Endress+Hauser COS22D equivalent: Hamilton OxyFerm FDA
A Hamilton counterpart for the Memosens amperometric dissolved oxygen sensor used in bioprocess, pharmaceutical and beverage lines; the pressure and trace-level differences are stated openly.
OxyFerm FDA for the COS22D
- Counterpart: Hamilton OxyFerm FDA (Memosens, VP6 and T82 connectors). Amperometric, 1.4435 stainless steel, 12 mm shaft, FDA-approved membrane.
- Shared points: amperometric principle, hygienic steel body, autoclave, CIP and SIP suitability, Memosens option.
- Difference: OxyFerm FDA is limited to 4 barg (COS22D: from ambient pressure to 12 bar absolute) and its measuring range starts at 10 ppb. For trace level or higher pressure, OxyGold G (VP6 analog) is listed below.
Equivalence level: Equivalent with notes: same principle, connector footprint and application; the documented differences are the upper pressure limit and the lower trace-level limit.
Side-by-side technical comparison
| Feature | Endress+Hauser COS22D | Hamilton OxyFerm FDA |
|---|---|---|
| Measuring principle | Amperometric (silver/platinum electrode combination; gold cathode in the -*4 version) [E1] | Amperometric (electrochemical reduction of oxygen); Oxylyte electrolyte [H1] |
| Measuring range | COS22D-*1: 0.01-60 mg/l (0-600 %SAT); COS22D-*3 and *4 (trace): 0.001-10 mg/l [E1] | 10 ppb - 40 ppm [H1] |
| Output / protocol | Memosens (digital) [E1] | Memosens (MS); VP6 and T82 (analog) [H1] |
| Body material | Stainless steel 1.4435 (AISI 316L), titanium or Alloy C22 (depending on version) [E1] | Stainless steel 1.4435; surface Ra < 0.4 µm; EPDM o-ring [H1] |
| Process connection and length | PG 13.5; Ø 12 mm; 120 / 225 / 360 / 420 mm (depending on version) [E1] | 12 mm shaft (XL: 25 mm); 120 / 160 / 225 / 325 / 425 mm; housing compatibility to be confirmed from the catalog housing section [H1] |
| Temperature | -5...135 °C (COS22D-*4: 80 °C) [E1] | 0...130 °C (Arc: analog interface 0...110 °C, digital 0...130 °C) [H1] |
| Pressure | From ambient pressure up to 12 bar absolute [E1] | 0-4 barg [H1] |
| Sterilization | SIP/CIP, up to 140 °C; autoclave 140 °C, 30 min (COS22D-*1 and *3) [E1] | Autoclave, CIP, SIP [H1] |
| Certificates / hygiene | EHEDG Type EL Class I; Reg. (EC) 1935/2004; FDA-compliant material declaration; COS22D-BA: ATEX II 1G Ex ia IIC, IECEx, FM/CSA [E1] | FDA-approved membrane; Ex approval not stated in the catalog for this sensor [H1] |
| Application | Pharmaceutical and biotechnology, beverage, chemical, water treatment (boiler feedwater, WFI), inertization [E1] | Pharmaceutical, biotechnology, food and beverage, fermentation [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 membrane amperometric DO sensors; they carry a hygienic 1.4435 steel body, FDA-compliant membrane/materials and autoclave, CIP and SIP suitability.
- The Memosens connector option and the 12 mm shaft allow the existing Memosens-input transmitter and housing arrangement to be kept.
- COS21D-A (standard) and OxyFerm FDA match directly in range, principle and application; for the COS22D versions the pressure and trace-level notes apply.
Points to check when selecting
- Pressure: the COS22D is rated 12 bar absolute (about 11 barg); OxyFerm FDA is rated 4 barg. This pair does not fit if the process is above 4 barg.
- Trace level: COS22D-*3 and *4 go down to about 1 ppb; OxyFerm FDA starts at 10 ppb. For measurement below 10 ppb and for higher pressure, Hamilton OxyGold G (1 ppb - 40 ppm, 0...130 °C, 12 barg) is considered; this model has a VP6 analog connector (no Memosens).
- Hydrogen: the COS22D-*4 is designed for applications where hydrogen cross-sensitivity is a problem; as no documented Hamilton counterpart exists for this feature, such applications need a separate assessment.
- Ex area: COS22D-BA is Ex approved; for the Hamilton side no Ex approval is stated for this sensor in the catalog.
- Transmitter: confirm the Memosens-input transmitter and generation compatibility.
Sources and verification
- [E1] Endress+Hauser Technical Information TI00446C, Oxymax COS22 / COS22D (COS22D-*1, *3, *4), edition 04.15.
- [H1] Hamilton Process Analytics Catalog 2026, OxyFerm FDA, p.106 (specifications, order codes) and "Sensor Comparison" table, p.184 onwards.
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
COS22D counterpart, pressure difference and trace level.
What is the Hamilton equivalent of the Endress+Hauser COS22D?
For Memosens use, Hamilton OxyFerm FDA; it is amperometric, has a hygienic steel body and is autoclave, CIP and SIP compatible. Pressure is limited to 4 barg. For trace level and higher pressure, Hamilton OxyGold G (VP6 analog) is considered.
Does OxyFerm FDA cover the 12 bar rating of the COS22D?
No. The COS22D value of 12 bar is absolute pressure (about 11 barg); OxyFerm FDA is rated 0-4 barg. If the process pressure is below 4 barg it is suitable; above that, a model rated for 12 barg such as OxyGold G is needed.
What information should I share when choosing an equivalent?
The full sensor code (e.g. COS22D-*1 or *3), measuring range (standard or trace), process temperature and pressure (absolute or gauge), sterilization method, Ex area requirement, shaft length and transmitter model. With this information we confirm the model together.
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