Endress+Hauser CPS31D equivalent: Hamilton MecoTrode H
A Memosens-capable Hamilton counterpart with three ceramic junctions for the gel pH sensor CPS31D used in drinking water and pool water.
MecoTrode H for the CPS31D
- Counterpart: Hamilton MecoTrode H (Memosens, Arc, VP6, S8). It has three HP ceramic junctions and a viscous 3 M KCl electrolyte.
- Shared points: glass electrode, ceramic junction, 3 M KCl based electrolyte, Memosens option, 12 mm shaft, 120 mm length; water applications.
- Difference: MecoTrode H offers a wider temperature, pressure and pH range; its recommended minimum sample conductivity is 50 µS/cm (CPS31D standard version 100 µS/cm, AC version 50 µS/cm).
Equivalence level: Direct equivalent: same connector footprint, length, measuring principle, reference function and application area; the Hamilton side covers the full operating range of the CPS31D.
Side-by-side technical comparison
| Feature | Endress+Hauser CPS31D | Hamilton MecoTrode H |
|---|---|---|
| Measuring principle and glass | Glass electrode (pH membrane glass type A) [E1] | Glass electrode; H glass [H1] |
| pH range | pH 1-12 [E1] | 0-14 pH [H1] |
| Reference and electrolyte | Ag/AgCl; gel, 3 M KCl (option: salt ring, saturated KCl) [E1] | Everef reference; viscous 3 M KCl (Pharma, blue) [H1] |
| Junction | Ceramic; one cavity in the standard version, three cavities in the AC version [E1] | 3 HP ceramic junctions (reduce flow potential effects) [H1] |
| Recommended minimum conductivity | Standard: 100 µS/cm; AC (three cavities): 50 µS/cm [E1] | 50 µS/cm [H3] |
| Output / protocol | Memosens (digital) [E1] | Memosens, Arc (digital); VP6, S8 (analog) [H1] |
| Process connection and length | PG 13.5; Ø 12 mm; 120 mm [E1] | 12 mm shaft; a-length 120 mm (S8, VP6, Memosens, Arc); 225 mm only with Memosens; PG 13.5 mounting thread on S8-connector models [H1, H2] |
| Temperature | 0...80 °C [E1] | 0...130 °C [H3] |
| Pressure | 1-4 bar absolute [E1] | 0-16 barg (25 °C); 0-6 barg (130 °C) [H3] |
| Application | Drinking water, swimming pool water; pH compensation in free chlorine measurement [E1] | Water and wastewater, industrial processes, chemical industry [H1] |
| Certificates / Ex | Not stated in the document (Ex and sterilization are selected via the product configurator) [E1] | Not stated in the catalog; the Arc version is not for explosive environments [H1] |
Every cell carries a source code; the sources are listed below the table. Pressure values: Endress+Hauser states absolute pressure, Hamilton states gauge pressure (barg); the difference is about 1 bar.
Why it is an equivalent
- Both are maintenance-free glass pH sensors with a ceramic junction and a 3 M KCl based electrolyte, designed for water and wastewater applications.
- The three-cavity AC version of the CPS31D and the three HP ceramic junctions of the MecoTrode H serve the same purpose: reducing the measurement deviation caused by flow potential.
- The Memosens connection, 12 mm shaft and 120 mm length are the same; the operating range (temperature, pressure, pH) is wider on the Hamilton side.
Points to check when selecting
- Low conductivity: the recommended lower limit for MecoTrode H is 50 µS/cm. For drinking water with lower conductivity, Hamilton Liq-Glass PG (F glass, 2 µS/cm, -5...60 °C, 2 barg) is considered; this model has an analog S8 connector.
- Length: Memosens MecoTrode H is ordered as 120 mm and 225 mm; check that the existing housing fits the sensor length.
- Chlorine measurement: if the CPS31D is used for pH compensation in free chlorine measurement, plan the chlorine sensor and transmitter together; confirm how the pH signal reaches the chlorine measurement chain.
- Transmitter: confirm the Memosens-input transmitter and generation compatibility; the Arc version is not for explosive environments.
Sources and verification
- [E1] Endress+Hauser Technical Information TI00030C, CPS31D (together with CCS51D), edition 14.22.
- [H1] Hamilton Process Analytics Catalog 2026, MecoTrode, p.24 (specifications, order codes).
- [H2] Hamilton Process Analytics Catalog 2026, connector descriptions (S7/S8; S8 has PG13.5 mounting thread).
- [H3] Hamilton Process Analytics Catalog 2026, "Sensor Comparison" table, p.184 (MecoTrode H and Liq-Glass PG rows).
How the match was verified. The match comes from the Mikron cross-reference study (22-23 September 2026): the reference system, diaphragm and electrolyte functions of both sides were tied to manufacturer quotations, every match was compared element by element and by application area, and the result was re-checked in a separate blind test. Values come from the manufacturer documents listed above; for critical applications please confirm them against the original document and the order code.
Trademark note. Endress+Hauser, Memosens and the other competitor names mentioned are registered trademarks of their respective owners; Hamilton, Polilyte, MecoTrode, OxyFerm, Conducell, Everef, Polisolve, Arc and related names are registered trademarks of their respective owners. The names are used only to describe technical equivalence. Mikron Proses Kimyasal ve Mühendislik Çözümleri A.Ş. is not affiliated with the competitor brands mentioned.
Frequently asked questions
CPS31D counterpart, low conductivity and length.
What is the Hamilton equivalent of the Endress+Hauser CPS31D?
Hamilton MecoTrode H. Both are glass pH sensors with a ceramic junction and a gel or viscous 3 M KCl electrolyte and offer a Memosens connection option; MecoTrode H covers the operating range of the CPS31D in temperature, pressure and pH.
Can MecoTrode H be used if the drinking water conductivity is low?
The recommended minimum sample conductivity for MecoTrode H is 50 µS/cm. At lower conductivity, low-resistance glass models such as Hamilton Liq-Glass PG (2 µS/cm) or IonoTrode (0.2 µS/cm) are considered; these have analog connectors.
What information should I share when choosing an equivalent?
The full sensor code (standard or AC), sample conductivity, temperature and pressure, housing type and length, and whether free chlorine measurement is connected to the same transmitter. With this information we confirm the model together.
Other equivalence pages
Confirm the equivalent for your process
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