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HI-4101 Ammonia Combination ISE Electrode

HI-4101 Ammonia Combination ISE Electrode

Hanna HI-4101 Ammonia Combination ISE Electrode

HI-4101 Ammonia Combination ISE Electrode

1m cable with BNC connector
6 months manufacturers warranty
£682.60 (exc. VAT) £819.12 (inc. VAT)

The HI-4101 is an Ammonia combination Ion Selective Electrode ideal for the detection of ammonium and checking for Ammonia in wine, beer, water, waste water and soil/agriculture.

The HI-4101 is a gas sensing, combination ion selective electrode (ISE) for the determination of ammonia (NH3) in solution. Its PTFE membrane allows for ammonia gas diffusion into a thin layer of internal electrolyte. The internal sensing elements are within a durable Delrin® body.

  • Replaceable PTFE membranes
  • Durable Delrin® body
  • Detection from 0.02 to 17,000 mg/L NH3
  • HI-4101 Ammonia Combination ISE Electrode information

    Hanna's extended description

    The HI-4101 ammonia ion selective electrode is a complete potentiometric cell that contains both a silver/silver chloride (Ag/AgCl) reference and a pH measurement element. These elements are housed within a plastic body with a chloride ion-containing electrolyte, and are isolated from the sample by a gas permeable membrane made of polytetrafluoroethylene (PTFE).

    Ammonia can exist in two different forms: ammonia as a gas (NH3) and ammonium as the ionised form (NH4+). The concentration of each form in a solution is dependent on the solution’s pH. The pKa is the pH value at which ammonia and ammonium are in equilibrium. The pKa of the ammonia/ammonium relationship is 9.24; thus, at a pH of 9.24 there will be an equal concentration of ammonia and ammonium. As pH decreases, becoming more acidic, the concentration of ammonium increases and ammonia decreases. The opposite occurs as the pH increases. The actual concentration for either species can be determined by knowing the concentration of ammonia and the pH of the sample.

    For the HI-4101 to measure ammonia accurately, it is important that the pH of the calibration standards and sample be raised with the ammonia ionic strength adjuster (ISA) solution. The ammonia ISA raises the pH of the solution to pH 11. Any ammonium present in the calibration standards and sample will be converted to ammonia, ensuring an accurate measurement. The HI-4101 ammonia gas sensing ISE can measure from 1µM (0.02 mg/L) to 1M (17,000 mg/L).

    BNC Connection – BNC is one of the most commonly used connector types in pH meters and electrodes. Compatible with any meter or electrode that uses BNC connectors.


    Specifications list


    Parameter Ammonia
    Type Gas-Sensing; Combination
    Measurement Range 1M to 1X 10-6M 17000 to 0.02 ppm
    Optimum pH Range >11
    Temperature Range 0 to 40°C
    Approximate Slope -56
    Body O.D. 12 mm
    Insertion Length 120 mm
    Body Material Delrin
    Cable 1m coaxial
    Connector BNC
    Possible Applications Determination of ammonium, ammonia in wine, beer, water, waste water and soil

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