SM21 Electrode for pH/Redox

Brand: Yokogawa Electric Corporation

The glass membrane is the most important part of the complete pH measuring loop. 

pH sensitive glass has the particular property that alkali metal ions present in the texture of the glass are exchanged with H+ ions of the liquid.

The selection of the correct type of glass electrode depends on both the type of glass membrane thickness of the glass membrane. 

In SM21 "Single glass electrodes" there are two types of glass are available, as described here: 
  • "G" glass: This is used for the membranes of electrodes in processes where the nominal pH value varies between pH0 and pH10. Since this type of glass has a wide application range it is also termed “general-purpose” glass. 
  • "L" glass: The application of “L” glass is for measurements in alkaline media with high process temperatures.
Features
  • Low resistance glass for fast response and sensitivity
  • High resistance glass for chemical resistance
  • L-glass sensors for high temperature chemically harsh applications
  • G-glass sensors for all general applications
  • "All glass" construction
  • Dimensions and design meet the requirements of DIN 19263
  • Isothermal point of intersection: pH 7 (nominal value at 0 mV)
  • Maximum pressure: 1,000 kPa (10 bar)
  • Metal foil screening
  • Bulb membrane for general-purpose
  • Dome shaped membrane for “Heavy Duty” applications

Specifications

Applications

  • Harsh Applications
  • High Temperature Applications
  • Light, Laboratory

Approvals & Certifications

  • IEC

BSP Connection

  • G 1/4” Male

Electrical Connectors

  • DIN 19263
  • PG 13.5

Environmental Protection

  • IP65
  • Watertight

Maximum System Pressure

  • psi: 145 (kPa: 1,000, bar: 10) - Glass Sensors

NACE & NIST

  • NIST

Resistance

  • Glass Resistance: 25 to 900 megaohms

Sensor, Probe Diameter

  • 0.47” (12 mm)

Sensor, Probe Length

  • 4.72” (120 mm)

Sensor, Probe Material

  • Ceramic
  • pNa Glass
  • PTFE
  • Zirconium

Sensor, Probe Type

  • Bulb

Temperature Range

  • 0° to 130° C (32° to 266° F) - Glass Sensors
show more