HF scientific CLX Online Residual Chlorine Monitor (Old) - Manual (Page 29)

CLX (9/07) Page 23
REV 3.1
9.0 Troubleshooting
9.1 CLX Fault Detection
The CLX performs continuous diagnostic monitoring. In the CLX, 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.
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 4.2.1)
SLOW Sample cuvette filling too slowly Check water flow
PURG Sample cuvette has slow purge Check drain lines
NPRG Sample cuvette not purging Check drain lines
H2O CLX cannot determine water level Check water flow
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 9.2)
REPL Reagents Expired Replace reagents and press PRIME
A level 2 fault indicates a severe problem that will usually require technical assistance
from HF scientific customer service (see section 9.4). 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.
A level 1 fault is a system fault. This is NOT a problem that the operator can correct, and
the unit must be returned to the factory for service (see section 9.4). These failures consist
of failures in the CPU, A/D, EEPROM or other devices internal to the instrument. The
queued display will show FAIL, the upper display is a five digit code. If this fault occurs,
it will affect the 4-20mA and any alarm set for fault detection (Error). The instrument will
not operate with this fault. The sample back light blinks at rate of once every 0.4 seconds.
If any fault conditions occur, the message indicating the fault will be shown on the lower
row of the display.