Start-Up And Preventive Maintenance; Replacing Pump Head And Tubes - Blue I HydroGuard HG-302 Manual De Uso

5. Drain the flow cell completely by opening the sampling valve on the bottom. Leave the valve in the
open position to allow air to completely dry the cell.
6. Remove the reagent bottles and flush each pump tube by inserting the pump tube in a container of
fresh water and pressing the pump button for at least 90 seconds.
7. Remove the pump tubes from the water containers and press the pump button for an additional 90
seconds to remove any water.
8. With the solenoid valve in the open position, turn off the power to the controller. If the solenoid is in
the close position, the unions at the top and bottom of the solenoid should be loosened to allow the
colorimeter and solenoid to completely drain.
9. Check the security of the controller doors to ensure a weatherproof seal.
5.5

Start-up and Preventive Maintenance

After the controller (or flow) has been off for a long period of time (> 2 weeks), a few simple checks should be
done during the initial start-up. Several components may need to be cleaned and some mechanical parts
may be replaced as preventative maintenance.
1. Remove the colorimeter cap and clean the quarts glass using a cotton swab.
2. Remove the solenoid and check the tip for corrosion (this may occur if shut down improperly) and
check the plastic stop for deterioration. The corrosion can usually be cleaned away and the solenoid
will continue to work properly. After start-up, confirm that the water is completely stopped when the
solenoid shuts. If not shutting properly, it must be cleaned or replaced.
3. Inspect the pump tubes for cracks or signs of significant wear and replace if necessary (see 5.5.1).
4. Install new reagents and press the pump button for 90 seconds to prime the tubes.
5. Inspect the pump needles (in the colorimeter cap) to ensure that droplets are forming and falling
properly. Replace if necessary.
6. Replace probes in the flow cell, close the sampling valve and turn on flow immediately to re-wet the
probes.
7. Recalibrate the controller: Cl, ORP, pH. ORP and pH will likely require 24-48 hours to re-stabilize
and will require re-calibration at this time.

5.5.1 Replacing Pump Head and Tubes

If the pump head and/or tubes are cracked, appear significantly worn, or are no longer functioning
properly, they should be replaced to ensure consistent operation and control.
1. Turn off the power to the HydroGuard controller
2. Remove the tubes from pump head and the needles in the colorimeter cap by holding the top of
each needle and pulling the tube gently
3. Remove the tubes from the regent bottles and wipe off any excess reagent (the DPD will stain so be
careful)
4. Unscrew the two (2) screws on the face of the pump head. Save the screws.
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