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HI 700 and HI 710 Conductivity Controllers

Commonly used in boiler, cooling tower and electroplating applications, conductivity is also used in brewery, food, paper/textile and detergent manufacturing processes.

The "Technical Info" area of this website discusses conductivity measurement in greater detail. (see blue underlined link below)

Technical Article: Conductivity Measurement

Process controllers shown below are used for all of the applications listed above.

Key Features:

  • Dual setpoint with On-Off and PID control output
  • Outputs:
    • Analog recorder output, 4-20mA, 0-5VDC, 0-10VDC
    • Relay Control outputs: two @ 5A SPDT
    • RS-485 output opto-isolated, bi-directional (if analog output is not specified)
    • Alarm relay, 5A SPDT
  • Manual or automatic temperature compensation (with Pt-100 RTD input)HI 700 or HI 710 Conductivity controller
  • Password protection
  • Conductivity input either: 4-20mA or 4-Ring probe
  • Calibration: automatic or manual single point
  • Adjustable temperature coefficient
  • Range: 0.0 to 200,000 μS/cm
  • Dual scale version has both μS/cm units and TDS units ppm
  • Temperature range of input: -10C to 100C
  • Accuracy: 0.5%
  • Panel cutout: 5.5" x 5.5" (140mm x140mm)
  • Dimensions: 1/2 DIN (144mm x144mm) x 6.7" (170mm)
  • Optional: Wall mounted enclosure (HI 23)
  • Weight: 3.5 lbs (1.6kg)
  • Power: 115VAC or 230VAC

Probe, HI 7639:

    The recommended sensor (HI 7639) for this controller uses a four ringHanna Process Conductivity Probe: HI 7639 potentiometric method of measuring conductivity.  The rings are made of platinum and provides a more stable measurement over a wide range.  Unlike conventional sensors, this probe does not need frequent calibration.  And because of its design, polarization is not an issue.  The internal RTD provides the controller with automatic temperature compensation.

  • Sensor: 4-Ring Platinum
  • Body: Ultem high temperature plastic and glass
  • Connection: 3/8" NPT Stainless Steel threaded
  • Cable: 4 meters
  • Temperature compensation: Pt100
  • Length: 60mm (not including threads)
  • Diameter of sensor: 12 mm
  • Maximum temperature: 120C (248F)
  • Maximum pressure: 5 bar (73 psi)


Transmitter, HI 8936:

    Using a similar sensor (HI 7638) the Hanna Conductivity Transmitter series allows a temperature compensated analog signal to be input to the controller.  The transmitters require 24vdc external power to energize the loop current.

  • Output: 4-20mA (maximum 500Ω)
  • Enclosure: IP65 Waterproof
  • Local display: Optional
  • Temperature compensation: 0-50C
  • Calibration: 2 point
  • Ranges (selectable):
    • 0.0-199.9mS/cm
    • 0.00-19.99mS/cm
    • 0-1999  ųS/cm
    • 0.0-199.9 ųS/cm






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MBH Engineering Systems 2008
Last modified: 29-Oct-2008