Watts 28034, Operation And Maintenance Manual

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Please note that these operating screens cannot be seen
except through the door window with the cabinet door
closed or in maintenance bypass mode. See section 5.3
for more information on this.
The CLX-Ex2 performs continuous diagnostic monitoring. In the
CLX-Ex2, there are 4 severity levels of fault detection. Level 4, 3 and
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 may affect the 4-20mA and
any alarm dependent on the detection setting (Error). See sections 8.2
and 8.4.1 for error settings. The sample back light blinks at a rate of
once every 2.5 seconds to indicate these faults.
Level 3 (Self-Clearing) fault conditions
Message Description of Fault Corrective Action
MA 4-20 mA enabled and 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 10.2)
SLOW Sample cuvette filling too slowly Set flow rate (see section 10.2)
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
GLAS Dirty cuvette Replace or clean cuvette
WCAL Water Level Calibration Invalid Clear fault (see section 10.3)
A level 2 fault indicates a severe problem that will usually
require technical assistance from HF scientific customer
service (see section 10.6). 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 10.6). 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 will show a four or five digit fault 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 condition occurs, the message indicating the fault will be
shown on the lower row of the display.
10.2 Setting Flow Rate
The flow rate on the CLX-Ex2 was factory adjusted and usually should
not need adjustment. Installation variances may affect the flow. The
optimal flow rate through the CLX-Ex2 may be adjusted if needed.
The flow is adjusted by removing regulator vinyl cap and turning the
adjustment screw on the pressure regulator. To assist in this adjustment
follow the procedure shown below:
1. Press the
SERVICE button.
2. Wait for the display to read HOLd, then press Mode/ Exit .
3. Display will show FLOW with the number 0. Press either the  or 
button.
4. CLXB will drain, and then pulse in water while a count is displayed
on the screen.
5. The display will show one of three messages HI, LO or Good.
The flow test determines if the flow rate is suitable for proper operation.
Loosen the locking nut then adjust the pressure regulator using a coin
or a large flat blade screwdriver. Press either the  or  button while
in the FLOW routine to display a new flow rate. Please note that only ¼
turn incremental adjustments should be made to the regulator on
each attempt.
If the message is LO, turn the regulator control clockwise. If the
message is HI, turn the regulator counterclockwise. If the message
is Good, no adjustment is required. Tighten the locking nut after
adjustment and replace the regulator vinyl cap. To return to normal
operation, press the

button.
10.3 Clearing Faults
Every time SERVICE mode is exited, all faults are cleared. If the original
fault or a new fault occurs, it will be posted.
In the case of WCAL, it is possible the power was enabled before a
water sample was available. Ensure a water sample is available and
then press PRIME to force another Water Calibration (WCAL).
10.4 Reagent Clogs
If reagents fail to flow or Prime it may be due to a clog in
either the tubing or at a check valve. To alleviate this you
may have to flush the system with Chlorine Free water,
preferably Deionized water. See section11.4
Check Valve
Flushing Kit.
Only access when the atmosphere has been tested and known to
be safe.
WARNING
!
10.0 Troubleshooting
10.1 CLX-Ex2 Fault Detection