IPS Controllers M920 Owner's Manual page 27

M920 & M920W pH/Dual ORP Controller Owner's Manual
7. Hidden Features
a. The Up/Down buttons can be locked out to prevent
unauthorized changes to the settings. There is a hidden button
behind the "0" in IPS-M920 on the front overlay. Place the M920
into standby mode and then press and hold the hidden button
for 2 seconds, until the display indicates "Loc On" and the Up/
Down keys do not operate. All other feature buttons will work to
display current settings. Turn the lock off by holding the hidden
button down for 2 seconds until the display indicates "Loc Off".
b. The M920 can be forced to manually dose pH, ORP1, or ORP2
by placing the M920 into the standby mode that is desired (pH,
ORP1, ORP2), and then holding down the Dose Time button and
pressing the Delay Time button. The M920 will dose for the time
set in the dose time setting (timed-feed only).
8. Factory defaults
To return the controller to the factory defaults:
a. Place the controller in Standby Mode.
b. Turn off the controller by holding down the Mode button.
c. Press and hold both the Set Level and pH Cal pushbuttons, and
then press the Mode button.
d. The pH display will show "Ld" and the software version number
will display in the ORP window.
e. The controller will be returned to the factory default functions
and be placed in the test mode.
f. Return the controller to full operation by again turning off the
controller with the Mode button. Then turn the controller on
again by pressing the Mode button. Note: Failure to complete
this action will leave the controller in the test mode.
Figure 6: Hidden button
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