F-835 Autoclavable pH Electrode

The Model F-835 FermProbe^® steam sterilisable and autoclavable pH electrode is built to withstand repeated high temperature sterilisation by pressurized steam. The Pg13.5 cap design provides for insertion and removal of the electrode from its housing.

Each FermProbe is steam sterilised for one hour at 135°C before final QA tests in order to insure the highest level of electrode reliability.

All FermProbes have two built-in electrolyte chambers that act to protect and isolate the sensitive inner AgCl reference half-cell. This "double junction", dual chamber design effectively prevents the most common failure modes of pH electrodes in biopharmaceutical applications.

Metric FermProbe Autoclavable pH Electrode

This autoclavable pH electrode style features a metric Pg13.5 threaded polymer cap that allows it to be used with European style electrode housings. Autoclavable as well as steam sterilisable, this style of pH FermProbe is the first choice for use with small autoclavable benchtop vessels. Available only in the disconnect cap style. Cables must be ordered separately.

Features

• Double-Junction Silver/Silver Chloride reference element for the ultimate in stability and resistance to contamination.
• Specifically designed for multiple SIP, CIP, or Autoclave cycles.
• Withstands exposure to harsh CIP solutions.
• Metric threaded PG13.5 cap is compatible with a wide range of bioprocess electrode housings.
• Rugged, low-impedance pH bulb provides fast and precise pH measurements even after prolonged steam exposure.

Specifications

• 0 - 13 pH range
• Steam sterilisable to 135° C
• 150 psig max. pressure
• Double junction, Ag-AgCl reference system
• Metric Pg13.5 threaded disconnect cap

Choose Electrode Model

If the electrode needs to fit an existing cable, check cable connector. If it has a male connector, an F-635 or F-835 FermProbe is required. Another guideline is to note the connector’s colour. If the cable connector is black, use the F-635 or F-835 Fermprobe.

Choose Electrode Length

Benchtop Applications

The electrode length is from the base of the cap to the tip of the electrode (the glass part of the electrode).

SIP Tank Applications

If you have already chosen a sensor housing, select an electrode length with the same Class designation as the housing. The housing ordering information box also lists the correct electrode length to order. If you have not already chosen the housing, please review the recommendations next to each electrode model below.

Confirm Cable Length and Connector

Model F-835 pH electrodes require disconnect cable and connector assemblies (see the Accessories tab for information about compatible cables).

Ordering Information

Model F-835 pH FermProbe with Standard Metric Cap

Note: the vessel sizes are for guidance only – check your own vessel dimensions or the length of the electrode you are replacing.

Recommended Housings

The F-835 pH Electrode has a metric Pg13.5 threaded polymer cap allowing it to be used with European style housings. We would recommend the following Broadley-James sensor housings for use with the  Model F-835 FermProbe^® steam sterilisable and autoclavable pH electrode:

• Model 335 Unguarded Sensor Housing – Standard 25mm (Pg 13.5), typical vessel insertion lengths 52mm & 128mm
• Model 325 Guarded Sensor Housing – Standard 25mm (Pg 13.5), typical vessel insertion lengths 37mm & 113mm
• Model 346 Sensor Unguarded Housing – Braun Safety Port 25 mm (Pg13.5), typical vessel insertion length 25mm
• Model 356 Sensor Guarded Housing – Braun Safety Port 25 mm (Pg13.5), typical vessel insertion length 40mm

Compatible Cables

The F-835 Autoclavable pH Electrode uses a standard S8 detachable cable connection. We recommend the following cables for use with it:

Cable Type	Sensor Connector & Device Connector	Device Terminal
HP Plug to BNC Plug, Type A
HP Plug to BNC Plug, Type M
HP Plug to DIN Plug, Type M
HP Plug to Crimped Ferrules, Type M
HP Plug to Ferrules, Solution Ground, Type N