Hamilton Retractex Retractable Sensor Housings

Hamilton Retractex and RetractoFit are retractable sensor housings that let you pull a sensor out of a running process to clean, calibrate or replace it. They are designed for 12 mm sensors with PG13.5 thread. Insertion without a sensor is not possible, which is part of the integrated safety concept, and a window allows the seals to be checked for leakage. The Retractex range is available in manual and pneumatic versions for pressures up to 16 bar g. Mikron Proses (Üsküdar, Istanbul) supplies Hamilton housings in Turkey and provides application consulting on housing selection for your process connection and sensor length.

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Which housing for which process

Retractex B was designed for sanitary applications in biotechnology, food and beverage and the pharmaceutical industry. Its compact design with a stroke of only 36 mm keeps wear on seals to a minimum. With the patented HyCIP cleaning principle for Ingold sockets, the cleaning solution is directed between housing and socket up to the process seal, so the sensor and the relevant seals are cleaned in place.

Retractex BC and Retractex C are designed for applications in the chemical industry. Both are available with steel or plastic wetted parts. Retractex C LT uses 325 mm sensors and has an insertion depth of up to 207 mm with the same 36 mm travel of the insertion tube.

RetractoFit is a separate family. RetractoFit Bio is built for hygienic applications in biotechnology, food and beverage and pharmaceutical processes, with a special rinsing chamber. RetractoFit Easy is a straightforward housing in stainless steel or plastic for tanks and pipes.

Retractable housings compared

Housing	Drive	Pressure	Wetted parts	Sensor length
Retractex B	Manual (M) or pneumatic	16 bar g at 120 °C; 10 bar g at 140 °C	Stainless steel 1.4404	225 mm
Retractex BC Steel / Plastic	Manual (M) or pneumatic	16 bar g at 120 °C; 10 bar g at 140 °C	Steel 1.4404 or alloy C22; PP, PVDF or PEEK	225 mm
Retractex C Steel / Plastic	Manual (M) or pneumatic	16 bar g at 120 °C; 10 bar g at 140 °C	Steel 1.4404 or 2.4602; PVDF, PEEK or PP	225 mm
Retractex C LT Steel / Plastic	Manual (M) or pneumatic	16 bar g at 120 °C; 10 bar g at 140 °C	Steel 1.4404 or 2.4602; PVDF or PEEK	325 mm
RetractoFit Bio	Red-button operated	0 to 6 bar g	Stainless steel 1.4435, EPDM	225 mm
RetractoFit Easy	Manually operated	0 to 6 bar	Stainless steel 1.4404 or PP	120 mm

Manual or pneumatic drive, and RetractoControl 2

Every Retractex model can be ordered with manual or pneumatic drive. In the product names, the “M” suffix marks the manual version (for example Retractex B M); names without a suffix are pneumatic. For lines that need frequent retraction and cleaning cycles, RetractoControl 2 is an automated electro-pneumatic control system developed for the Retractex housings. It is a plug-and-play solution for automatic sensor retraction and cleaning, with customizable programming.

Maintenance and service kits

When the housing is retracted, the PTFE scraper with its o-ring keeps process deposits out of the housing. In the cleaning position the sensor can be cleaned while the process keeps running. Wetted seals are available in EPDM, FKM or FFKM and are replaced with service kits. For static, weld-in and flow-through housings, see Hamilton fittings and flow cells. For the sensors that fit these housings, see Hamilton pH and ORP process sensors and Hamilton dissolved oxygen sensors.