

CHAPTER 3 RESET TO FACTORY SETTINGS
Starter Series Portable Meter Service Manual 3-3 Ohaus Corporation www.ohaus.com
3.2.3 Error message ST300D
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 Make sure that the electrode setting
cap has been removed and the
electrode is properly connected and
placed in the sample solution.
Error 3 Measured buffer temperature
out of range (<0°C or >50 °C) Keep the standard buffer
temperature within the range for
calibration or measurement.
Error 4 Cal 2 out of range Make sure the buffer is correct and
fresh;
Clean or replace the DO electrode.
Error 5 Cal 1 out of range Make sure the buffer is correct and
fresh;
Clean or replace the DO electrode.
Error 9 The current data set has
already been stored once A measurement can only be stored
once. Perform a new measurement
to store a new data set.
3.2.4 Error message ST400D
Low battery If low battery, the battery icon will blink to show need new
battery. Then turn off after 10 seconds.
Communication fail When do calibration or new cap parameter input, meter will
detect if the probe is connected properly. If not, meter
displays " Fail, please confirm the STDO21 probe is
connected
”
Measured temperature out
of range (< -5°C or >55 °C) Meter will display "Temperature Out of Range!"
Please keep the sample temperature within the range for
measurement.
Calibration out of range Meter displays "Calibration Fail".
|K-1| >0.4 or a |B| >0.1
You may need to do a proper calibration again, if calibration
data is still not good, you may need to replace a new probe
cap or probe.
TABLE 3-3. ST300D Error Message.