Watts HF scientific 28030, Owner'S Manual

Page: 34 / 45

CLX-XT (28652) Page 28
REV 5 (5/2020)
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 9.5). 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.
9.2 Setting Flow Rate
The flow rate on the CLX-XT was factory adjusted and usually should not need
adjustment. Installation variances may affect the flow. The optimal flow rate through the
CLX-XT 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. CLX-XT 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.
9.3 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). The Water Calibration occurs automatically at the completion
of the 75 PRIME stokes.