All-in-One pH/ORP (REDOX) Sensor FU20/FU24/PH20

The PH20, FU20 and FU24 all-in-one sensors show how Yokogawa applies the motto "Simple is best" to sensor technology. These sensors feature four separate elements (pH, reference, temperature, ORP) allowing for simultaneous measurement of pH and ORP is possible with one sensor in a rugged Ryton or PVDF (FU20), Ryton (FU24) or PVDF (PH20). The integral or vario-pin cable comes number-coded cable along with the integral NPT threads on the sensor makes installation convenient. The Quick Release Adapters for the FU20 allow easy removal of the sensor for cleaning and calibration.  body

Which sensor is right for you?

There are now FIVE different wide body sensor designs available to choose from. 

Please use the charts below to help guide in you in the proper selection of which version is best for your application.

• Avaiable as analog and digital SMART sensors (SENCOM)

• Solid Platinum ORP/LE electrode for accurate simultaneous pH and ORP measurements.

• Integral Pt1000 element for accurate temperature measurements and enhanced pH accuracy

• Double junction and long diffusional path for reference pollution/poisoning resistance

• Saturated Ag/AgCl reference system with double junction combined with polymerized saturated KCl and ion-trap prolong the life of the reference probe even in chemically unfavorable environments.

• Extended life time by large volume of polymerized electrolyte and porous PTFE diaphragm

• Cation Differentail reference system avaiable in the FU20 foor enlongated life

• Variopin connector or integrated cable options

• Simple maintenance by comprehensive design

• Versatile Direct in-line, immersion, off-line installation (flow fitting) and retractable Hot-tap (avaibale with use of the FU20 only)

• Quick-Release adapter available for the FU20

• Calibration certificate delivered with each sensor

• Patented pressure compensation in the PH20 and FU24

• Available in two versions, a robust dome shape model for applications with a limited amount of solids, and a flat surface model for applications in which solids are a considerable component

The FU20 combination sensor shows how Yokogawa applies the motto "Simply the best" to sensor technology. The wide body sensors (26 mm diameter) hold four separate elements in one unbreakable PPS40GF (RytonTM) or PVDF body. Installation is simple with the integrated industrial 3/4" tapered thread. The large volume gelled electrolyte and the double junction reference system slows down depletion and poisoning therefore extending the lifetime. The system is targeted at those applications where simplicity will result in accurate and reliable pH- or redox measurements. This means that in 90% of the know applications this sensor will be an excellent choice.

The FU24 is an all-on-one pH and ORP sensor made with a chemical resistant PPS 40GF body for harsh pH applications.  It is particularly useful in applications with fluctuating pressure and/or temperature. These processes shorten sensor life because the process fluids move in and out of the sensor under influence of frequent pressure and/or temperature fluctuations. This results in fast desalting and dilution of the reference electrolyte which in turn changes the reference voltage causing a drifting pH measurement.

By integrating the successful Yokogawa patented Bellow design concept within the FU24 electrode, a strong pressure compensation mechanism is created. The built-in bellow ensures immediate interior pressure equalization to the outside pressure, making the sensor virtually insensitive to external pressure variations. A slight overpressure caused by the bellow tension, prevents fluid ingress and maintains a positive ion flow out of the sensor.

The PH20 is nicknamed "Tempress" because of the patented compensation for changes in the process temperature and pressure. This simple mechanical feature makes the sensor more accurate, and gives it a longer lifetime. The compensation panels flex to accommodate changes in the avoiding large differential pressures across the diaphragm. This prevents most problems associated with the reference junction. The PH20 is made in chemically resistant PVDF. The reference system is Silver/Silver Chloride, with a double junction and a gelled electrolyte to combat pollution. The Platinum Redox electrode doubles as a solution ground, essential for uncompromising accuracy, and for sensor diagnostic measurements.

WU10 Cable

The WU10 interconnection cable is specified for reliable transfer of analog signals between Variopin sensors and analyzer. It is especially designed to be installed in a heavy industrial environment. The cable has a wide temperature operation range which is sufficient for most of the applications. The materials used for the cable are flame retardant to resist the spread of fire.