15
NOTE: Optimum recovery will vary according to water quality.
3.5. Autoflush Timer
3.5.1. Programming the Autoflush Timer
The Autoflush timer clock operates and displays in real time, but the Autoflush feature
will only work when the RO machine is operating. When the machine is operating in
the Autoflush Mode, the total flow through the machine is increased. This provides
extra cross flow, which flushes the loose foulants from the surface of the membrane
elements. When the machine is operating in the Autoflush Mode a slight drop in
permeate production, as well as a decrease in the primary and final pressures may
be observed. An ideal way to set the timer is to program ten Autoflush sequences,
with a 10 to 15 minute duration, per 24 hours. To do this, follow the procedure in the
Technote 126 containing the programming manual for the Autoflush Timer.
3.6. Calibrating the Conductivity Probe
1. Make sure the calibration meter is in Measure Mode (with the MEAS LED light
ON).
2. Immerse the Conductivity Probe in a HI 7033 prepared calibration solution
(84.00 microSiemens (mS)).
3. Immerse and agitate Conductivity Probe, and wait for the reading to stabilize.
4. Calibrate the meter by adjusting the CAL adjustment screw until the Liquid
Crystal Display (LCD) display reads 84 mS of the solution.
The meter is now calibrated.
NOTE: The alarm and dosing pump selector switch function on the conductivity meter
is not used on E4/EZ4/E4LE Series machines and should be switched to OFF.
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