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Section 6 Maintenance
DANGER
Only qualified personnel should conduct the maintenance tasks described
in this section of the manual.
6.1 Maintenance Schedule
Scheduled periodic maintenance requirements of the 1720E are minimal and
include calibration and cleaning of the photocell window, bubble trap, and body.
Check and clean the bubble trap and turbidimeter body (as described in
section 6.4.3) if visual inspection shows that it is necessary. Perform other
maintenance on a regular basis; experience will dictate scheduling and may
depend on the installation, sample type, and season.
It is very important to maintain the cleanliness of the interior and exterior of the
turbidimeter body, head assembly, the integral bubble trap, and the surrounding
area. Doing so will ensure accurate, low-level turbidity measurements.
Clean the body before calibration and verification (especially when measurements
are being made at 1.0 NTU or lower).
Check and/or perform a calibration periodically (as experience dictates) using one
of the methods described in section 5.3 on page 40. A calibration history menu
option is available under Sensor Setup/Calibrate.
6.2 Removing a Sensor from the System
Prior to physically removing a sensor from the system, record all user defined
settings such as relays, signal averaging, etc. Disconnect the sensor connector at
the controller.
6.3 Reinstalling a Sensor on the System
To return the system to normal operation following a software upgrade or sensor
repair perform the following procedure:
1. Detach all sensors from the sc100 controller.
2. From the main menu, press the down arrow key to highlight TEST/MAINT.
Press ENTER.
3. Use the down arrow key to scroll to SCAN SENSORS and press ENTER.
4. Remove attached sensors by selecting the corresponding serial number or
select “All”.
5. Power down the sc100 then attach the 1720E.
Note: Clean sensors before
reinstallation on the system.
6. Supply power to the sc100. The system will initialize automatically.
Maintenance Task Frequency
Clean the sensor
Before each calibration and as needed. Depends on sample
characteristics.
Calibrate Sensor (as required by regulatory agency) Per agency-dictated schedule.
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