Thermo Fisher Scientific Ion Selective Electrodes Potassium - Manual (Page 16)

Instruction Manual Potassium Electrode
16
Drift (reading
samples and standards allow solutions to come to room
slowly changing at different temperatures temperature before measurement
in one direction)
electrode exposed soak electrode in potassium
to interferences standard
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
standard
used as ISA use ISA
defective
electrode check electrode operation
electrode
exposed soak electrode standard
to interferences in potassium
air bubble on membrane remove bubble by redipping probe
Noisy or Unstable
defective meter check meter with shorting strap
Readings (readings
continuously or air bubble on membrane remove bubble by redipping
randomly changing) electrode
defective
electrode replace electrode
electrode exposed soak electrode in potassium
to interferences standard
meter or stirrer ground meter or stirrer
not grounded
outer filling solution fill electrode to level just
level too low below fill hole