Autosampler Fault

Poor area reproducibility is caused by varying amounts of sample being injected.

Possible causes of failure:

  • Worn syringe
  • Sample carryover (needle seat)
  • Metering device
  • Faulty / worn switching valve
  • Leaks inside the autosampler (e.g. Alliance autosampler leaks are not always immediately apparent)
  • Seal leaks – some are more visible than others
  • Leaks on the sampling side do not always show pressure changes