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AlpHa Measurement Solutions |
Ion-Selective Electrodes in Refining & Petrochemical

ISE in Refining & Petrochemical

Water is a critical component throughout all stages of the petrochemical and refining processes. Moreover, the quality of the water has a significant impact on the process efficiency and operational effectiveness. AlpHa’s ion-selective electrodes (ISEs) enable real-time measurements, which are essential in refining & petrochemical applications. Examples of some key ions and their significance are as follows:

  • Chloride ISE measurements are performed during the desalting of crude oil
  • Analysis in sour water stripping through ammonia, sulfide, cyanide, fluoride, and chloride ISEs
  • Silver ISE is utilized in silver nitrate titration for mercaptans and thiols in naphtha and gasoline
  • Chloride ISE is used to determine salts present in crude oil, diesel, kerosene, gasoline, and turbine oil

Ion-Selective Electrodes in Refining & Petrochemical
Ion-Selective ElectrodeRange @ 25°CTechnology TypeTemp. RangeWarranty
Ammonia (NH3)0.01 – 17,000 ppm as NH3Gas Sensing0 – 50°C12 Months
Ammonium (NH4+)0.1 – 14,000 ppm as NPVC Membrane0 – 40°C6 Months
Bromide (Br-)0.2 – 79,900 ppmSolid State Pellet0 – 80°C12 Months
Cadmium (Cd2+)0.01 – 11,200 ppmSolid State Pellet0 – 80°C12 Months
Calcium (Ca2+)0.5 – 40,100 ppmPVC Membrane0 – 40°C6 Months
Carbon Dioxide (CO2)4.4 – 440 ppmGas Sensing0 – 50°C12 Months
Chloride (Cl-)1.8 – 35,000 ppmSolid State Pellet0 – 80°C12 Months
Copper (Cu2+)0.064 – 6,400 ppmSolid State Pellet0 – 80°C12 Months
Cyanide (CN-)0.2 – 260 ppmSolid State Pellet0 – 80°C12 Months
Fluoride (F-)0.02 – 19,000 ppmSolid State Crystal0 – 80°C12 Months
Fluoroborate (BF4-)VariesPVC Membrane0 – 40°C6 Months
Iodide (I-)0.01 – 127,000 ppmSolid State Pellet0 – 80°C12 Months
Lead (Pb2+)0.2 – 20,700 ppmSolid State Pellet0 – 80°C12 Months
Lithium (Li+)0.2 – 10,000 ppmPVC Membrane0 – 40°C6 Months
Magnesium (Mg2+)0.1 – 30,000 ppmPVC Membrane0 – 40°C6 Months
Nitrate (NO3-)0.1 – 14,000 ppm as NPVC Membrane0 – 40°C6 Months
Nitrogen Oxide (NOx)VariesGas Sensing0 – 50°C12 Months
Perchlorate (ClO4-)VariesPVC Membrane0 – 40°C6 Months
Potassium (K+)0.04 – 39,000 ppmPVC Membrane0 – 40°C6 Months
Silver (Ag+)0.01 – 107,900 ppmSolid State Pellet0 – 80°C12 Months
Sulfide (S2-)0.01 – 32,100 ppmSolid State Pellet0 – 80°C12 Months
Sodium (Na+)0.01 – 100,000 ppmSensing Glass0 – 80°C12 Months
Surfactant (X+ / X-)VariesPVC Membrane0 – 40°C6 Months
Water Hardness (Ca2+ / Mg2+)0.5 – 40,000 ppmPVC Membrane0 – 40°C6 Months
  • Form Factor
    • 12 mm
    • Process Body
    • Cartridge
    • Custom Options Available
  • Housing Material Options
    • Glass
    • Ryton® (PPS)
    • ABS
    • Epoxy
    • Polycarbonate
    • Kynar® (PVDF)
    • Polyethylene
    • PEEK
    • PVC / CPVC
    • Teflon™ (PTFE)
    • Ultem® (PEI)
    • Custom Options Available
  • Thermistor Options
    • Not commonly integrated, however, optional per design requirements
  • Reference System
    • Ag / AgCl
    • Custom Options Available
  • Reference Junction Options
    • Single Junction
    • Double Junction
    • Custom Options Available
  • Reference Junction Material / Design
    • Ceramic Pin / Annular / Disc
    • Fiber / Pellon
    • Open Aperture 
    • Porous Plastic (PTFE / HDPE / PP)
    • Sleeve Junction / Free Flow (liquid / liquid or ground glass joint)
    • Solid State
    • Custom Options Available
  • Reference Electrolyte
    • Sealed
      • Soft Gel
      • Solid Gel
    • Refillable
      • Liquid
      • Soft Gel
    • Custom Options Available
  • Integrated Insertions
    • PG 13.5
    • 3/4" NPT
    • 1/2" NPT
    • 1" NPT
    • Custom Options Available
  • Analog
    • Millivolts
    • 0 – 5 V
    • 0 – 10 V
    • 4 – 20 mA
    • Custom Options Available
  • Digital
    • RS-485 MODBUS RTU
    • Custom Options Available 
  • Connectors
    • Integrated Connectors (detachable or cableless)
      • S7
      • S8
      • Integrated BNC
      • Variopin
      • Custom Options Available 
    • Connectors with Cables (including temperature)
      • BNC
      • DIN
      • MOLEX
      • Tinned Leads
      • Mil-spec
      • 2.5 mm / 3.5 mm phono
      • RCA
      • Spade Lugs
      • LEMO
      • Circular Connectors
      • Any commercially available connectors and custom options available