Thermo Fisher Scientific Ion Selective Electrodes Ammonium - Manual (Page 20)

Ammonium Electrode Instruction Manual
14
Low Slope or
standards contaminated prepare fresh
No Slope or incorrectly made standards
ISA not used use recommended ISA
standard used as ISA use ISA
defective electrode check electrode
operation
electrode exposed soak electrode
to interference in ammonium standard
air bubble on membrane remove bubble by
redipping probe
Noisy or Unstable
defective meter check meter with
Readings (readings shorting strap
continuously or
randomly changing) air bubble on remove bubble by
membrane redipping electrode
defective electrode replace electrode
electrode exposed soak electrode
to interference in ammonium standard
meter or stirrer ground meter or
not grounded stirrer
outer filling solution fill electrode
level too low to level just below fill hole