Xylem TB500 ONLINE TURBIDITY ANALYZERS User Manual

Page 31

TB500 (2/07)
Rev. 1.0

9.0 Troubleshooting & Maintenance

9.1 TB500 Fault Detection
The TB500 performs continuous diagnostic monitoring. In the TB500 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.

An error indicates a failure or a problem that usually can be corrected by the operator.
These errors consist of lamp out (LAMP), 4-20 mA loop open (MA), bad calibration
(CAL), if desiccant alarm activated and replacement required (DESC), if enabled no flow
(FLOW) (if equipped with the flow switch). If the TB500 is equipped with ultrasonic
cleaning, 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.

9.2 System FAIL Message
Normally, this condition indicates that the instrument will require servicing. Contact either
the Global Water’s Technical Service Department or the Global Water’s Customer Service
Department.

Global Water Instrumentation

11390 Amalgam Way

Gold River, CA 95670

Phone: (800) 876-1172

Fax: (847) 672-9988

Email:

[email protected]