Endress+Hauser CLS15D equivalent: Hamilton Conducell UPW
A functional counterpart for the 2-electrode contacting conductivity sensor CLS15D used in pure and ultrapure water; the Memosens connector and process connection differences are stated openly.
Conducell UPW for the CLS15D
- Counterpart: Hamilton Conducell UPW (VP6 analog or Arc digital). 2-pole contacting, 1.4435 stainless steel electrodes, designed for pure and ultrapure water.
- Shared points: measuring principle, electrode material, pure/ultrapure water, WFI and CIP monitoring applications, EPDM o-ring.
- Difference: in the Hamilton catalog Memosens exists only on pH and oxygen sensors; Conducell UPW has no Memosens output. The process connection also differs (CLS15D: NPT or Clamp; Conducell UPW: PG 13.5 or TC 1½").
Equivalence level: Equivalent with a connector difference: measuring function and application area are the same; the output (VP6/Arc instead of Memosens) and the process connection change, so a transmitter or Arc change and a housing/adapter may be needed.
Side-by-side technical comparison
| Feature | Endress+Hauser CLS15D | Hamilton Conducell UPW |
|---|---|---|
| Measuring principle | Contacting (conductive), 2 electrodes [E1] | 2-pole contacting [H1] |
| Cell constant | ...A: k = 0.01 cm⁻¹; ...B: k = 0.1 cm⁻¹ [E1] | < 0.1 /cm [H1] |
| Measuring range | ...A: 0.04-20 µS/cm; ...B: 0.10-200 µS/cm [E1] | Arc: 0.01-1500 µS/cm; analog: 0.02-2000 µS/cm [H1] |
| Output / protocol | Memosens (digital) [E1] | VP6 (analog) or Arc (digital); no Memosens option [H1, H2] |
| Electrodes and body | Electrodes: electropolished stainless steel 1.4435; shaft body: PES-GF20; EPDM o-ring (Clamp only) [E1] | Stainless steel DIN 1.4435; surface Ra < 0.4 µm; EPDM o-ring [H1] |
| Process connection | NPT ½" and ¾" thread; Clamp 1½" (ISO 2852); Ø 16 mm [E1] | PG 13.5 (120 mm) or TC 1½" (87 mm, Arc only) [H1] |
| Temperature | -20...100 °C; up to 1 hour at 140 °C for sterilization (threaded versions: 30 min maximum) [E1] | 0...130 °C (Arc: analog interface 0...110 °C, digital 0...130 °C) [H1] |
| Pressure | 13 bar absolute (20 °C); 1 bar absolute (120 °C) [E1] | 0-10 barg (130 °C) [H1] |
| Sterilization | 140 °C, up to 1 hour [E1] | Autoclave, CIP, SIP [H1] |
| Certificates | ATEX/NEPSI II 1G Ex ia IIC T3/T4/T6 Ga and IECEx (CLS15D-**G); FM/CSA (CLS15D-**O); ATEX II 3G Ex ic (CLS15D-**V) [E1] | USP 645, EP and JP compliant; wetted parts FDA compliant; traditional (analog) model ATEX and IECEx approved [H1] |
| Application | Ion exchanger monitoring, reverse osmosis, distillation, CIP cleaning (pure and ultrapure water) [E1] | Ultrapure water, pure water, water for injection (WFI), CIP monitoring [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 work on the same principle: a 2-electrode contacting cell with electropolished 1.4435 stainless steel electrodes for pure and ultrapure water.
- The application areas overlap: reverse osmosis, distillation, ion exchanger and CIP monitoring (E+H) and ultrapure water, pure water, WFI and CIP monitoring (Hamilton).
- The measuring range covers all CLS15D-A and -B versions; the Hamilton side offers a wider range and suitability for sterilization (autoclave, CIP, SIP) up to 130 °C.
Points to check when selecting
- Connector: a CLS15D connected to a Memosens-input transmitter does not work directly with Conducell UPW. Options: connect Conducell UPW Arc straight to the process control system without a transmitter, or use a suitable conductivity transmitter for the analog VP6 version.
- Process connection: for NPT ½" or ¾" threaded mounting, a housing or adapter for the PG 13.5 sensor is needed; TC 1½" instead of Clamp 1½" exists only in the Arc version (87 mm). Confirm the connection size on site.
- Cell constant: CLS15D-A gives k = 0.01 and -B k = 0.1 cm⁻¹; the Hamilton catalog states the cell constant as "< 0.1 /cm". Entering the constant correctly in the transmitter and the calibration method for USP 645 verification must be planned separately (the Hamilton UPW Simulator, REF 243580, provides a traceable resistor to verify the Arc module according to USP 645).
- Pressure: the CLS15D is rated 13 bar absolute (about 12 barg, 20 °C); Conducell UPW is rated 10 barg. This pair does not fit lines above 10 barg.
- Ex area: the CLS15D-**G/O/V codes are Ex approved; on the Hamilton side only the traditional (analog) model is ATEX and IECEx approved; confirm separately for Arc.
Sources and verification
- [E1] Endress+Hauser Technical Information TI00109C, Condumax CLS15 / CLS15D (CLS15D-...A and ...B), edition 14.14.
- [H1] Hamilton Process Analytics Catalog 2026, Conducell UPW, p.68 (specifications, order codes, UPW Simulator).
- [H2] Hamilton Process Analytics Catalog 2026, connector section (VP connectors: analog pH/ORP, conductivity; Memosens for pH and oxygen only).
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
CLS15D counterpart, connector and process connection difference.
What is the Hamilton equivalent of the Endress+Hauser CLS15D?
Hamilton Conducell UPW. Both are 2-electrode contacting sensors with 1.4435 stainless steel electrodes for pure and ultrapure water. The difference is in output and connection: CLS15D offers Memosens and NPT/Clamp, whereas Conducell UPW offers VP6 analog or Arc digital and PG 13.5 or TC 1½".
Can I use Conducell UPW if I have a Memosens-input transmitter?
In the Hamilton catalog Memosens appears only on pH and oxygen sensors; Conducell UPW has no Memosens output. Conducell UPW Arc can connect directly to the process control system without a transmitter; the analog VP6 version works with a suitable conductivity transmitter.
Can USP 645 measurement be performed with Conducell UPW?
Hamilton states that Conducell UPW is USP 645, EP and JP compliant; the UPW Simulator (REF 243580) provides a traceable resistor to verify the Arc module according to USP 645. The validation scope depends on your own measurement chain (transmitter, cable, calibration); we can review the documents together.
Other equivalence pages
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