Thermo Fisher Scientific Ion Selective Electrodes Iodide - Manual (Page 15)

Instruction Manual Iodide Electrode
15
TROUBLESHOOTING HINTS
Symptom Possible Causes
Next Step
Out of Range defective meter check meter with shorting strap
Reading (see meter instruction manual)
defective electrode check electrode operation
electrodes not unplug electrodes and reset
plugged in properly
reference electrode be sure reference electrode
not filled is filled
air bubble on membrane remove bubble by redipping
electrode
electrodes not put electrodes in solution
in solution
Noisy or Unstable
defective meter check meter with shorting strap
Readings (readings
continuously or
air bubble on membrane remove bubble by re-dipping electrode
rapidly changing)
electrode exposed soak electrode in iodide standard
to interferences
defective electrode replace electrode
ISA not used use recommended ISA
meter or stirrer ground meter or stirrer
not grounded
Drift (reading
samples and standards allow solutions to come to room
slowly changing at different temperatures temperature before measurement
in one direction)
electrode exposed check section entitled
to complexing agents
Complexation
incorrect reference use recommended
filling solution filling solution
Low Slope or
standards contaminated prepare fresh standards
No Slope or incorrectly made
ISA not used use recommended ISA