Hamilton Process Fittings and Flow Cells (FlexiFit, StatoFlex, FlowChamber, FlowCell, FlexiFlow, MasterFit)

Hamilton sensor housings connect a process sensor to the line as a fixed fitting, an immersion fitting or a flow-through cell. The 2026 Hamilton catalog groups housings into static, weld-in, retractable, pressurized and flow-through housings, plus service kits. This page covers FlexiFit, StatoFlex, FlowChamber, the FlowCell family, FlexiFlow and MasterFit, and adds RetractoFit BV, a retractable housing with a ball valve. Mikron Proses (Üsküdar, Istanbul) supplies Hamilton housings in Turkey and provides application consulting on matching the fitting to your process connection, pressure and temperature.

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FlexiFit: static housing for 120 mm sensors

FlexiFit is a family of static (non-retractable) housings for 120 mm sensors with PG 13.5 thread, designed to match many process connection standards. All FlexiFit models have EPDM o-rings and an electropolished surface (Ra < 0.4 µm, N5) that is documented by a certificate. They are suitable for autoclaving, CIP and SIP procedures. The pressure range is 0 to 16 bar g and the temperature range is -10 to 140 °C.

By process connection, the family has three main variants:

• FlexiFit Bio and FlexiFit U Bio: Ingold G 1¼” connection, with protective pins (REF 237331-OP) and without pins (REF 237380-OP).
• FlexiFit VV-0 and FlexiFit VV-15: Varivent connection, at 0° or 15° (REF 237344 and 237345).
• FlexiFit TC50-33, U TC50 and U TC50-15°-IL: TriClamp 1.5” (TC50) connection, straight or at 15°, with or without pins.

Two weld-in sockets can be used with FlexiFit housings:

• Safety Socket: a hygienic weld-in socket in stainless steel 1.4404 or 1.4435, for 0 to 50 bar g and -30 to 160 °C, with a G 1¼ process connection. It comes in three o-ring positions (OP 25, 50 and 55) and two angles (0° and 15°). The socket seals only if the o-ring of the housing is exactly at the right place; if the process is under pressure, a dripping medium is a hint that the housing should not be loosened entirely.
• Hygienic Socket: made of stainless steel 1.4404, 1.4435 or 1.4571, or Hastelloy 2.4602, for 0 to 16 bar g and -10 to 140 °C, with 120 mm PG 13.5 sensors. Two “Live Guard” openings give an indication of sealing failures.

StatoFlex: immersion fitting

StatoFlex is an immersion fitting for processes that need a DN50 or ANSI 2” connection, such as open channels or tanks. An integrated orbital spray cleaning system is available as an option and cleans the sensor area mechanically. There are two material options: stainless steel (1.4404 / 316L, 0 to 10 bar, -10 to 140 °C up to 4 bar or -10 to 100 °C up to 10 bar) and plastic, PP (0 to 4 bar) or PVDF (0 to 6 bar). The immersion length can be chosen from 0.5 m to 2.5 m in 0.5 m steps. It accepts 120 mm PG 13.5 sensors as well as MNPT ¾” and MNPT 1” sensor connections.

FlowChamber: flow-through fitting

FlowChamber is a flow-through fitting engineered to work with retractable sensor housings and to position the sensor correctly in the fluid flow. It is offered in PVDF plastic (resistant to chemical corrosion; max. 6 bar and 120 °C) and in stainless steel 1.4571 / 316Ti, optionally ETFE-lined (max. 16 bar and 140 °C). Process connection: flange DN25, DN50, ANSI 1” or ANSI 2”, or a welded pipe. Sensor side, steel version: flange DN50 or ANSI 2”, or G 1¼”, G ¾” or NPT ¾” thread; plastic version: flange DN50 or ANSI 2”. The flow direction is 90° or 180°.

FlowCell family and FlexiFlow: flow-through cells

Hamilton’s FlowCells put the sensor into measurement directly in the process line or in a bypass:

• FlowCell (REF 242585) and FlowCell XL (REF 242590): PEEK insert with stainless steel 1.4435 outer parts and TriClamp or Swagelok connections. The standard seal is EPDM (FDA approved); an FFKM option is available. They work at 0 to 16 bar g and -10 to 140 °C. The internal volume is approx. 8 mL for FlowCell and approx. 25 mL for FlowCell XL (within the PEEK cell only). Two tube positions (Tube A and Tube B) allow one or two measuring points with the compatible sensors listed above. The Dencytee sensor is compatible only with FlowCell XL, and Conducell UPW only with the TriClamp versions of FlowCell.
• FlowCell UR (REF 243900): a modular sensor housing that supports pH, dissolved oxygen and conductivity sensors as well as advanced sensors such as Dencytee and UPW. It offers EPDM, FKM and FFKM seals and installation of a single sensor or two sensors (Tube A and Tube B).
• FlexiFlow SL 10 (REF 237340): a compact flow-through cell in which the sample enters from the bottom at low flow speed and leaves at the side. It is intended for pH or oxygen measurement in ion-weak media. It is not suitable for Conducell and Incyte sensors.

MasterFit and RetractoFit BV

MasterFit represents the pressurized housings group in Hamilton’s housing range. Contact us for the model and connection option that suits your process.

RetractoFit BV is a retractable probe housing that holds a sensor securely and allows extraction, cleaning and calibration without stopping the overall process. A ball valve closes the process; the hygienic design helps to prevent contamination. See the technical specifications above for materials, pressure, temperature and process connections. For the other retractable housings, see Hamilton Retractex retractable housings.