Chemtrac HydroAct HA4, User Manual

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58 Chapter 3. Sensors
10. Note that it is recommended to recalibrate the sensor at this time.
3.1.5.1.2 Manual quartz flow cell cleaning method and quartz flow cell removal
1. Shut off the sensor and close the water supply.
2. Disconnect both inlet and outlet tubing from the sensor and allow the water to completely drain
from the quartz flow cell before proceeding.
3. Open door of the sensor and place a paper towel or cloth below the flow cell because some
water might still be in the cell.
4. Slowly lift the red lever of the quartz flow cell clamp.
5. Grip the quartz flow cell with two fingers at the top and carefully remove from the holder.
6. Clean the quartz flow cell.
7. Place the quartz flow cell back in the holder (ensuring that there are no fingerprints on both sides
of the quartz flow cell where the light path comes through).
8. Lower the red lever of the quartz flow cell clamp very slowly to lock the quartz flow cell in place,
making sure the quartz flow cell is properly aligned as you lower the clamp.
9. Reconnect both inlet and outlet tubing then open the inlet valve to allow test water to flow through
the sensor and check for any leaks in the flow cell, piping and fittings.
10. Check for leaks. If a leak occurs, immediately shut off the water supply and drain the flow cell
and then reinstall it correctly.
11. Close the door of the sensor.
Two of the most important factors that affect the analyzer performance are the cleaning fluid used to
clean the flow cell, and how often the flow cell is cleaned (cleaning frequency). The optimum cleaning
fluid and cleaning frequency is dependent on the type of sample water being analyzed. For example,
for drinking water treatment applications it is recommended to start with a twice per week cleaning
schedule using a mineral deposit remover.
Sample water with low levels of organics could have high mineral content and therefore
fouling and scaling is not necessarily linked to UV absorbance or organics content.
3.1.5.2 Replacing UV Lamp
The lamp has a rated life of 12000 hours, however under normal use it should last much longer. When
the message “Lamp Too Low” is displayed on the screen, it is time to order a new lamp.
The sensor will work for some time with this warning on the screen, but it is recommended
to replace the lamp at this point as soon as possible to ensure the accuracy of the sensor.
It is recommended that the lamp is replaced every 18 months or so for preventative maintenance.
At the same time it is recommended that the blue ribbon cable is also replaced. Contact your supplier
for a replacement parts. To replace the lamp follow the steps below.
1. Unplug the sensor from the power supply.
2. Shut off the water flow.
3. Drain the flow cell by disconnecting the 1/4" tubing from the external push-in fittings on the side
of the sensor.
4. Remove the flow cell by pulling up on the blue handle of the toggle clamp above the flow cell.
5. Disconnect the blue ribbon cable form the rotating arm assembly.
6. Loosen the set screw that secures the rotating arm assembly to the motor shaft.
7. Lift up on the rotating arm assembly and remove the assembly.
8. Use a small, flat head screw driver to pry the lamp base from the ceramic lamp socket.
9. Press the new lamp securely into the ceramic lamp socket.
10. Replace the rotating arm assembly back onto the motor shaft and tighten the set screw on the
flat of the motor shaft.
11. Replace the blue ribbon cable.