Xylem CL500 ONLINE CHLORINE ANALYZERS - Manual (Page 27)

CL500 (2/08) Page 23
REV 2.0
9.0 Troubleshooting
9.1 CL500 Fault Detection
The CL500 performs continuous diagnostic monitoring. In the CL500, there are 4 severity
levels of fault detection. Level 4, 3 & 2 will allow normal operation, but warn of the
problem. Level 1 is an instrument failure and the instrument will not operate. Any faults
are displayed in a queue form in the bottom row of the LCD.
A level 4 fault is simply a screen indication that one of the alarm levels has been
activated. This fault level will not affect the 4-20 mA and will only affect the alarm
activated. The sample back light blinks at a rate of once every 4 seconds.
A level 3 fault indicates a failure or a problem that usually can be corrected by the
operator. Refer to the chart below. If any of these errors occur, the instrument will still
display readings and probably will operate correctly. These faults will self-clear when the
problem is corrected. If any of these faults occur, they will affect the 4-20mA and any
alarm set for fault detection (Error). The sample back light blinks at a rate of once every
2.5 seconds.
Level 3 (Self-Clearing) fault conditions
Message Description of Fault Corrective Action
MA 4-20 mA enabled & loop open Check 4-20 mA wiring or turn off 4-
20mA if not used
CAL Calibration invalid –not accepted Recalibrate if needed
WATR No water flowing Check water flow
FAST Intake water flow too fast Set flow rate (see section 9.2)
SLOW Sample cuvette filling too slowly Set flow rate (see section 9.2)
PURG Sample cuvette has slow purge Check drain lines
NPRG Sample cuvette not purging Check drain lines
ISOL Problem with intake solenoid Check wiring, check for clogged solenoid
PSOL Problem with purge solenoid Check wiring, check for clogged solenoid
RGNT Problem with reagent Check reagent and lines
GLAS Dirty cuvette Replace or clean cuvette
WCAL Water Level Calibration Invalid Clear fault (see section 9.3)
REPL Reagents Expired Replace reagents and press PRIME
A level 2 fault indicates a severe problem that will usually require technical assistance
from Global Water’s customer service (see section 9.5). The queued display will show
POST. If this fault occurs it will affect the 4-20mA and any alarm set for fault detection
(Error). The sample back light blinks at rate of once every 1 second.