Specifications - Hanna Instruments HI 720 Instruction Manual

The main features of the HI 720 controller series include:
• Measurement and control of conductivity or concentration
• Concentration can be measured as usual TDS (fixed ratio) or through custom
conductivity/temperature/concentration curves
• Customizing temperature coefficient table and NaCl temperature compensa-
tion according to IEC 746-3, in addition to the standard linear compensation
• Auto-ranging
• Display reading offset adjustment for temperature
• Temperature level alarm
• Cleaning in place activated through two cleaning commands, or triggered by
a variety of events
• Hold management, including a digital input to enter the hold mode through
an external trigger
• Conductivity probe check
• Digital transmitter input
• Pt100 or Pt1000 temperature sensor with automatic recognition and dam-
age test
• Calibration time-out
• Logging of the last 100 error, configuration and cleaning events
• Alarm fault current (3.6 mA or 22 mA)
• SMS messages sending
• Alarm configuration can be customized: different errors can lead different
actions (alarm relay activation, fault current, hold mode, automatic cleaning,
SMS message)
• RS485 communication with additional capabilities, such as error log file down-
loading and cleaning commands
• Daily programmable control timing
• Diagnostic features
• Password protection
8

SPECIFICATIONS

Range
Resolution
Accuracy ±2% f.s. (conductivity) / ±0.5°C / ±1°F
Typical EMC Deviation ±2% f.s. (conductivity) / ±0.5°C / ±1°F
Temp. Compensation
Temperature Probe 3-wire or 2-wire Pt100 or Pt1000 sensor
with automatic recognition and damage test
Digital Input Digital Transmitter, Hold & Advanced Cleaning inputs
Digital Output 1 digital insulated contact closed upon Hold mode
Analog Output
0-22 mA (configuring as 0-20 mA or 4-20 mA)
Digital Serial Output
Dosing Relay 1, 2, 3 or 4 electromechanical relays SPDT;
5A-250 Vac, 5A-30 Vdc (resistive load);
Alarm Relay
5A-250 Vac, 5A-30 Vdc (resistive load);
Installation Category
Power Supply
115 Vac or 230 Vac or 100 Vac ±10%, 50/60 Hz;
fuse protected: 400 mA, 250 V fast fuse
Power Consumption
Max Oscillation Frequency
Environment 0 to 50°C (32 to 122°F); RH max 85% non-condensing
Enclosure
Weight
0 to 2000 mS/cm (auto-ranging)
-30 to 130°C / -22 to 266°F
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)
0.1°C / 0.2°F
Automatic or manual, -30 to 130°C
1 or 2 independent outputs;
RS485
fuse protected: 5A, 250 V fuse
1 electromechanical relay SPDT;
fuse protected: 5A, 250 V fuse
II
24 Vdc/ac, or
10 VA
8 MHz
Single case 1/2 DIN
Approx. 1.6 kg (3.5 lb.)
9