Universal Differential pH Water Quality Sensors

Sensorex SD7500 works with any existing conventional pH transmitter
Garden Grove, California (June 29, 2017) – Routine sensor replacement is a necessary maintenance step in continuous online pH monitoring. The Sensorex SD7500 Universal Differential pH Probe extends the working lifetime of sensors, reducing maintenance frequency, without compromising accuracy and reliability. Universal compatibility with virtually any brand of conventional pH transmitter enables easy upgrade of existing sensors for industrial and municipal wastewater treatment and neutralization; metal finishing and plating; wet fume scrubbers; chemical processing; and other online water quality and process applications.

Universal pH replacement sensor

The SD7500,a universal differential pH replacement probe, is accurate and reliable, with extended sensor life.

The SD7500 probe measures process pH differentially with three electrode sensors: a process pH electrode, a pH reference (actually a second measuring pH electrode in a known pH 7.0 buffered cell solution protected by a replaceable salt bridge reference junction), and a titanium ground electrode. The result is a highly accurate differential pH measurement that is virtually unaffected by ground loop measurement errors.

The three electrode design, coupled with durable Ryton® Polyphenylene Sulfide (PPS) body construction, resists process contamination. The double junction construction of the replaceable salt bridge further guards against fouling, even in highly aggressive chemical environments. Automatic temperature compensation with an accurate Pt1000 RTD ensures pH measurement accuracy over a wide temperature range.

Differential pH sensors are designed so the double junction salt bridge and the buffered reference cell solution can be replaced in the field by on-site operators, at a much lower cost than total sensor replacement. Compared to conventional combination sensors, differential pH sensors provide measurements of greater stability, over longer periods of time, with less downtime and maintenance. Typical sensor service lifetime ranges from 3 to 5 years.

With a self-powered preamp and combination sensor output, the SD7500 Differential pH Probe can be used with most conventional online pH/ORP transmitters and controllers. This enables drop-in replacement in existing process installations, as well as easy integration into new systems. Manufactured in the USA, Sensorex’s SD7500 probe is backed by a two-year limited warranty.

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Sensorex Appoints New President

Aseem Sharma takes helm at water measurement specialist
Garden Grove, California (May 31, 2017) – Aseem Sharma has been appointed President of Sensorex, a leading designer and manufacturer of sensors and instrumentation for real-time water analysis.


Aseem Sharma, President of Sensorex

In his new role, Sharma will be responsible for strategic management of Sensorex’s global operations. The company’s electrochemical and optical sensors measure pH, ORP, UV transmittance, dissolved oxygen, free chlorine, chlorine dioxide and other specialty elements. Its sensors, instrumentation, and accessories are used in a wide range of OEM, industrial and municipal water, laboratory, agricultural, and manufacturing applications.

Sharma brings extensive global management experience in a variety of industries to his role at Sensorex. Most recently, he was Vice President of Strategic Partnership for Amryris, Inc., a renewable chemicals company. Prior to that, he was with Owens Corning, as General Manager of its North American Building and Composite Materials business.

Sharma developed his international experience during his tenure with Corning, Inc., where he moved from Director of Strategy Planning and Business Development to President of Corning South Asia in New Delhi, India. His career started in the water businesses of ABB and W.R. Grace (now GE Water), bringing him full circle as he returns to the water industry at Sensorex. Sharma earned an MBA from Lehigh University, and a Chemical Engineering degree from the Indian Institute of Technology.

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Truly Portable Handheld UV Transmittance Monitor from Sensorex

UVT-LED-H efficiently and accurately measures UV transmittance
Garden Grove, California (April 18, 2017) – The UVT-LED-H handheld UV transmittance monitor delivers fast and accurate UV transmittance readings in any applications employing UV disinfection. Its compact size and ease-of-use are equally well-suited to field measurements, lab use, and calibration verification of online UVT analyzers. An LED light source significantly reduces maintenance burden and environmental impact, with an extended service life.

Sensorex UVT-LED-H

Handheld UV Transmittance measurements in the lab and field.

The UVT-LED-H is the only currently available portable UV-transmittance monitor that is handheld. The ergonomic unit is simple to operate with a single push button, and the instant measurements can be read clearly on the backlit LED display. The UVT-LED-H verifies UV dosing and efficient operation of UV disinfection systems in municipal drinking water, wastewater, and other industrial water quality applications, such as food and beverage process water, as well as in quality testing labs associated with those applications.

The instrument’s highly efficient UV-C LED lamps are more stable, improving accuracy when compared to instruments with traditional mercury light sources. Additional benefits include zero warm up time and low battery consumption, taking up to 350 readings on a single charge.

The mercury-free UV-C LED light source extends sensor lifetime up to 5 times, compared to monitors using mercury lamps. It also significantly lowers operating expenses related to UVT monitoring by eliminating field serviceable parts and disposal of lamps containing environmentally harmful mercury.

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Pool and Spa Sensors for Water Quality Monitoring

Ready pools, spas and aquatic attractions for the summer season with Sensorex pH/ORP probes
Garden Grove, California (March 22, 2017) – As the weather warms and pool equipment is being readied for the new season, replacement of pH and ORP sensors is a crucial part of the maintenance process. Monitoring water quality with Sensorex’s cost-effective pH and ORP sensors impedes algae growth, reduces surface erosion and increases swimmer enjoyment.

pH and ORP Probes

The Sensorex S465 Series are a direct replacement alternative to Acu-Trol® pH and S420 Series replace Strantrol® pH and ORP probes.

