Thermo Orion Star - ISE Events;Errors

Thermo Electron CorporationXIII-4 Orion Star Series Meter
Care and Maintenance
ISE Events/Errors
Error
Code
Description
Press
to Clear
Cause Trouble Shooting
306 ISE Blank Error Yes The meter is unable to
calculate a blank value.
This error occurs when
Auto Blank is enabled
in setup and a three or
more point calibration
has been performed,
when one solution
has been defined as
zero concentration
and the actual
concentration of the
blank is substantially
greater then the least
concentrated standard.
This can also occur
during a one or two
point calibration if one
of the standards is
defined as zero.
• Check to make sure electrodes
were placed in the proper
standards and blank solution
and recalibrate.
• Repeat calibration using fresh
standards and blank solution.
• Repeat using two standards
of known concentration other
then zero.
307 ISE Calibration
Standard Error
Yes The milivolts being
measured are the
same for two different
standards.
• Check that the two different
standards are being used and
that the electrode is in the
correct standard.
• Make fresh standards and
repeat the calibration.
309 Bad ISE Slope Yes The pH slope is
not in the range of
- 99 to + 99 mV/Decade
• Repeat calibration using fresh
standards
• Clean electrodes and refill
reference electrode
• Refer to electrode instruction
on how to check electrode