General Description

Model HD 8706 is a precise instrument for measuring the electric conductivity of liquids and their temperature.

In conductivity measurements, the compensation of the temperature coefficient a Tis automatic with a Tvariable between 0.00%/°C and 4%/°C. The instrument is supplied complete with a conductimetry cell with 4 graphite electrodes (to eliminate polarization effects) and a built-in temperature sensor.

The possible range of measurement of this cell is extremely wide, from a few microsiemens (distilled water) to a fraction of Siemens (base or strong acid).

The instrument is provided with the following functions: "Autorange", "Hold", manual and/or automatic calibration with a sample solution (generally solutions of KCI with a known concentration) relative measurements, simultaneous storage (RCD) of minimum and maximum for both conductivity and temperature, Auto-Power-Off (it may be disabled), "Beep" to indicate that a key has been activated. The TP 870 range of probes is available for temperature measurements in a wider range than possible with the conductimetry cell.

Instrument Control Legenda
  1. Input A DIN 8-pole connector. This input is suitable for the combined conductivity / temperature probe and for the TP 870 series of solely temperature probes.
  2. HOLD symbol indicating HOLD status.
  3. Display.
  4. MIN symbol. The value indicated on the display is the MIN value stored by the instrument.
  5. MAX symbol. The value indicated on the display is the MAX value stored by the instrument.
  6. RCD symbol. Indicates that the instrument is storing the maximum and minimum value of the probe inserted in input A.
  7. HOLD key. When this key is pressed the reading on the display is held while internally the instrument continues to update data.
  8. REC key. when this key is pressed the instrument is set to store che MAX, MIN and present values read at the probe input.
  9. REL key. For selecting REL relative operating mode. The relative measurement is taken with respect to the moment the REL key is pressed.
  10. "aT" Key.When this key is pressed the modification of the temperature coefficient by means of the "triangle up-down" keys is enabled.
  11. °C/°F Key. When this key is pressed temperature reading in °C or °F is selected.
  12. "Triangle Up" key. This key is used during calibration to increase the value indicated on the display .
  13. °C symbol, indicates that the reading being made is in °C.
  14. °F symbol, indicates that the reading being made is in °F.
  15. µS symbol, indicates that the reading being made is in µS (microSiemens).
  16. mS symbol, indicates that the reading being made is in mS (milliSiemens).
  17. REL symbol, indicates that a REL relative measurement is being taken.
  18. B, flashing symbol, indicates that AUTO-POWER-OFF is disabled.
  19. ON/OFF key ot switching the instrument on and off.
  20. DATA-CALL key; when this key is pressed the display shows in sequence the MAX, MIN and present value of the signal detected by the probe inserted in input A.
  21. X Keywhen this key is pressed the electric conductivity of the liquid being tested is measured .
  22. CAL key when this key is pressed during the conductivity measurement, automatic and/or manual calibration is enabled.
  23. Key V this key is used during calibration to decrease the value indicated on the display.
Technical Specifications
  • Conductivity: 0...199.9 µS; 1999 µS/1 µS; 19.99 mS/0.01 mS; 199.9 mS/0.1 mS
  • Temperature:
    • -25...+60°C (-19...+140°F) with built-in sensor in the conductimetry cell HD 8706S;
    • -50... + 199.9°C (-58...392°F) with optional TP 870 resolution 0.1 °C or 0.1°F up to + 199.9°F,1 °F beyond 200°P
  • Precision:
    • ±0.5% end of scale ±0.5% of reading for conductivity;
    • ±0.2°C (±0.4°F) ±0.15% of reading for temperature (including probe error)
  • Temperature Compensation: automatic with a T= 0.00. . .4.00%/°C
  • Display: LCD 12 mm
  • Symbols on the display: HOLD, RCD, REL, MAX, MIN, °C, °F, µS, mS
  • A/D Conversion Frequency: about 1 sec./conversion
  • Functions: Autorange, HOLD, storage of RCD, MAX/MIN, relative measure ments, automatic and/or manual calibration
  • Instrument Working Temperature: 0. . . + 50°C (32.. . + 122°F)
  • HD 8706S Probe Working Temperature: -25°C... + 60°C
  • Power Supply: 9W006P dry battery, duration about 100 hours with alkaline battery. Low battery charge indicated by a "Beep" at intervals of 30 seconds
  • Weight: about 350 gr
  • Dimensions: 135x73x38mm
  • Probe Connection: DIN 8-pole connector

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