YSI 2900 - Page 145

144
POSSIBLE CAUSE: Newly installed enzyme Membrane.
ACTION: Enter probe service and check probe currents.
SECTION: 7.2.3 Modules
POSSIBLE CAUSE: Newly installed probe.
ACTION: Enter probe service and check probe currents.
SECTION: 7.2.3 Modules
POSSIBLE CAUSE: Calibrator solution out of spec: contaminated or installed
for more than 30 days.
ACTION: Install new calibrator.
SECTION: 4.8 Install Calibrator Solution(s)
POSSIBLE CAUSE: Failing enzyme Membrane.
ACTION: Enter probe service and check probe currents. Replace Membrane(s) if
necessary.
SECTION: 5.1 Perform Daily Operational Checks, 4.9 Install Membranes and ISEs
POSSIBLE CAUSE: Probe surface fouled.
ACTION: Clean probe surface.
SECTION: 9.4.3 Enzyme Probe Cleaning
POSSIBLE CAUSE: Auxiliary electrode fouled.
ACTION: Clean Auxiliary electrode surface (temperature probe) with isopropyl alcohol.
POSSIBLE CAUSE: Sample concentration too high, resulting in high probe
current (nA).
ACTION: Dilute sample or adjust sample size down and repeat.
SECTION: 8.1 Sample Volume
SYMPTOM: MEASUREMENT ERROR: PL Slope
POSSIBLE CAUSE: Stir speed too fast or too slow.
ACTION: Adjust stir speed.
SECTION: 7.2.4 Stirbar
POSSIBLE CAUSE: Newly installed enzyme Membrane.
ACTION: Enter probe diagnostics and check probe currents.
SECTION: 7.2.3 Modules
POSSIBLE CAUSE: Newly installed probe.
ACTION: Enter probe diagnostics and check probe currents.
SECTION: 7.2.3 Modules
POSSIBLE CAUSE: Failing enzyme membrane.
ACTION: Replace membrane.
SECTION: 5.1 Perform Daily Operational Checks, 4.9 Install Membranes and ISEs
POSSIBLE CAUSE: Enzyme Probe surface fouled.
ACTION: Clean probe surface.
SECTION: 9.4.3 Enzyme Probe Cleaning
POSSIBLE CAUSE: Auxiliary electrode fouled.
ACTION: Clean Auxiliary electrode surface (temperature probe) with isopropyl alcohol.
SYMPTOM: FLUID ERROR: Check Bottles
POSSIBLE CAUSE: Low buffer or calibrator level.
ACTION: Check bottle status at bottom of Sample screen. Refill the appropriate bottle.
SECTION: 4.7 Prepare and Install Buffer Solution, 4.8 Install Calibrator Solution(s)
POSSIBLE CAUSE: High waste level.