Advanced pH sensor technology from Foxboro
June 2018, Sensors & Transducers

Foxboro has been manufacturing pH probes and transmitters for over seventy years. Using this field-proven experience, the company has now developed the Dolphin series of pH sensors.

Due to the advances in manufacturing techniques and the discovery of new materials, today’s pH sensor technology looks and operates differently. In pH probes of the past, the reference junction had to be kept wet at all times. In the latest Foxboro pH sensor technology incorporated in the Dolphin series, the entirely solid-state reference junction is manufactured from Nafion and Ceramic, which eliminates the need for wetted parts.

1. Double junction reference tube using a Nafion Barrier. 2. High temperature gel. 3. RTD and solution assembly. 4. Ceramic reference junction. 5. Unique spherical or flat glass pH electrodes.

The probes body is manufactured from PVDF (polyvinylidene fluoride, commercially known as Kynar), which incorporates the microprocessor-based smart electronics where all the sensor data and calibration curves are recorded and stored. The probe also has features built-in, temperature compensation and the digital signals from sensor to transmitter are less prone to RFI/EMI interference than conventional analog signals.

An added benefit of the Dolphin series is that users can connect the probes directly to a PC or laptop for ease of use. Via FDT and DTM certified software, the probes can be calibrated in the workshop prior to installation. In addition, information can also be extracted from the probe for maintenance and diagnostic purposes.

In summary, the advantages of the Dolphin series pH probes include:

• Unique Nafion ion barrier prevents reference junction fouling and reduces the need for cleaning.

• Rugged PVDF sensor body is chemical and abrasion resistant, resulting in longer service life.

• No metallic wetted parts, results in corrosion resistance and longer life in strong chemical solutions.

• Unique pH electrode formulations, both flat glass for abrasion resistance and domed glass for high-temperature service.

• Enhanced diagnostics reduce the amount of time required to assess sensor health.

• Unique sensor mounting design provides faster insertion and removal from the process.

• Kyner sensor body and a rugged electrode result in reduced breakage during handling.

For more information contact Johan van Jaarsveldt, EOH, +27 (0)87 803 9783, johan.vanjaarsveldt@eoh-pas.co.za, www.eoh-pas.co.za

Further reading:

• Booyco leads the pack
  June 2018, Booyco Electronics, Sensors & Transducers
  As South Africa’s leader in terms of the largest deployment of proximity detection systems (PDS) in the mining sector, Booyco Electronics has celebrated another massive landmark, its 5000th PDS installation. ...
  
• Robust full-metal sensors for diverse applications
  June 2018, Sensors & Transducers
  Autonics has released the new PRF series full-metal inductive proximity sensors with stainless steel housing and sensor heads. The robust sensors are highly resistant to deformation and corrosion and ...
  
• USB configurable infrared temperature sensors
  June 2018, ASSTech Process Electronics + Instrumentation, Sensors & Transducers
  ASSTech markets the British-made Calex range of pyrometers and now offers the new USB configurable infrared temperature sensors with 4-20 mA output. Temperatures are measured accurately and consistently ...
  
• Sensor solution for high-end vehicle market
  June 2018, SICK Automation Southern Africa, Sensors & Transducers
  SICK Automation Southern Africa (SICK) was contracted by Mahle, a manufacturer of vehicle heat exchangers, to install an imaged based sensor solution in its KwaZulu-Natal manufacturing facility. Mahle ...
  
• Muting reinvented
  June 2018, Countapulse Controls, Sensors & Transducers
  Smart Process Gating, introduced by Leuze, has made muting processes more economical as well as simpler and safer. This technology is available in southern Africa from sensor solutions specialist, Countapulse ...
  
• Improved protection against under- and over-pressurisation of safety devices
  June 2018, Yokogawa South Africa, Sensors & Transducers
  Recommended good practice for subsea production systems require sensors to be installed that measure pressure safety high (PSH), to provide over-pressure protection on downstream vessels in a production ...
  
• Ultrasonic sensor for remote level measurement
  May 2018, Instrotech, Sensors & Transducers
  Instrotech has available the Senix ToughSonic Chem range of ultrasonic sensors, in service around the world in some of the most demanding and corrosive industrial environments. They measure a wide variety ...
  
• Telco sensors for break detection
  May 2018, Gail Norton Instrumentation, Sensors & Transducers
  Some of the toughest challenges for sensors are found in the pulp and paper industry. Here, high temperatures and a contaminated environment make it difficult for optical sensors to operate accurately ...
  
• Enhanced pressure vessel level measurement
  May 2018, EOH Process Automation Solutions, Level Measurement & Control
  The traditional approach to level measurement in a pressurised vessel, such as a boiler, has been to use a conventional differential pressure (DP) transmitter with external water-filled ‘wet’ legs connecting ...
  
• All-in-one track and trace packaging solution
  May 2018, SICK Automation Southern Africa, Sensors & Transducers
  SICK Automation upgrades The RTT Group’s DWS systems.
  
• Speed sensors ATEX approved with IO-Link
  May 2018, ifm Electronic RSA, Sensors & Transducers
  The new range of speed sensors from ifm electronic has the evaluation electronics integrated into the sensor housing. This allows for low cost and easy monitoring of rotating as well as linear movements ...
  
• Cylindrical sensors offer strength
  May 2018, Countapulse Controls, Sensors & Transducers
  Countapulse Controls reports that the Leuze cylindrical sensors offer a higher mechanical strength than standard sensors. Engineered for particularly arduous conditions, the Leuze 328 series sensor is ...