Conductivity / Resistivity Electrode — Water/Aqueous
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What LibertyCES's vendor documentation shows
The publishable rule of thumb from Signet's own operating-range chart: the higher the cell constant, the more concentrated and aggressive the chemical the electrode is designed for. UPW/USP/rinse water uses the 0.01 cell (2818/2819/2839); bottled water the 0.1 cell; cooling tower waste waters the 1.0 or 10.0 cell; deionization regenerant chemicals, alkali cleaners and acids/bases the 10.0 or 20.0 cell. The salt-water-versus-sea-water divergence is worth flagging honestly: saturated salt water pulls 316SS to F while sea water leaves it at E, so the two are not interchangeable on a datasheet — and that boundary is why Water/Aqueous and the already-captured Salts/Brines family should cross-link rather than absorb each other.
Materials documented for this service
- 316SS or Titanium body with carbon-fiber-reinforced PTFE insulator and EPDM O-rings (2818-2821)
- CPVC body with 316SS electrodes (2822)
- 316SS with PEEK insulator (2823)
- PVDF insulator and process connection (2839-2842)
- Hastelloy-C, Monel and Titanium electrodes available on special order
- Flowline chart: 316SS rates F on saturated salt water at BOTH 40°C and 80°C, but E on sea water at both — a real, non-obvious divergence between two similar-looking aqueous media
Products cited for this service
Real Specifications
| GF Signet 2818/2819 range/cell constant | 0.01 cell, 0.055-100 µS (18.2MΩ-10KΩ) | gf-signet-instrumentation-catalog.md |
| GF Signet 2823 range/cell constant | 20.0 cell, 200-400,000 µS — only cell explicitly rated for acids/bases/concentrated chemicals | gf-signet-instrumentation-catalog.md |
| GF Signet 2818-2821 max temperature/pressure | 100°C @ 6.9 bar (Polypro fitting) / 120°C @ 13.8 bar (SS fitting) | gf-signet-instrumentation-catalog.md |
| GF Signet 2823 max temperature/pressure | 150°C @ 6.9 bar | gf-signet-instrumentation-catalog.md |
| Flowline chart: 316SS rating, saturated salt water | F (poor) at both 40°C and 80°C | flowline-chemical-compatibility.csv |
| Flowline chart: 316SS rating, sea water | E (excellent) at both 40°C and 80°C | flowline-chemical-compatibility.csv |
Flowline's own compatibility chart shows 316SS is not interchangeable between two similar-looking aqueous media: it rates only 'F' (poor) against saturated salt water at both 40°C and 80°C but rates 'E' (excellent) against sea water at the same two temperatures — assuming 'salt water' and 'sea water' behave the same way against 316SS is a real, chart-documented mistake.
The rule of thumb GF Signet's own operating-range chart makes explicit: the higher the cell constant, the more concentrated and aggressive the chemical the electrode is designed for. A 0.01 cell electrode built for ultrapure rinse water fails early if it's specified onto a 20% caustic CIP line, and the reverse — a 20.0 cell electrode on UPW — wastes resolution. Liberty CES matches the cell constant to the actual conductivity band of the process fluid, not just to 'is it water.'
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 Conductivity / Resistivity Electrode compatible with Water/Aqueous?
The publishable rule of thumb from Signet's own operating-range chart: the higher the cell constant, the more concentrated and aggressive the chemical the electrode is designed for. UPW/USP/rinse water uses the 0.01 cell (2818/2819/2839); bottled water the 0.1 cell; cooling tower waste waters the 1.0 or 10.0 cell; deionization regenerant chemicals, alkali cleaners and acids/bases the 10.0 or 20.0 cell. The salt-water-versus-sea-water divergence is worth flagging honestly: saturated salt water pulls 316SS to F while sea water leaves it at E, so the two are not interchangeable on a datasheet — and that boundary is why Water/Aqueous and the already-captured Salts/Brines family should cross-link rather than absorb each other. This is strong evidence.
What materials are documented for Conductivity / Resistivity Electrode in Water/Aqueous service?
Materials documented for this service: 316SS or Titanium body with carbon-fiber-reinforced PTFE insulator and EPDM O-rings (2818-2821), CPVC body with 316SS electrodes (2822), 316SS with PEEK insulator (2823), PVDF insulator and process connection (2839-2842), Hastelloy-C, Monel and Titanium electrodes available on special order, Flowline chart: 316SS rates F on saturated salt water at BOTH 40°C and 80°C, but E on sea water at both — a real, non-obvious divergence between two similar-looking aqueous media. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm with a spec review before final specification.
What specific Water/Aqueous chemicals does this cover?
Named chemicals in this documentation: ultrapure water, distilled water, potable water, cooling tower water, brackish water, sea water, salt water, acids/bases and concentrated cleaners (high cell constant only).
What products are cited for Conductivity / Resistivity Electrode in Water/Aqueous service?
Documented examples include GF Signet 2818/2819 (0.01 cell, 0.055-100 µS, 18.2MΩ-10KΩ; R.O., ultrapure water, resistivity), 2820 (0.1 cell, 1-1000 µS; deionized/distilled), 2821 (1.0 cell, 10-10,000 µS; distilled/drinking water, cooling tower), 2822 (10.0 cell, 100-200,000 µS, CPVC body; wastewater, salinity, brackish, sea water), 2823 (20.0 cell, 200-400,000 µS, 316SS with PEEK insulator, 150°C @ 6.9 bar; the only cell explicitly rated for acids/bases, cleaners and other concentrated chemicals), 2839-2842 (PVDF insulator, dual-threaded, 131°C @ 2.76 bar), 2850 universal sensor electronics.
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