IPS Controllers M920 - Page 21

M920 & M920W pH/Dual ORP Controller Owner’s Manual
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d. The red funcon LED next to Auto is illuminated.
e. pH and ORP digital displays monitor the sensor input levels.
2. pH standby
Note:Whileinthismode,thegreenpHstandbyLEDwillilluminate,
boththepHandORPdigitaldisplayswillshowdashes,andallAuto
funconswillbedisabled.Whenafunconpushbuonispressed,
thecorrespondingdigitaldisplaywillshowthefuncon.UsetheUp
orDownarrowbuonstotheletoincreaseordecreasethefuncon
value.
a. Set Level
1. Default: 7.4 pH
2. Selectable range: 7.0 – 8.0 pH (in 0.1 increments)
b. Dose Time
1. Default: Timed dose of 10-second pH feed relay energized
and 5 minutes pH feed relay de-energized. In the med
dose cycle mode, the dose LED will ash while dosing and
illuminate steadily during the delay poron of the med
cycle. In connuous dose mode, the dose LED will ash while
dosing, and dosing will connue unl pH is 0.2 below (or
above if feeding base) Set Level.
2. Selectable range: OFF, CON (connuous), and Timed
(10 – 900 seconds ON)
c. Delay Time
1. Default: Delay me of 5 minutes between feed cycles (med
feed only). Aer dose me, the controller will wait (delay) for
the specied minutes before checking the current level and
dosing again if necessary.
2. Selectable range: 1 - 99 minutes.
d. Over Timer
1. Default: ON. The over mer does not automacally reset. It
must be reset by pressing the Mode buon to cycle through
the Standby mode and back to the Auto mode.