HI720 Series | Conductivity Process Digital Controller

HI720 Series | Conductivity Process Digital Controller
R 24,394.00 *

Prices excluded VAT and delivery costs

Delivery time approx. 2 to 4 weeks

  • HI720224-2
  Extremely accurate and simple to install, Hanna’s innovative high-specification 720... more
Product information "HI720 Series | Conductivity Process Digital Controller"

 Extremely accurate and simple to install, 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 and includes an inductive conductivity probe.

  • RS485 communication with additional capabilities, such as error log file downloading and cleaning commands.
  • Alarm configuration can be customized: different errors can lead different actions.
  • Mount probes directly or use a digital transmitter for large distances.







Short Messaging Service (SMS)

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.

Programmable Hold System

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.

In-Line Cleaning

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.

Logging Capabilites

The controller logging feature can save the last 100 error, configuration, calibration and cleaning events. This information can be accessible from a PC through RS485 and HI92500 software.

Continuous Temperature Monitoring

Temperature 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.

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



EC Range 0 to 2000 mS/cm (auto-ranging
EC Resolution 1 µS/cm (0 to 1999 µS/cm); 0.01 mS/cm (2.00 to 19.99 mS/cm); 0.1 mS/cm (20.0 to 199.9 mS/cm); 1 mS/cm (200 to 2000 mS/cm)
EC Accuracy ±2% f.s.
EC/TDS Temperature Compensation automatic or manual, -30 to 130°C

Meter Temperature

Temperature Range -30 to 130°C / -22 to 266°F
Temperature Resolution 0.1°C / 0.2°F
Temperature Accuracy ±0.5°C / ±1°F

General Meter

Temperature Probe three-wire or two-wire Pt100 or Pt1000 sensor with automatic recognition and damage test

Process Control Meter

Analog Ouput Signal one or two independent outputs; 0-22 mA (configuring as 0-20 mA or 4-20 mA)
Digital Input Signal digital transmitter, hold and advanced cleaning inputs
Digital Output Signal one digital insulated contact closed upon hold mode
Power Consumption 10 VA
Max. Oscillation Frequency 8 MHz
Enclosure single case 1/2 DIN
Installation Category II
Alarm Relay 1 electromechanical relay SPDT; 5A-250 VAC, 5A-30 VDC (resistive load); fuse protected: 5A, 250 V fuse
Dosing Relay 1, 2, 3 or 4 electromechanical relays SPDT; 5A-250 VAC, 5A-30 VDC (resistive load); fuse protected: 5A, 250 V fuse
Power Supply 24 VDC/ac, or 115 VAC or 230 VAC or 100 VAC ±10%, 50/60 Hz; fuse protected: 400 mA, 250 V fast fuse
Environment 0 to 50°C (32 to 122°F); RH max 85% non-condensing
Weight approximately 1.6 kg (3.5 lb.)
Ordering Information Each HI720 model is supplied complete with mounting brackets and instructions.


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