The HI 8710 is a panel mounted pH Controller with self diagnostic and test. The user can set: the setpoint for acid or alkaline dosage, the tolerance of the setpoint before an Alarm is activated, the Dosage mode: Automatic, Continuous On or OFF and the Over dosage control by setting the Overtime dosage knob.

When used in conjunction with the HI 8720 ORP controller, the ODCD* function will ensure that the ORP dosage will start only when the pH level is correct.

The controller is also provided with a unique self-diagnostic test to check the pH electrode and instrument status.

“Over time dosage” function with selection knob and jumper for disable on the rear panel. If the dosing relay remains continuously activated for more than selected dosing time the alarm relay is activated, the alarm LED is blinking and the dosing relay is deactivated.

“Automatic/OFF/Manual” dosing selection switch and LED on the front panel.

In Automatic mode all the relays are controlled based on measure, set point and alarm values. In OFF mode the dosing and alarm relays are always deactivated. The dosing LED is OFF (as relay status) and the ALARM LED is in according with the instrument setpoint, input reading and ?ALARM.

In ON (Manual) mode the dosing relay is always ON, the alarm relay is still enabled. If an alarm occur the alarm relay is activated but the dosing relay is not deactivated. If the over dosage time expire during Manual mode, the alarm relay is activated.

The front panel is protected behind a transparent splash-proof cover.

* ORP Dosing Consent Device

• BNC, amplified input and input from transmitter in one instrument
• Broader pH range
• Extended temperature compensation range: -0 to 100°C
• Supports potential matching pin connection
• Both 4-20 and 0-20 mA output user selectable, in one instrument
• ±5V outputs for amplified electrodes

Order Information:
The HI 8710 series is supplied with mounting brackets and instructions.