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.
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.
Continuous Temperature Monitoring
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.
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.
Logging Capabilities
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.
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.
| Specification Name | Detail |
|---|---|
| sku | HI720 Series |
| EC Range | 0 to 2000 mS/cm (auto-ranging) |
| EC Resolution | 1 ?S/cm (0 to 1999 ?S/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 (@20°C/68°F) | ±2% f.s. |
| Temperature Range | $-30 to 130°C / -22 to 266°F |
| Temperature Resolution | 0.1°C / 0.2°F |
| Temperature Accuracy (@20°C/68°F) | ±0.5°C / ±1°F |
| Typical EMC Deviation | ±2% f.s. (conductivity) / ±0.5°C / ±1°F |
| Digital Inputs | Digital Transmitter, Hold & Advanced Cleaning inputs |
| Digital Output | 1 digital insulated contact closed upon Hold mode |
| Temperature Compensation | Automatic or manual, -30 to 130°C |
| Analog Input | 1 or 2 independent outputs; 0-22 mA (configuring as 0-20 mA or 4-20 mA) |
| Probe | Temperature Probe: 3-wire or 2-wire Pt100 or Pt1000 sensor with automatic recognition and damage test |
| Dosing Terminals | 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 |
| Power Consumption | 10 VA |
| Max. Oscillation Frequency | 8 MHz |
| Alarm Relay | 1 electromechanical relay SPDT; 5A-250 Vac, 5A-30 Vdc (resistive load); fuse protected: 5A, 250 V fuse |
| Environment | 0 to 50°C (32 to 122°F); RH max 85% non-condensing |
| Enclosure/ Case Material | Single case 1/2 DIN |
| Weight | Approx. 1.6 kg (3.5 lb.) |
