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Model D540 (12mm)

After several years of refinement we are introducing our latest set of improvements all bundled up in one new sensor, the OxyProbe® II.

The new membrane design is modeled after our successful 25 mm membrane cartridge. It has an expandable inner Silicone bladder that holds the electrolyte within a 316L stainless steel cage. During SIP processes or during autoclaving the electrolyte turns to steam, but does not distend the measurement membrane because the internal bladder expands first, taking the pressure off the sensitive measurement area. This allows us to have a maximum of electrolyte present, with minimum risk of damage to the sensor. The new membrane cartridge design is easy to use and durable enough to be used many times over if necessary.

Ordering Information

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Our standard D9 connector has hermetically sealed gold-plated contacts in a glass insulator that offers the ultimate in signal isolation and transmission. For customers with installed VarioPin cable systems we also offer the VP connector as a standard option on all of our designs.

Hygienic Sensor Design

  • Microrganisms cannot adhere to the sensor surface due to the enhanced finish (N5/Ra15µ in Quality).
  • The sensor is fully sterilizable and autoclavable.

Time-Saving Maintenance

  • Membrane body and sensor inner body can be changed out very quickly. A simple membrane body replacement takes just two minutes and can be made on site by the user.
  • Due to the modular design, the different sensors have basically the same spare parts. This minimizes inventory stocking requirements.

Features Overview

  • Autoclavable and steam sterilizable.
  • Accurate measurement and quick response.
  • Long lasting and easy to maintain membranes.
  • FDA positive listed materials of construction.
  • Hygienically polished N5 surface finish (Max. Ra15µ in).
  • Wetted O-rings comply with FDA and USP Class VI standards.

Other Highlights

  • Comes with either waterproof VarioPin or D9 connector.
  • T-Pull connector versions allow for easy removal from fermenter and reduces strain on cable.
  • Variety of sensor lengths available.

Replaceable Anode/Cathode Assembly

A concept pioneered by Broadley-James, this unique assembly permits the sensor to be repaired quickly and reliably. Send your sensors to us for rebuild and save about half the price of purchasing a complete new sensor assembly!

The internal seals of an Oxyprobe are all mechanical seals using o-rings. There are no adhesives to leak or fail in process, making this a more rugged and reliable sensor. Replacing the cathode is also much easier and faster since there is no sealant to clean from the threads. No sealant also makes the job of replacing the cathode much faster and cleaner.

  • O-rings: AG-SR15
  • Membrane Cartridges: Single, Four and 16 piece Cartridge Kits

How to choose a sensor

  • Determine how far the sensor should project into the vessel.
  • Decide whether a right angle connector is preferred over a straight connector.
  • Choose the correct cable length and connector. All DO sensors require cable and connector assemblies.

It is important to regularly maintain the sensors by inspecting and calibrating them. The membrane cartridge should be checked and refilled prior to every use.

12 mm OxyProbe Sensors Straight

D9 Sensor Part Number Variopin Sensor Part Number
120 mm D540-B120-PT-D9 D540-B120-PT-VP
220 mm D540-B220-PT-D9 D540-B220-PT-VP
320 mm D540-B320-PT-D9 D540-B320-PT-VP
420 mm D540-B420-PT-D9 D540-B420-PT-VP