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SKU HI9920-1 Category

Proportional Dosage ORP Controller - HI9920-1

All prices are VAT excluded and without shipping costs, unless otherwise stated.

HI9920 is an ORP controller with a single set point for user selectable dosage of reducing or oxidizing solutions. A pump or electrovalve can be wired directly to the controller and be powered through the terminals.

  • Fail Safe Alarm System protects against problems caused by power supply failure or signal interruption.
  • User selectable isolated output signal between 0-20 or 4-20 mA.
  • Designed for numerous industrial applications, but in particular for swimming pools and drinking water sanitation.

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Triple Contact Alarm System

When activated, the alarm contacts will open or close, triggering the mechanism of your choice, whether a buzzer, light or any other electrical device.The alarm is activated when the measurements exceed the operator adjustable threshold of 50 to 250 mV from set point.

BNC Connector

The electrodes can be installed quickly and easily. Simply plug the universal BNC connector into the socket and twist it into a secured position.

Proportional Control

With proportional control, you can fine-tune your treatment plant and minimize the use of chemicals. The proportional setting can be adjusted through the time cycle from 0 to 90 seconds and the band from 0 to 200 mV. The setpoint can be accurately adjusted through coarse and fine trimmers.


Fail Safe Alarm System

Hanna’s exclusive Fail Safe Alarm System protects against problems caused by power supply failure or signal interruption, which are typical risks in industrial environments. An alarm condition is indicated by a red LED, located directly on the front panel of the controller.

Visual Status Indicators

See the controller’s status, even from a distance, by observing the dosage or alarm LED’s.

Durable Construction

This controller is housed in a rugged, modular, fiber-reinforced ABS housing.

Additional Informations

Additional information




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