Hanna’s innovative, high-specification 720 series conductivity controllers offer economical, constant monitoring of Electrical Conductivity (EC). HI720 is a PID, PI, proportional or on/off EC/TDS controller with one or two set points.
It is possible to connect the controller to a GSM cellular engine (HI 504900 or HI 504901). This connection enables the instrument to send SMS to one (or two) cellular phone(s) and through this feature the device can be monitored at any moment. Moreover, if an error occurs on the HI 720, it is possible to receive an alarm SMS which immediately advises about the problem.
The cleaning feature allows an automatic cleaning action of the probe. Simple cleaning, with water only, can be triggered only by a timer (periodical cleaning) or by an error for which a cleaning action can be configured. Advanced cleaning, with water and detergent, it can be triggered by a variety of events.
Temperrature is continuously monitored using a temperature sensor (Pt100 or Pt1000 type) with ATC of conductivity. Conductivity temperature compensation parameters are fully customizable: linear or non-linear temperature compensation, reference temperature and temperature coefficient. Users can define the specific curve of temperature compensation.
The hold function allows the user to stop the regulating action of the controller for programmable time periods. It is possible to activate the hold periods in correspondence to programmed operations, such as plant maintenance and cleaning procedures.
The controller logging feature can save the last 100 error, configuration, calibration and cleaning events. This information can be accessed from a PC through RS485 and HI92500 software.
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.
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