ELGA PURELAB UHQ II & PS Service Manual
PURELAB UHQ II & PS Service issue 2 03/07
15
7. TROUBLE SHOOTING
The table below gives guidance on what action to take should any problems arise. This
section should be used in conjunction with the Operator’s Handbook.
Problem
Cause
Action
Unable to
attain 18
M
Ω
.cm
•
Cartridges
exhausted
•
Recirculation
pump
•
Line cell
•
Calibration
•
UMF (UHQ7)
contaminated
•
Insufficient rinse
following
sanitization.
•
Check UHQ1 and UHQ2 are correctly installed:
UHQ1 be in front of UHQ2
Check arrows on cartridges are pointing in
direction of recirculation flow.
Check feed water for quality and CO
2
content.
Note: CO2 in feed water will increase ionic loading
on the UHQ1 and 2 cartridges.
•
Check dispense flow rate is >700 ml/min.
If <700ml/min replace with PUMP11647
(PUMP11855 – 110 v version)
•
Remove line cell and clean with nylon brush.
•
If faulty replace with SP292
•
Carry out re-calibration of line cell circuit – see
section 9.
•
Replace UHQ7.
•
It is very important to rinse all traces of chemicals
from the unit before connecting the UHQ1 & 2
following a sanitization. (see appendix C)
No flow (or
very low flow)
from
dispense
pen.
•
Recirculation
pump
•
Restriction in
tubing
•
Dispense pen
•
Composite vent
filter (UHQ4)
wetted
•
Replace with PUMP11647 (PUMP11855 – 110 v
version)
•
Check all tubing for kinks and re-route if
necessary.
•
Replace SP384 if faulty.
•
If the reservoir is overfilled the composite vent
filter will be wetted and this will prevent air
entering or escaping the reservoir causing an
internal vacuum or pressure build-up which will
adversely affect the dispense. Replace UHQ4.
Note: Once wetted the UHQ4 must be replaced as it
cannot be dried out successfully and re-used.
Problem
Cause
Action
•
UMF (UHQ7)
blocked or
contains air
•
Bleed UHQ7 from bleed valve or replace.
Reservoir not
filling
•
Inlet solenoid
valve
•
In UHQ II replace with:
