Section 6 maintenance, 1 maintenance schedule, 2 removing a sensor from the system – Hach-Lange 1720E Low Range Turbidimeter User Manual
Page 29: 3 reinstalling a sensor on the system
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Section 6
Maintenance
DANGER
Only qualified personnel should conduct the 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
) 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 turbidimeter body before performing any calibration or wet 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
. 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.