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6.4 Adjust the low needle valve
Switch the range control left that is II 20-50 um, percentage of voids pointer should be at 0.75, now the manometer level comes down, then it becomes still, adjust the rack and pinion control to make the manometer level pointer coincides the water level, now the value the size pointer shows should be the Low Value marked on the fisher calibrator tube, if not please adjust the low needle valve.
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