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M-21 pH Probe
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M-21 – pH Sensor

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$665.00 Excl. GST

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General purpose ¾” NPT pH sensor with long insertion length

Total: $665.00

All prices are in NZ$, and GST exclusive and are subject to change without notice.

Product Details

The Model 21 process pH sensor features the Plunger pH electrode design which permits 360° sensor mounting. The porous Teflon® liquid junction resists fouling and chemical attack. Double junction reference cells increase the service life in applications containing sulfides (H2S) and metals such as lead, mercury and silver.

The new cast-in-place solid reference electrolyte helps maintain a constant reference cell potential by resisting dilution over time with pressure and temperature changes. The new capillary temperature sensor design places the Pt100 TC behind the pH sensitive membrane for accurate temperature compensation and measurement.

The IP68 environmental rating protects the high impedance pH electrode signal from moisture resulting from condensate build up in submersion pipes.

M-21 Features

  • Patented Plunger pH Electrode
  • Choice of High Temperature, High pH Measurement
  • Patented Porous Teflon® Liquid Junctions
  • Double Junction Reference Cell
  • New Cast-In-Place Solid Reference Electrolyte
  • Optional Integral Unity Gain Preamplifier
  • New Capillary TC Design
  • New Non-Metallic Solution Ground

Applications

  • Water and Wastewater Treatment
  • Coagulation and Flocculation
  • Process Monitoring and Control
  • Acid / Caustic Neutralization
  • Plant Effluent

Technical Specs

TYPEM-21
Body MaterialRyton®
O-RingsViton®
Measuring Range0~14 pH
Temperature Range0°C~80°C Standard Version
0°C~110°C High Temp Version
Pressure Range0~6.9 bar Standard Version
0~10.3 bar High Temp Version
Cable Length4.6m
Drift< 2.0 mV/week
Response Time @ 25°C95% of reading in 10 seconds
Asymmetry Potential7.0 pH ± 0.2 pH
Theoretical Slope± 59.16 mV / pH unit @ 25°C
Sodium Error< 0.05 pH in 0.1 Molar Na+ Ion @ 12.8 pH
pH Glass Bulb Impedance @ 25°C150 Megohms
Insertion Length58.4 mm (2.3")

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