F-695 Autoclavable pH Electrode

Name: F-695 Autoclavable pH Sensor with K9 Connector
SKU: F-695
Availability: InStock

The F-695 is similar to the F-635 and varies only in the connector type. Suitable for either benchtop or production vessels. Steam sterilizable and autoclavable.

Steam sterilized in-situ in steel bioreactors and fermentation tanks with 25 mm entry ports.

Autoclaved with bellows assemblies for aseptic insertion into single-use bioprocess containers (BPCs).

Autoclaved with benchtop vessels. Sensor lengths available for vessel sizes from 1 liter to 20 liters.

The metric FermProbe is now available with a different cap style, the “K9”. Together with the traditional connector, this K9 connector cap expands the Broadley-James’ offering to make it completely compatible with any existing system, regardless of the installed cable type. The F-685’s K9 cap eliminates the need for cable adapters. It also has fewer crevices to retain moisture and therefore can be autoclaved without using the autoclave cap.

Metric FermProbe Autoclavable pH Sensor

This FermProbe 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 sterilizable, tthe Model F-695 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 (see accessories tab for recommended cables).

Features of the F-695

Metric threaded cap is compatible with nearly all European designed bioprocess electrode housings.
Steam sterilizable and autoclavable.
First choice for use with small autoclavable vessels.
Available in variety of lengths for different insertion length requirements and applications.

Sensor Specifications

Measurement Range	0–14 pH
Operational Temp. Range	-5°–135° C [23°–275° F]
Operational Pressure Range	0-7750 mmHg [0-150 psig]
Storage Temperature	5°–50° C [41°–122° F]
Shelf Life	12 months
Sensor Connector	K9, Coaxially Shielded
Sensor Connector Cable	AX-1000-KP-XXXX series

Wetted Materials

O-ring	FDA Compliant Silicone
pH Glass Electrode	Lead-free Glass
Ceramic Junction	Alumina Silicate

Sensor Housings

The F-695 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-695 FermProbe^{^{^®}} autoclavable pH electrode:

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

This FermProbe^{^{^®}} style features a K9 detachable cable connection. We would recommend the following cables for use with the F-695 Autoclavable pH Electrode:

Cable Type	Sensor Connector & Device Connector	Device Terminal
KP plug to BNC, Type M
KP plug to DIN, Type M
KP plug to Ferrules, Solution Ground, Type N

Choose Electrode Model

If the electrode needs to fit an existing cable, check cable connector. If it has a female connection, an F-695 or F-895 FermProbe is required. Another guideline is to note the connector’s color. If the cable connector is red or orange, use the F-695 or F-895 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 an electrode 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-695 pH electrodes require disconnect cable and connector assemblies (see Accessories tab for recommended cables).

Ordering Information

Model F-695 pH FermProbe with Standard Metric Cap

Electrode Model	Use with these Housing Models	Electrode Length	Cable Length	Connector	Electrode Part Number
F-695	325, 335 Class D<1L Vessel	120 mm	Order Separately		F-695-B120-DK
F-695	325, 335 Class F1-3L Vessel	200 mm			F-695-B200-DK
F-695	3L-5L Vessel	225 mm			F-695-B225-DK
F-695	7L-15L Vessel	325 mm			F-695-B325-DK
F-695	15L-20L Vessel	420 mm			F-695-B420-DK
F-695	Many other lengths available, contact for information.	XXX mm			F-695-B480-DK

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

FAQs

How Should FermProbes Be Stored?

Never store a pH electrode dry. The first choice for storing FermProbes is KCl solution. We recommend any concentration between 2.0 M and 3.8 M. Another good choice is buffer solution. A pH 4 buffer solution is best since it will keep longer, but pH 7 is also acceptable. If it is necessary to clean a FermProbe with acid, caustic, solvent or other cleaning solution, it is best to soak the electrode in KCl solution after cleaning and prior to use or calibration. This will re-condition the bulb and reference, extending the probe life and improving calibration accuracy.

What's inside a FermProbe?

The gel in a FermProbe^® is a non-toxic, USP grade, organic material. Other manufacturers may use different materials such as polyacrylamide. Please call us for more information or an MSDS.

What is a pH Electrode Life Expectancy?

How long should an electrode last in storage?

Fermprobes can be stored for up to one year from date of shipment with no appreciable change in their performance or expected service life. After a year, the electrodes are still good but their potential for optimum performance slowly erodes until they finally become totally non-functional. This would usually take many years of storage. Most customers try to rotate stock so electrodes are put into service prior to one year from shipment, and this would be our strong recommendation for most customers.

How long should an electrode last in actual service?

Fermprobe pH electrodes exhibit a fairly predictable "lifetime vs. temperature" performance ratio. The higher the temperature, the shorter the life; and, the longer the duration of exposure to elevated temperature, the shorter the life. Maximum temperature advisable is 135°C.

For example:

A Fermprobe may last 40 sterilization cycles at 121°C for 30minutes. (20 hours at 121°C)
A Fermprobe may last 20 sterilization cycles at 121°C for 60minutes. (20 hours at 121°C)
A Fermprobe may last 20 sterilization cycles at 135°C for 30minutes. (10 hours at 135°C)
A Fermprobe may last 10 sterilization cycles at 135°C for 60minutes. (10 hours at 135°C)

The actual service life attained will depend upon all other considerations, such as whether or not there is a CIP cycle (strong, hot caustics can dissolve the glass and the ceramic), whether or not the sensor is exposed to high pressure or fast flow rates, whether or not there are abrasives in the sample, etc.. Since there are so many variables and factors involved in determining electrode life, an operator can best determine the life for his particular vessel and set of conditions experimentally. By careful recording of when the electrodes are installed and a statistical analysis of typical life, one can determine the optimum number of cycles.

There is a normal variance in electrode life and most operators of production vessels will search out a number, perhaps 10 cycles, that gives them a maximum confidence in the ability to run a cycle without failure. It is a helpful exercise to take the cost of the electrode and divide it by the number of cycles, then look at this "cost per cycle" to see if it is justifiable for a particular product.

F-695 Autoclavable pH Electrode

Ordering Information

Metric FermProbe Autoclavable pH Sensor

Features of the F-695

Sensor Specifications

Wetted Materials

Sensor Housings

Compatible Cables

Choose Electrode Model