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Process pH Electrode Selection Guide

The following selection table is provided as quick reference for process pH electrode selection.

Application	Low cost	Flat Surface, Self Cleaning
Standard Use	S200CD, S222CD S265CD,S267CD	All models Flat-surface, self-cleaning, S8000
Slurry Applications	Not available. See next column.	All models Flat-surface, self-cleaning, S8000
Viscous Materials	Not available. See next column.	All models Flat-surface, self-cleaning, S8000
Low Ionic Conditions	970070LC- low ionic version of S200CD-LC 970xxx customer number. Available in all models. Contact Sensorex for part numbers	970xxx customer number. Available in all models S650CD-LC for submersion pH (CPVC) S645CD-LC for by-pass pH (CPVC) S655CD-LC for insertion/wet tap pH (CPVC) S655CD-ORP-LI for insertion/wet tap ORP (CPVC) S660CD-LC for in-line (3/4") pH (CPVC) S661CD-LC for in-line (1") pH (CPVC)
Temperature Above 160° F	970204 high temp version of S200CD-HT Also available in all other models contact Sensorex for part numbers	S8000 For in-line models S660CD, S661CD and S662CD versions. Other mounting styles require 970xxx customer number: S645CD-HT for side-stream (CPVC) S645KD-HT for side-stream (PVDF) S650CD-HT for submersion (CPVC) S650KD-HT for submersion pH (PVDF) S655CD-HT for insertion pH (CPVC) S655KD-HT for insertion pH (PVDF)
HF (hydrofluoric acid)	Not available. See next column	Add HF to end of part number example: Submersion model S650CD becomes S650CDHF
Ground Loop Problems	Not available. See next column	S8000 See Ground Loop Interrupt Electrodes
Etchants (nickel Sulfamate...)	Not available. See next column	Silica based reference gel use 970XXX numbers: S645CD-SI for by-pass (CPVC) S645KD-SI for by-pass (PVDF)
Mixed Water and Solvents	Not available. See next column	S8000 PVDF versions of electrodes –See Flat Surface, Self-Cleaning pH Electrodes
Horizontal or Upside Down Mounting	Not available. See next column	Standard for insertion model (S655CD,S655KD) Not available in submersion mount 970XXX numbers for other mounting styles: S660CD-HM for in-line 3/4" (CPVC) contact Sensorex for models not listed
Heavy metals, sulfides, cyanide, proteins in sample (Cd, Zn,…)	S200CD, S222CD S265CD, S267CD	S8000 All models See Flat-surface, self-cleaning
Water, Oil Mixtures	Not available. See next column	S645CD and FC60C (Accelerates sample past sensor faster to prevent oil build-up and fouling)
Liquids Containing Dissolved Gases	Not available. See next column	See Horizontal Mounting above (Reduces penetration of dissolved gases into electrode)
High pH (up to pH 14)	S200CD All models	S8000 All Models See Flat-surface, self-cleaning
Low pH <2	S200CD	S8000 All models See Flat-surface, self-cleaning