16
10.0 Troubleshooting
10.1 AccUView LED Fault Detection
The AccUView LED performs continuous diagnostic monitoring. In the
AccUView LED there are three levels of fault detection; warnings, errors
and failures. Any faults are displayed in a queue form in the bottom row
of the LCD.
A
warning
is simply a screen indication of a problem. No alarms
are activated. If the desiccant alarm is turned off and the desiccant
becomes saturated, a screen warning of
DESC
will appear. At
power-up for 30 minutes and at operating temperatures outside of our
specifications, the %T or ABS reading may flash. When this happens
the reading may be outside of the stated tolerance.
An
error
indicates a fault or a problem that usually can be corrected
by the operator. These errors consist of lamp low output
(LAMP)
, 4-20
mA loop open
(MA)
, bad 100% T or 0 ABS calibration
(CAL Err)
,
bad temperature compensation calibration
(TECO)
, if desiccant alarm
activated and replacement required
(DESC)
, if enabled no flow
(FLOW)
(if equipped with the optional flow switch). An additional message will
indicate that the ultrasonic transducer is not making contact or the flow
through has been removed
(CLN)
. If any of these conditions occurs,
both alarm relays will be activated and the 4-20 mA output will be held
at 2 mA. If any of these errors occur the instrument will still display
readings, however the accuracy is not known and the instruments
readings should not be trusted.
A
failure
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. These
failures consist of failures in the CPU, A/D, EEPROM or other devices
internal to the instrument
(FAIL)
. If a failure occurs, the instrument will
not function properly and will display the word FAIL on the lower row,
both alarm relays will be activated and the 4-20 mA output will be held
at 2 mA (if 4-20 mA is selected).
If any fault conditions occur, the message indicating the fault will be
shown on the lower row of the display.
10.2 System FAIL Message
Normally, this condition indicates that the instrument will require servicing.
Contact either the HF scientific, Technical Service Department or the
HF scientific, Customer Service Department.
HF scientific
16260 Airport Park Drive, Suite 140
Fort Myers, Florida 33913
Phone: (239) 337-2116
Fax: (239) 454-0694
Email: [email protected]
www.hfscientific.com
10.3 Diagnostic Chart
Symptom
Cause
Cure
Lower display shows
MA
4-20 mA loop open
Check wiring. See sections 3.3.4
and 7.2
Lower display shows
DESC
Desiccant pouch bad
Change desiccant pouch. See
section 9.2
Lower display shows
LAMP
LED failed
Replace lamp. Refer to section 9.3
Lower display shows
FLOW
(if flow option installed)
Sample flow has
stopped
Restore flow.
Lower display shows
CLN
Ultrasonic cleaning
failure
Refer to section 8.2
Lower display shows
CAL
Err
after a calibration.
100% T Calibration
failure
Refer to section 5.2
Lower display shows
TECO
Temperature
Compensation
Calibration failed
Contact HF scientific service dept.
for more information.
Lower display shows
FAIL
Major system fault
Refer to section 10.1 and 10.2
Readings are lower than
expected
(1) Bubbles in solution
(2) Condensate or
leaky cuvette
(3) Flow through
cuvette dirty
Instrument out of
calibration
(1) Ensure that the drain vent is
open and is not obstructed. See
section 3.2.2.
(2) Apply backpressure. See section
3.2 and figure 4
(3) For sever cases of bubbles a
stilling chamber is available. Call
HF scientific.
Part# 20106
Check flow through cuvette for
condensate or leaks.
Clean cuvette. See section 9.1
Recalibrate. Refer to section 5
Readings are erratic
(1) Bubbles in solution
(2) Debris in flow
through
(1) See above
(2) Clean debris from cuvette
Readings are lower than
expected
Instrument out of
calibration
Recalibrate. Refer to section 5
10.4 Technical and Customer Assistance
If for any reason assistance is needed regarding this instrument please
do not hesitate to contact either the HF scientific Technical Service
Department or the HF scientific Customer Service Department. Contact
information is shown on section 10.2.