HF scientific MicroTOL Online Turbidimeter - Manual (Page 35)

MICRO TOL (5/10) 29
Rev. 4.8
9.0 Troubleshooting & Maintenance
9.1 Micro TOL Fault Detection
The Micro TOL performs continuous diagnostic monitoring. In the Micro TOL 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. How these faults are indicated depends on the
settings made in sections 7.3 Configuring the Error Level and 7.5 Configuring the
Alarms. If ERLV is set to OFF and Alarms are not set to Error, there will be no remote,
indication of a problem.
If the desiccant alarm is turned off and the desiccant becomes saturated only a screen
warning of DESC will appear and no alarms are activated. Another warning of ALM1
or ALM2 is displayed if an alarm is set and the threshold is exceeded.
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 and no flow FLOW (if equipped with the flow switch).
• If the Micro TOL 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 errors occur the instrument will still display readings, however the accuracy
is not known and the instruments readings may not be reliable.
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.
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 HF scientific Technical Service Department or the HF scientific Customer Service
Department.
HF scientific
3170 Metro Parkway
Fort Myers, Florida 33916-7597
Phone: (239) 337-2116
Fax: (239) 332-7643
Toll free: 888-203-7248
Email:[email protected]
www.hfscientific.com