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CSLD Troubleshooting
CSLD Alarms
ALARM: PERIODIC LEAK TEST FAIL
This message is posted when CSLD data indicates a high probability that a tank is leaking. The threshold for this
determination is shown below,
Single Tanks:
PD - 95% = -0.17 gph
PD - 99% = -0.16 gph
Manifolded Tanks:
PD - 95% = -0.16 gph
PD - 99% = -0.15 gph
Review the CSLD Rate Table leak rates (Leak Rate). If the rates are not consistent (-0.83, +0.06,-0.90, -0.62, etc.)
most likely the tank is not leaking.
Possible reasons for this message:
1. Tank is leaking.
2. CSLD is not recognizing the start of a busy period soon enough. These conditions are caused by small and/or
slow dispenses, as in the case of operation with blenders. The solution would be to install a Pump Sense
Module.
3. An external device is periodically turning On the pump power. This usually results in large negative leak rates. A
Pump Sense Module will solve this problem.
4. Coefficient of expansion programmed incorrectly.
5. Tank is manifolded but programmed incorrectly.
6. Excessive compensation. Check in the IA5200 report for excessive compensation by comparing the
compensated value (LRATE) to the uncompensated value (AVLRTE). The most likely cause of excessive
compensation is bad probe temperature readings.
7. Stuck floats. Install a collar on the probe shaft to prevent floats from entering riser.
8. Floats damaged or installed incorrectly.
9. A stuck relay is causing the pump to run continuously. This causes the fluid to heat up around the pump
producing temperature compensation errors.
10.Excessive evaporation due to an air leak into the tank may be the cause of a periodic leak test failure. Check
vapor recovery system, pressure vent cap, all tank sump areas and riser caps, delivery sump plunger valve, etc.
STATUS MESSAGE: NO RESULTS AVAILABLE
This message may print when the CSLD Test Results are printed or accessed via the RS-232 command. This
message indicates that CSLD has not collected sufficient test data to determine whether or not the tank is leaking,
and is normal until 7 -10 days AFTER a CSLD startup. The program must be allowed to build a suitable database
to calculate reliable results. At highly active sites some tanks may provide results before others. The busier tanks
will take longer to produce the initial results.
Possible reasons for this message:
1. Not enough time after startup to generate results.
2. Console is being shut Off on a regular basis.
3. Tank too busy.
