M920 & M920W pH/Dual ORP Controller Owner’s Manual
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i. If the Dose Time is set to a med cycle, the Over Timer
will count med feed cycles. Every me the set level is
reached the Over Timer will reset the count. If the set
(default is 60 cycles) Over Timer cycle is reached, the ORP
digital display will ash, and the ORP output relay will de-
energize.
3. Selectable range in med feed: OFF, 20 – 100 feed cycles.
Selectable range in connuous feed: OFF, 20 – 180 minutes.
When the Dose Time is changed from either med or
connuous feed, the Over Timer is reset to Default.
4. Turning o the Over Timer will void any NSF Cercaon and
is not recommended for safety reasons.
e. High Alert
1. Default: 900 mV
2. Selectable range: 650 mV to 900 mV, no OFF. A high alert will
occur if the ORP level remains above the High Alert level for
10 connuous minutes, and will automacally turn o the
High Alert when the ORP level falls below the high alert level
for 1 connuous minute. During High Alert, the ORP1 dose
output will be disabled.
f. Low Alert
1. Default: 100 mV
2. Selectable range: OFF, 100 mV to 640 mV. A low alert will
occur if the ORP level remains below the Low Alert level for
10 connuous minutes, and will automacally turn o the
Low Alert when the ORP level rises above the low alert level
for 1 connuous minute. During Low Alert, the ORP1 dose
output will be disabled.
g. pH Cal disabled
4. ORP2 standby
Note: While inthismode,theyellowORP2standbyLEDwillilluminate,
boththepHandORPdigitaldisplayswillshowdashes,andallAuto
funconswillbedisabled.UsetheUporDownarrowbuonstothe
letoincreaseordecreasethefunconvalue.
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