Chemtrac HydroAct HA4, User Manual

Page: 57 / 97

3.1 UV254 Sensor 57
In the image above, the left side shows the position of the connector. The right side shows the
connections required on the marked connectors.
Disconnect the power before making or breaking electrical connections.
Power to the UV254 Sensor can be provided by the HydroAct 4. Please check that the optional
power supply is fitted in the top left corner of the HydroAct 4 enclosure.
3.1.5 Maintenance
There are several sources of information available to the operator for diagnostics including: diagnostic
LEDs on the main circuit board, system alarms and warning, and raw sensor data. See section 3.1.6
for further details.
3.1.5.1 Cleaning Quartz Flow Cell
The quartz flow cell can be cleaned in acid and/or cleaning solutions to remove residue that has
accumulated on the inside surface. Similar to the calibration methods for the UV254 sensor, cleaning
of the quartz flowcell can be performed using either the in-situ method or the manual method. The
in-situ method is recommended since it is much faster and more efficient.
Cleaning solutions Type of fouling removed
Lactic Acid <20% solution (CLR) Removes lime, calcium, rust, magnesium, and other dissolved
minerals.
Sulfamic Acid <10% solution (Lime
Away)
Removes lime, calcium, rust, magnesium, and other dissolved
minerals.
Phosphoric Acid <30% solution
(Rust Off, Hasagen Blue)
Removes lime, calcium, rust, and color staining.
Citric Acid <20% solution Removes mineral staining.
Sodium Hypochlorite <6% solution
(Bleach)
Removes oil and grease.
Acetic Acid <20% solution Removes mineral staining.
Sulfuric Acid <10% solution Removes mineral staining.
If the power fails (regularly) or the water that is being tested stops flowing (regularly/routinely, eg at
weekends), then use either Lactic Acid and Citric Acid, as described below.
3.1.5.1.1 In-situ quartz flow cell cleaning method
1. Shut off the water supply to the sensor if not already done.
2. Disconnect the 1/4" supply tubing at inlet connection on the sensor.
3. Fill the wash bottle supplied with the cleaning fluid and connect the 1/4" bottle tubing to the inlet
connection on the sensor.
4. Hold a finger over the small vent hole in the center of the wash bottle cap.
5. Squeeze the bottle to get the cleaning fluid to flow through the sensor.
6. Once the fluid starts to flow remove finger from the vent hole and place bottle on top of the
sensor. The fluid should continue to flow through the sensor. If it stops go to step 4.
7. Let all the fluid run through the quartz flow cell until the bottle is empty then disconnect the hose
and bottle from the fitting.
8. Let the fluid remain in the quartz flow cell for several minutes until the quartz flow cell is clean.
9. Connect the supply line to the unit and open the valve to start the flow running.