Category
Manual Retractable Sensor Housings
Manually retract pH and analysis sensors for service without stopping the process.
A manual retractable housing lets you pull a pH, conductivity or optical sensor out of a live process into a cleaning chamber by hand, clean or calibrate it, and put it back, without stopping production or draining the line. Exner's EXtract 810M to 850M cover stainless steel, Alloy and plastic construction up to 16 bar and 140 °C.
9 Products · Retractable Housings - Manual
EXtract 810M
Manual retractable probe housing, stainless steel, up to 107mm immersion, 16 bar/140°C
EXtract 811M
Manual retractable probe housing, stainless steel, up to 207mm immersion, 16 bar/140°C
EXtract 815M
Manual retractable probe housing for DN25 weld-in socket, PTFE scraper, 90mm immersion
EXtract 820M
Manual retractable probe housing, PP/PVDF/PEEK, up to 94mm immersion, 10 bar/140°C
EXtract 821M
Manual retractable probe housing, plastic, up to 194mm immersion, 10 bar/140°C
EXtract 825M
Manual retractable probe housing for DN25 weld-in socket, plastic, 70mm immersion
EXtract 830M
Manual retractable probe housing, hygienic stainless steel, EHEDG/3A, 16 bar/140°C
EXtract 840M
Manual retractable probe housing with ball valve, up to 700mm immersion, 12 bar/130°C
EXtract 850M
Simple manual retractable probe housing, steel or plastic, 76mm immersion, up to 6 bar
Selection guide
Manual Retractable Sensor Housings Guide
What a manual retractable housing is used for
A manual retractable housing is built for processes that can't be stopped but only need occasional sensor service, such as a weekly calibration. You withdraw the sensor by hand into an isolated chamber, clean or calibrate it there, then return it to the process, all without draining the line or shutting the plant down.
How to choose a manual retractable housing
- Standard duty: the EXtract 810M and 811M are stainless steel 316L or Alloy, up to 16 bar and 140 °C. The 811M extends immersion to 207 mm for deeper vessels.
- Weld-in socket: the 815M fits a DN25 weld-in socket directly.
- Lower pressure, plastic media: the 820M and 821M are PP, PVDF or PEEK, up to 10 bar and 140 °C, with the 821M reaching 194 mm immersion.
- Dirty or scaling media: the 825M adds an integrated PTFE scraper to keep the sensor clean as it's withdrawn.
- Hygienic process: the 830M has EHEDG / 3-A approved connections, up to 16 bar.
- Long immersion or high safety: the 840M reaches up to 700 mm immersion with a ball valve and a safety lock against unlocking under pressure.
- Simple, low-pressure duty: the 850M is a basic 120 mm sensor housing up to 6 bar.
For automated cleaning and calibration instead of hand operation, see pneumatic retractable housings.
FAQ
Common questions
How does a manual retractable housing work?
You withdraw the sensor by hand from the process into a built-in cleaning chamber, isolated by a valve, so the medium stays contained. There you clean or calibrate the sensor, then push it back into the process. No production stoppage or line draining is needed.
Can I retract the sensor under process pressure?
Yes, within each model's rated pressure. The EXtract 810M and 811M work up to 16 bar, and the 840M adds a safety lock that stops the housing being opened if the process pressure is still too high to do so safely.
Which manual retractable housing suits food or dairy processing?
The EXtract 830M, with EHEDG / 3-A approved hygienic connections and stainless steel construction, is built for cleanable mounting in food and beverage lines up to 16 bar.
Which model handles dirty or scaling media?
The EXtract 825M, which adds an integrated PTFE scraper that wipes the sensor as it's withdrawn, keeping fouling media from building up on the tip between services.
How deep can a manual retractable housing reach?
It depends on the model: the standard EXtract 810M reaches 107 mm, the 811M extends to 207 mm, and the 840M, with its ball valve and safety lock, reaches up to 700 mm for deeper tanks or channels.
Is a plastic manual retractable housing available?
Yes. The EXtract 820M and 821M are PP, PVDF or PEEK, rated up to 10 bar and 140 °C, for media that would corrode stainless steel. The 825M plastic version adds a PTFE scraper for rougher media.
Need help?
Can't find what you need?
Our team helps you select the right retractable housings - manual products for your application. Request a quote or discuss your requirements.
Expert product guidance
Tailored selection of retractable housings - manual instruments
Custom solutions
Instruments customized for your specific industrial setup
Trusted global brands
Full warranty and official documentation support