M920 & M920W pH/Dual ORP Controller Owner’s Manual
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2. The Over Timer is interlocked with the Dose Time selecon.
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 me will reset its count. If the preset cycle
is reached, the pH digital display will ash, and the pH
output relay will de-energize. The controller must be reset
manually by cycling out of and back into the Auto mode
using the mode buon.
- Selectable range: 20 to 100 cycles
ii. If the Dose Time is set to a connuous feed mode, the
Over Timer will count in minutes. Default is 60 minutes.
- Selectable range: 20 to 180 minutes
3. When the Dose Time is changed from either med or con-
nuous 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: 8.0 pH
2. Selectable range: OFF, 7.5 pH to 8.4 pH (acid feed). A high
alert will occur if the pH level remains above the High Alert
level for 10 connuous minutes, and will automacally turn
o the High Alert when the pH level falls below the high alert
level for 1 connuous minute. During High Alert, the pH dose
output will be disabled, and by default ORP1 and ORP2 will
be disabled (see Dip Switch #2 sengs).
f. Low Alert
1. Default: 7.0 pH
2. Selectable range: OFF, 6.8 pH to 7.4 pH (acid feed). A low
alert will occur if the pH level remains below the Low Alert
level for 10 connuous minutes, and will automacally turn
o the Low Alert when the pH level rises above the low alert
level for 1 connuous minute. During Low Alert, the pH dose
output will be disabled.
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