Xylem TB500 ONLINE TURBIDITY ANALYZERS - Manual (Page 32)

TB500 (2/07)
Rev. 1.0 28
9.3 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 10.2
Lower display shows LAMP Lamp failed Replace lamp. Refer to section
10.3
Lower display shows FLOW Sample flow has stopped Restore flow. Contact GW
about factory installed option
Lower display shows FAIL Major system fault Refer to section 9.1 & 9.2
Readings are higher 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 GW.
Part# 20106GW
Check flow through cuvette for
condensate or leaks.
Clean cuvette. See section 10.1
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
Upper display flashes Sample Over-Range Check sample. Sample may be
too high to read.
9.4 Technical and Customer Assistance
If for any reason assistance is needed regarding this instrument please do not hesitate to
contact 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]
www.globalw.com