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AlpHa Measurement Solutions |
pH in Semiconductor

pH in Semiconductor

The semiconductor industry fabricates chipsets, wafers, and printed circuit boards. These processes require ultrapure water for cleaning, rinsing, etching, and surface conditioning. pH measurement is one of key parameters monitored to ensure the purity and utility of water in this application. The pH of ultrapure water can trend more acidic over time if not treated properly. Dropping pH values are typically attributed to the tendency for ultrapure water to absorb carbon dioxide from the air which creates carbonic acid. The equipment used to produce ultrapure water employ pH sensors in the process to ensure the finished or process water is of the expected quality.
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  • pH Range: 0 to 14 pH
  • Response Time: 10s 
  • Low Ionic Strength Response Time: < 30s 
  • Drift: ±0.05 pH (in 24 hours) 
  • Accuracy: ±0.02 pH 
  • Temperature Range: -5 to 135°C  
  • HF Resistant Option
  • Low Ionic Strength Compatibility
  • Warranty: 12 Months 
  • Form Factor
    • 12 mm
    • Process Body
    • Cartridge
    • Custom Options Available
  • Housing Material Options
    • Ryton® (PPS)
    • ABS
    • Epoxy
    • Polycarbonate
    • Kynar ® (PVDF)
    • Polyethylene
    • PEEK
    • PVC / CPVC
    • Teflon ™ (PTFE)
    • Ultem® (PEI)
    • Metal
      • Stainless Steel
      • Other Metals Available
    • Glass
  • 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
    • Single Junction
    • Double Junction
    • Custom Options Available
  • Reference Junction Material / Design
    • Ceramic Pin / Annular / Disc
    • Fiber / Pellon
    • Porous Plastic (PTFE / HDPE / PP)
    • 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)
      • BNC
      • DIN
      • MOLEX
      • Mil-spec
      • 2.5 mm / 3.5 mm phono
      • RCA
      • Spade Lugs
      • Tinned Leads
      • LEMO
      • Circular connectors
      • Any commercially available connectors and custom options available