M920 & M920W pH/Dual ORP Controller Owner's Manual
Figure 2: M920 Controller Components Connecti ons
E. Controller Panel Descripti ons
1. Digital Displays and Functi on LEDs
a. pH
1. Alert (High/Low) - red LED
2. Dose - green LED
3. Flashing Leds - Over Timer Alert
b. ORP
1. Alert (High/Low) - red LED
2. Dose 1 - yellow LED
3. Dose 2 - yellow LED
4. Flashing LEDs - Over Timer Alert
AC
ORP1
pH
Power
ORP2
Electrical
Connec�ons
Accessory
Flow
Switch
Temp
Sensor
8
ORP
Flow Cell
Connec�ons
pH
Controller Communication
digital display
pushbutton
LEDs
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