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The SC24V is a differential pH sensor. This means that the reference is not a (liquid) junction but a glass sensor which does not respond to pH changes (within the applicable range of the sensor). 

Therefore the sensor is truly maintenance free and the output voltage of the sensor depends only on the salt concentration of the process. 

The sensor responds to pH changes rather than analyzes the accurate pH value. In that sense it is best to describe the sensor as pH control sensor rather than pH measuring sensor. 

A pH sensor measures the voltage that the pH membrane measures as function of the pH value of the process sample. 

This voltage is then compared with the mV output of a reference cell that is independent on the pH value of the sensor In most pH control applications the salt concentration is rather constant, so the output of the SC24V differential sensor is only dependent on the pH of the process. 

A rule of thumb is that a change in salt concentration of ±25% has an effect of less than 0.1 pH on the pH reading.
Features
  • VP connector
  • Sterilisable pH sensor
  • No reference electrode or junction
  • Maintenance free pH sensor
  • No diffusion = high stability
  • Platinum ORP element for redox

1 - 2 of 2 Part Numbers
SC24V-ALN26-120
SC24V-ALN26-120
  • Sensor Type - Combined 12 mm 4 in 1 Differential pH Sensor
  • Length - 4.72" (120 mm)
SC24V-ALN26-225
SC24V-ALN26-225
  • Sensor Type - Combined 12 mm 4 in 1 Differential pH Sensor
  • Length - 8.85" (225 mm)
1 - 2 of 2 Part Numbers

Specifications

Applications

  • Chemical: Brine
  • High Process Pressures
  • High Process Temperatures
  • Petrochemical: Sour Water Stripper [also Quench (Tower) Water]

Approvals & Certifications

  • IEC

Electrical Connectors

  • PG 13.5

Environmental Protection

  • IP65
  • Watertight

Materials of Construction

  • Silver Chloride Reference System

Measuring Range

  • pH: 4 to 14 pH

Metric Connection

  • M25 x 1.5 Male

NACE & NIST

  • NIST

Pressure Range

  • psi: 0 to 145 (kPa: 0 to 1,000, bar: 0 to 10)

Sensor, Probe Diameter

  • 0.47” (12 mm)

Sensor, Probe Length

  • 4.72” (120 mm)
  • 8.85” (225 mm)

Sensor, Probe Material

  • Ceramic
  • pNa Glass
  • PTFE
  • Zirconium

Temperature Range

  • 0° to 120° C (32° to 248° F)

  • Chemical: Brine
  • High Process Pressures
  • High Process Temperatures
  • Petrochemical: Sour Water Stripper [also Quench (Tower) Water]
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