Myron L 762 - Manual (Page 10)

Operating Procedures
“3 RANGE” Full Scale Select Switch
A full scale range of 0-20 megohms is selected when
the switch is placed to its RANGE “X 1” position.
A full scale range of 0-2 megohms is selected when the
switch is placed to its RANGE “X .1” position.
A full scale range of 0-0.2 megohms is selected when
the switch is placed to its RANGE “X.01” position.
“3 CELL INPUT” Select Switch (Optional)
Cell 1’s inputs are monitored when switch is placed to
its CELL “1” position.
Cell 2’s inputs are monitored when switch is placed to
its CELL “2” position.
Cell 3’s inputs are monitored when switch is placed to
its CELL “3” position.
3.3 OPERATIONAL CHECKOUT PROCEDURES
The following check-out procedures are used to verify that a
Monitor is operating properly.
3.3.1 MODEL 750
STEP 1 Turn the “SET POINT” adjustment knob to 20 megohm.
The red “BELOW” light should be on indicating that the
water being monitored is below the Set Point.
STEP 2 Turn the “SET POINT” adjustment knob to 0 megohm.
The green “ABOVE” light should be on indicating that
the water being monitored is above the Set Point.
STEP 3 Rotate the Set Point adjustment knob back and forth
and note the reading at which the lights change. Also
note an audible click as the relay picks up and drops
out. This reading corresponds to the actual water purity.
STEP 4 Set the adjustment knob to the desired control point
setting. Check-out is now complete.
3.3.2 MODELS 752, 753, AND 762
STEP 1 On Model 762, set range switch and cell selector
switch (if applicable) to the desired settings.
STEP 2 Observe resistance reading of water being monitored.
STEP 3 With front panel removed, depress “CHECK SET
POINT” switch and observe “SET POINT” on panel
readout. With a small screwdriver, rotate the Set Point
adjustment pot (R31, Fig. 4-1) to above the reading
observed in Step 2. Release “CHECK SET POINT”
switch and observe that the red (below) light is on.
Depress “CHECK SET POINT” switch and adjust Set
Point to below the reading observed in Step 2. Release
“CHECK SET POINT” switch and observe that the
green (above) light is on. Also note the audible click of
the relay as the lights change.
STEP 4 Adjust Set Point to desired setting and replace front
panel. This completes the checkout.
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