Hanna Instruments

Scientific Equipment

HI-720122-2 Conductivity Process Digital Controller

HI-720122-2 Conductivity Process Digital Controller

HI-720122-2 Conductivity Process Digital Controller

HI-720122-2 Conductivity Process Digital Controller

£1,339.50 (exc. VAT) £1,607.40 (inc. VAT)

Make process monitoring easy and affordable with a high-spec controller from our digital control series.

Extremely accurate and simple to install, Hanna’s innovative high-specification 700 series controllers offer economical, constant monitoring of pH, Oxidation Reduction Potential (ORP), and Electrical Conductivity (EC).

Using the new Tele-control™ technology, it enables users to control the unit from any distance at all times allowing optimisation of operations such as maintenance cycles.

Mains powered - All mains operated equipment is compatible with UK AC voltage and frequency – 230V, 50Hz.
Water Resistant – Can withstand temporary exposure to water, but should not be submerged or washed under running water.

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HI-720122-2 Conductivity Process Digital Controller information

Hanna's extended description

HI-720122-2 Conductivity Process Digital Controller

Two-way communication supplied by the RS485 output and Windows® compatible software means users can control the complete regulation process from their PC or through SMS via mobile phone.

  • Sensor Check™ - fault finder
  • CAL Check™ – Alerts users of calibration status
  • ATC – Automatic temperature compensation
  • Logging – Logging of up to 100 system events

The HI-720122-2 is a PID, PI, proportional or on/off EC/TDS controller with one or two set points and includes an inductive conductivity probe.

The measurement configuration settings and EC and TDS control are saved separately and allow users to switch between EC and TDS without losing settings.

Temperature is continuously monitored using a temperature sensor (pt100 or Pt1000 type) with ATC of conductivity.

One or two analogue controller outputs (0-20 or 4-20mA) can be configured for recording or controlling (only for models with PID), and up to 4 relays can be used to control the process or be connected with alarm status. Controller status is visible with LEDs on the front panel and on LCD.

In general, the compact, easy-to-use controllers are designed to consistently perform in most environments and conditions twenty-four/seven.

There is no need to worry about space or cost, as all the controllers can be installed in confined spaces and the low cost means previously manual monitoring can now be automated, saving time and money.

The controllers have large, easy-to-read displays, fire-retardant casing, proportional control, full PID Control, password protection, analogue or digital transmitter input, data logging, programmable cleaning cycles and fail safe alarm systems.


Specifications list


Specification HI-720
Range 0 to 2000mS/cm (autoranging); -30 to 130°C/-22 to 266°F
Resolution 1 μS/cm (0 to 1999 μS/cm; 0.01 mS/cm (2.00 to 19.00 mS/cm); 0.1 mS/cm (20.0 to 199.9 mS/cm); 1mS/cm (200 to 2000 mS/cm); 0.1° C/0.2° F
Accuracy (@25°C/77°F) +-2% f.s. (conductivity) / +-0.5°C/ +-1°F
Temperature Compensation automatic or manual, -30 to 130°C
Temperature Probe Three-wire to two-wire Pt100 or Pt1000 sensor with automatic recognition and damage test
Digital Input Digital transmitter, hold and advanced cleaning inputs
Digital Output One digital insulated contact closed upon hold mode
Analogue Output One or two independent outputs; 0-22 mA (configuring as 0-20 mA or 4-20mA
Digital Serial Output RS485
Dosing Relay 1, 2, 3, or 4 electromechanical relays SPDT; 5A-250 VAC, 5A-30 VDC (resistive load), fuse protected; 5A, 250 V fuse
Alarm Relay 1 electromechanical relay SPDT; 5A-250 VAC, 5A-30 VDC (resistive load), fuse protected; 5A, 250 V fuse
Installation Category II
Power Supply (depending on model) 24 VDC/ac, or 115VAC or 230VAC or 100VAC +-10%, 50/60 Hz; fuse protected; 400mA, 250V fast fuse
Power Consumption 10 VA
Max Oscillation Frequency 8MHz
Environment 0 to 50°C (32 to 122°F); RH max 85% non-condensing
Enclosure Single case 1/2DIN
Weight 1.6kg (3.5lb)
Probes (available separately) HI-7610 Stainless steel Pt100 probe with front and back 1/2"NPT thread and 5m (16.4') cable
HI-7611 Glass Pt100 probe with front and back 1/2" NPT thread and 5m (16.4') cable
HI-7620 Stainless steel Pt1000 probe with PG 13.5 thread and 5m (16.4') cable
HI-7621 Glass Pt 1000 probe with PG13.5

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Product Literature

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Hanna Instruments Literature

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