IPS Controllers M920 - Page 22

M920 & M920W pH/Dual ORP Controller Owner’s Manual
20
2. The Over Timer is interlocked with the Dose Time selecon.
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 buon.
- Selectable range: 20 to 100 cycles
ii. If the Dose Time is set to a connuous 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 Cercaon 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 connuous minutes, and will automacally turn
o the High Alert when the pH level falls below the high alert
level for 1 connuous minute. During High Alert, the pH dose
output will be disabled, and by default ORP1 and ORP2 will
be disabled (see Dip Switch #2 sengs).
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 connuous minutes, and will automacally turn
o the Low Alert when the pH level rises above the low alert
level for 1 connuous minute. During Low Alert, the pH dose
output will be disabled.