Thermo orion 410Aplus, Instruction Manual

Page: 77 / 129

Benchtop pH/ISE Meter Instruction Manual
Troubleshooting 76
Problem Probable Cause Remedy
Trouble Some electrodes Perform a manual calibration
Calibrating in may operate outside
Autocalibration the limits of ± 0.5 Buffers used may be
pH units. out of specification.
Repeat calibration
using fresh buffers or from a
different lot.
Meter display Meter failure For Models 420Aplus,
Locks 710Aplus, reset meters as
described in set-up menu 2-4.
For Models 520Aplus,
525Aplus, 720Aplus
920Aplus, unplug meter,
hold 0 key down and plug
meter in. Press yes at the
prompt “RESET METER?”