HF scientific 19944 Triple Validation Turbidimeter - 0-100 NTU - Manual (Page 32)

TVT2 (5/02)
Rev. 1.7 (.pdf) 27
When this message is indicated, contact the HF scientific, inc. Technical Services
department to determine a resolution to the problem. The instrument indicates an error
message “SFE” if there is a general electronics failure. Normally, this condition indicates
that the instrument will require servicing; contact either the HF scientific, inc. Technical
Service Department or the HF scientific, inc. Customer Service Department.
If an error condition occurs, the system alarm relay will automatically be set to the alarm
position, the analog output will be set to 2 mA and the ERROR block will be highlighted.
9.3 Technical and Customer Assistance
If for any reason you need assistance regarding this instrument please do not hesitate to
contact either the HF scientific, inc. Technical Service Department or the HF scientific,
inc. Customer Service Department:
HF scientific, inc.
3170 Metro Parkway
Fort Myers, Florida 33916-7597
Phone: (239) 337-2116
Fax: (239) 332-7643
Email: [email protected]
10.0 Routine Maintenance
10.1 Cleaning the Optical Chamber (Sample Tube)
Proper measurement of turbidity requires that the sample tube be free of debris. Cleaning
the sample tube is accomplished by first purging the system:
1. Stop the flow of sample water to the instrument.
2. Remove the cleanout plug and then clean the interior of the sample tube with the
brush provided by HF scientific, inc. If necessary, you may use any common non-
abrasive detergent to help in the removal of any residual buildup on the sample tube.
3. Allow the sample tube to drain and then re-attach the flow of sample water to the
instrument. Allow enough sample water to flow through the instrument to achieve a
stable reading prior to placing the instrument back into routine operation.
10.2 Replacing the Desiccant Cartridge
Proper use of the supplied desiccant cartridge is essential in maintaining the performance
of the instrument. The desiccant cartridge has been designed to have a long life.
Replacement of the desiccant cartridge may be needed if water enters the enclosure, or if
the enclosure is opened for an extended period. It is also essential that all enclosure seals
are maintained. The desiccant cartridge should be replaced when the color of the
desiccant (as viewed through the sight glass) has turned pink.
The desiccant cartridge is located on the lower right side of the front display of the
instrument (see Figure 6). To remove the old desiccant cartridge, simply unscrew the
cartridge from the front of the case by rotating the cartridge counter-clockwise (see
Figure 6). Once removed, place the new cartridge into the instrument with the reverse
movements. Then continue using the instrument as normally instructed.