Eagle Microsystems RA1000 - Manual (Page 8)

8
E. The analyzer requires a minimum stabilization time of 24 hours. During
this time, reagents must be feeding into the cell . Under normal
circumstances, reagent level will drop approximately 1" per 24 hrs.
C. After stabilization, calibration may be required. Instruments are calibrated
at the factory; at start-up Auto Zero adjustment is necessary to
compensate for composition of the local water.
III. OPERATION
C. CLEANING
The frequency of cleaning the analyzer is greatly affected by the condition
of the water. By visually inspecting for dirt built-up, determine the need
for cleaning. The following points should be cleaned as indicated:
1. The inlet filter screen and overflow weir should be cleaned when a
dirt build-up is observed or when the screen has been plugged
sufficiently to stop flow.
Lift out the overflow weir and filter screen. Hold parts under a
water stream until clean and reinstall in the analyzer.
2. If the analyzer becomes clogged to the point where no water is
passing over the overflow weir, the analyzer must be flushed.
The overflow can be observed below the motor or by the
overflow tube directly behind the cell for flow into the drain block.
Flush as follows:
a. Turn the power switch to the OFF position.
b. Remove the flush plug in the flow tube with sample
flowing and allow to drain.
c. Install flush plug into flow tube.
d. Repeat step b (steps b and c can be repeated until
the unit is clean).
e. Turn the power switch to the ON position and resume
operation.
B. REAGENT VALVE
If the reagent feed has stopped and all air is removed from tubing, the
reagent valve (P/N 450044) must be cleaned. The feed rate of this
valve is very small, therefore, be certain the reagent has stopped before
cleaning is attempted. Check for feed by marking the reagent level on
the bottle and observing the change in level over eight (8) hours. If the
reagent level has not lowered during this test, the valve must be cleaned.
Proceed as follows:
1. Turn the power switch to the OFF position.