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AlpHa Measurement Solutions |
pH in Ballast Water Treatment

pH in Ballast Water Treatment

The expansion of global seaborne transportation has created a massive undertaking in formulating ballast water management protocols that include pH and a host of other water quality measurements. Ballast water is the most common way for ships to adjust the way the vessel floats and is balanced in transit, especially when cargo has been emptied. The proper treatment of ballast water is critical to safeguard local environments. The purpose of this treatment is to mitigate the introduction of non-native organisms including fish, plant life, and microscopic organisms. The monitoring of pH ensures ballast water treatment processes are both efficient and effective.  Ballast water applications measure pH in process and in the lab using grab-sample methods. Typical ballast water ranges from 6 to 9 pH. Cold samples and high levels of salinity can compound the difficulty in measuring pH. These challenges can be mitigated with the optimal sensor design, in particular the reference junction design, housing material, and sensing chemistry.

oil tanker discharging water ballast
  • pH Range: 0 to 14 pH
  • Response Time: 10s 
  • Drift: ±0.05 pH (in 24 hours) 
  • Accuracy: ±0.02 pH 
  • Temperature Range: -5 to 135°C  
  • Warranty: 12 Months 
  • Form Factor
    • Process Body
    • 12 mm
    • Cartridge
    • Custom Options Available
  • Housing Material Options
    • Ryton® (PPS)
    • ABS
    • Epoxy
    • Polycarbonate
    • Kynar® (PVDF)
    • Polyethylene
    • PEEK
    • PVC / CPVC
    • Teflon ™ (PTFE)
    • Ultem® (PEI)
    • Glass
    • Metal
      • Stainless Steel
      • Other Metals Available
  • Thermistor Options
    • PT100 (type A & B)
    • PT1000
    • 10 kohm
    • 30 kohm
    • 100 kohm
    • Any commercially available thermistors and custom options
    • Common temperature accuracy is ±0.3°C and can vary based on thermistor option chosen
  • Reference System
    • Ag / AgCl
    • Differential
    • Custom Options Available
  • Reference Junction Options
    • Double Junction
    • Single Junction
    • Custom Options Available
  • Reference Junction Material / Design
    • Porous Plastic (PTFE / HDPE / PP)
    • Ceramic Pin / Annular / Disc
    • Fiber / Pellon
    • Sleeve Junction / Free Flow (liquid / liquid or ground glass joint)
    • Open Aperture 
    • Solid State
    • Custom Options Available
  • Solution Ground
    • Integrated in Thermowell
    • Integrated in Body Housing
    • Stand-alone
    • Custom Options Available
  • Reference Electrolyte
    • Sealed
      • Soft Gel
      • Solid Gel
    • Refillable
      • Liquid
      • Soft Gel
    • Custom Options Available
  • Glass Sensor Shape
    • Bulb
    • Dome
    • Flat
    • Semi Micro
  • Integrated Insertions
    • 3/4" NPT
    • 1/2" NPT
    • 1" NPT
    • PG 13.5
    • Custom Options Available
  • Analog
    • Millivolts
    • 4 – 20 mA
    • 0 – 5 V
    • 0 – 10 V
    • Custom Options Available
    • Custom options available with preamp capabilities
  • 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)
      • Tinned Leads
      • BNC
      • DIN
      • MOLEX
      • Mil-spec
      • 2.5 mm / 3.5 mm phono
      • RCA
      • Spade Lugs
      • LEMO
      • Circular Connectors
      • Any commercially available connectors and custom options available