pH/ORP Instrument — Caustics/Bases
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What LibertyCES's vendor documentation shows
Fourth independent vendor confirmation that pH glass electrodes degrade from strong NaOH/KOH exposure.
Materials documented for this service
- Lead-free glass (degrades with NaOH/KOH abrasion)
Products cited for this service
Real Specifications
| ProMinent PHEP-H high-pH sensor range | pH 3-14 (for media >pH 12) | prominent-sensors-controllers.md |
| ProMinent PHEP-H max temperature/pressure | 80°C / 6 bar | prominent-sensors-controllers.md |
| ProMinent pH sensor glass | Lead-free glass (RoHS-compliant), all DULCOTEST sensors | prominent-sensors-controllers.md |
| GF Signet pH-glass erosion agents | Strong NaOH, KOH, or HF solutions (by abrasion) | gf-signet-instrumentation-catalog.md |
| GF Signet pH electrode replacement threshold | Used electrode reading >±0.84 pH off theoretical (vs ±0.25 pH for a healthy new electrode) | gf-signet-instrumentation-catalog.md |
| GF Signet calibration cadence — high-concentration chemical service | Every 1-2 weeks | gf-signet-instrumentation-catalog.md |
GF Signet names strong sodium hydroxide and potassium hydroxide by name as causes of pH glass electrode erosion via abrasion — a used electrode reading more than ±0.84 pH off theoretical (versus ±0.25 pH for a healthy new electrode) should be replaced, and high-concentration chemical service needs calibration every 1-2 weeks instead of the monthly cadence clean drinking water tolerates.
A pH probe rated for pH 3-14 on paper can still fail early in a caustic loop, because the failure mode isn't range — it's glass erosion from the NaOH or KOH itself, confirmed independently by GF Signet's calibration guidance and consistent with what ProMinent's own high-pH PHEP-H sensor is built to handle. Liberty CES specs the calibration/replacement cadence alongside the sensor part number on caustic service, since a wide pH range on the datasheet doesn't mean the glass survives that range indefinitely.
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Is pH/ORP Instrument compatible with Caustics/Bases?
Fourth independent vendor confirmation that pH glass electrodes degrade from strong NaOH/KOH exposure. This is strong evidence.
What materials are documented for pH/ORP Instrument in Caustics/Bases service?
Materials documented for this service: Lead-free glass (degrades with NaOH/KOH abrasion). Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm with a spec review before final specification.
What specific Caustics/Bases chemicals does this cover?
Named chemicals in this documentation: Sodium Hydroxide, Potassium Hydroxide.
What products are cited for pH/ORP Instrument in Caustics/Bases service?
Documented examples include ProMinent PHE/RHE electrode families, GF Signet 2764-2777.
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