Cell current shows large continuous drift
A large drift in baseline is noticed.
Malfunctioning reference electrode, for example because of air in the REF compartment of the salt bridge or poor connection in the cell cable. Also a sudden contamination could cause this.
- Perform a dummy cell test, if not passed it is most likely an electronic malfunction (or cell cable, see below)
- Perform a stop flow test to rule out contamination of some sort
- In case an Analogue Data Output is used with an AD convertor (i.e. not using the digital data via Clarity): connect both wires from the detector with a + (signal) and – (shielding) of the AD-convertor. In some cases the AD convertor has an additional ground pin. But this might be a “floating” ground resulting in drift.
Related to reference electrode, or cell cable:
- Maintenance of reference electrode (salt bridge), double check for bubbles, remove air/bubbles if those are visible
- In case of ISAAC/HyREF check the electrode looks clean. ISAAC is dark brown/grey. The HyREF should have a metal shine. Polish the inlet block with the REF and apply maintenance as in the manual if needed.
- Install the REF properly, without including air in the block cavity (salt bridge) or cell.
- Look for sign of corrosion on connectors, replace cell cable.
- Incorrect detector settings, method not optimized.