HI 9912: pH and ORP Proportional Control, Wall Mount

• Two separate setpoints can be user-adjusted
• Two independent terminals provide for pH and ORP ground probes
• Accepts any pH and/or ORP electrode ending in a universal BNC connector

HI 9912 is a 2-in-1 pH and ORP controller specially designed for pool control. Two separate setpoints can be user-adjusted from 6 to 8 pH and 500 to 900 mV. The relays are activated when the pH exceeds or the mV falls below the relevant setpoint. HI 9912 accepts any pH and ORP electrode ending in a universal BNC connector. Two independent terminals provide for pH and ORP ground probes to eliminate interference and prolong the electrodes' lives. HANNA instruments® proportional control allows considerable savings by minimizing the use of chemicals. The settings are made through independent time cycles adjustable from 0 to 90 seconds and two proportional bands from 0 to 200 mV and 0 to 2 pH. Two pumps or electro-valves can be wired directly to the controller and be powered through the terminal. HI 9912's alarm is activated when measurements exceed the operator adjustable thresholds of 50 to 250 mV or 0.5 to 2.5 pH. Should the two max. dosing periods of 1 to 10 minutes be exceeded an alarm is activated to signal the abnormality. The alarm is alterable in a normally-closed or a normally-open state and can be turned off during maintenance. The pools status can be ascertained from a distance through dosage and alarm LED's. HI 9912 comes with extractable terminal modules for quicker and safer wiring. The wiring compartment is protected behind a fire-retardant ABS removable panel.

HI 9912 is supplied complete with instructions.