F-285 Sterilisable pH Probe

The Model F285 FermProbe^® sterilisable pH probe is a sealed, gel-filled, design with a built-in temperature element that can be autoclaved or Steam In Place (SIP). The temperature element enables automatic compensation of Nernstian temperature effects in processes with wide pH ranges and significant temperature shifts.

The VarioPin connector allows for a multiple connection; both pH signal and temperature signal in the same wiring harness. The temperature element is either a PT100 or PT1000 Platinum Resistance Device, which are compatible with the majority of commercially available instruments. The unique construction methods used by Broadley-James allows this sterilisable pH probe to operate at pressures of up to 10bar (150psig) and temperatures up to 135°C.

Features

• Integrated RTD temperature element for temperature compensation.
• 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.

Choose Electrode Model

If the electrode needs to fit an existing cable, check cable connector. If it has a multipin connector, an F-235 or F-285 FermProbe is required. Another guideline is to note the connector’s colour. If the cable connector is all stainless steel, use the F-235 or F-285 FermProbe.  The F-235 and F-285 sensors also have an integrated temperature sensor that can be used for automatic temperature compensation.

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 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-285 pH electrodes require disconnect cable and connector assemblies (see Accessories tab for information about compatible cables).

Ordering Information

Model F-285 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

We would recommend the following Broadley-James sensor housings for use with the F-285 FermProbe^® sterilisable pH probe:

• Model 335 Sensor Unguarded Housing – Standard 25mm (Pg 13.5), typical vessel insertion lengths 52mm & 128mm
• Model 325 Sensor Guarded 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

This multifunctional electrode is capable of both receiving and processing a number of signals at the same time. The Variopin (VP) connector allows simultaneous pH and temperature readings. We recommend the following cables for use with the F-285 FermProbe^® sterilisable pH probe:

Cable Type	Sensor Connector & Device Connector	Device Terminal
VP plug to Ferrules