The Sensorex S465 Series are a direct replacement alternative to Acu-Trol® pH and ORP probes, and the robust S420 Series replace Strantrol® pH and ORP probes. In addition to a reasonable price point, both Series are easy to integrate into existing systems and offer long, reliable service life. Sensorex’s advanced sensor technology delivers accurate measurement over a range of 0-14 pH or +/-1000 mV for ORP. Sensors use a higher volume of Sensorex’s proprietary polymer sensor reference gel for longer service life.

Proper disinfection of aquatic environments is a delicate balancing act. Over-chlorinate and cause bather discomfort and equipment erosion; under-chlorinate and increase the risk of illness, odor and discolored water. But identifying correct chlorination levels is difficult to determine. Water quality can fluctuate quickly based on the number of swimmers and the sweat, dirt, oils, and sunscreen they introduce into the water, as well as the level of biological contaminants like insects and leaves. Even temperature plays a role, as some bacteria thrive at temperatures above 80-90°F.

In addition to continuously monitoring pH levels, measurement of Oxidation Reduction Potential (ORP), is one the most reliable and efficient ways to ensure the effectiveness of a sanitizer, such as chlorine, in pools and spas. ORP levels indicate effective chlorination concentration for killing off bacteria and preventing organism growth.

Both the S465 Series and S420 Sensor Series employ a ½” NPT connection for easy in line installation or use with existing Acu-Trol® or Strantrol® flow cells, without modification. The S465pH and ORP models are supplied with a BNR connector for quick connection to an aquatic controller, while the S420 models are available with the option of 30 inch or 10 foot cable lengths for easy integration into existing systems. Advanced signal shielding reduces noise for more accurate communication with process control systems.

Sensorex offers a full overview of Swimming Pool Chemistry and Monitoring at www.sensorex.com/pool-chemistry/, as well as a quick cross reference guide (www.sensorex.com/docs/brochures/Pool-Spa-Replacement-Guide.pdf) to find the right retrofit sensor.

*Acu-Trol is a registered trademark of Pentair. No affiliation, endorsement or sponsorship is stated or implied.
*Strantrol is a registered trademark of Evoqua Water Technologies. No affiliation, endorsement or sponsorship is stated or implied

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Sensorex Water Sensors Chosen for Innovative Smart Village Concept

Dissolved Oxygen and pH probes monitor key water parameters for aquaculture industry in Indian village of Mori
Garden Grove, California (January 18, 2016) – Sensorex dissolved oxygen and pH sensors are being used to monitor shrimp farms in Mori Village, a pioneering “Smart Village” in India. Three sets of Sensorex DO6441 dissolved oxygen (DO) and S8000 modular pH sensors have been deployed to measure water quality and key aquaculture parameters to increase the yield and efficiency of shrimp farming in the village.

Sensorex DO sensor, pH sensor

Sensorex dissolved oxygen and pH sensors are deployed in a shrimp cultivation pond in Mori Village, India. The aquaculture monitoring system is part of a pioneering “Smart Village” concept.

The Smart Village project is a collaboration of the Garwood Center for Corporate Innovation, Haas School of Business, University of California, Berkeley and the Andrah Pradesh Government of India. The project seeks to extend the concept of connected “Smart Cities” to rural villages, where more than half of the world’s population reside. Mori Village is the first prototype of the concept. Its objective is to empower the residents in the village, by providing access to the tools and technology to carry on their entrepreneurial activities.

Shrimp farming is one of the five top industries that make up the economic base in the village of 8000 residents, which is located in the East Godavari District of Andhra Pradesh. It has the potential for high margin returns but can be also be high risk due to preventable disease. Traditionally, manual samples of the water were taken and sent to a lab, a labor intensive and time consuming process. The delay between taking a reading and waiting for the results meant critical time was lost in addressing any imbalances.

Once shrimp farming variability was identified as a pain point by the villagers, interested tech firms were brought in to co-innovate with the villagers to develop tech solutions. Participating corporate partners include Google, IBM, and NASA. Sensorex partnered with Appscape, Inc., who developed a cloud based monitoring and control system to be used with the Sensorex probes.

One set of DO and pH sensors is deployed in three separate shrimp ponds, taking water quality readings critical to maintaining the health of the livestock. The probes are equipped with Sensorex’s 4-20mA output modules, which feed into a PLC running AppScape’s app. The app is accessed from a mobile device and displays real-time readings of pH and DO. The app enables control of the pond’s aerators, which can be operated remotely via the app. Additional app features include data logging, trend analysis, and export for reporting and records backup.

Beyond the oxygen needed by the shrimp population to survive, grow and reproduce, dissolved oxygen is essential to the aerobic decomposition of organic solids that ensures a healthy habitat. This is especially important in aquafarming applications, where the high population density can adversely impact this natural process. By monitoring with Sensorex’s DO6441, farmers immediately know if an unhealthy environment is developing. When values fall below the optimal range of 2.5-3.5 ppm, the ponds’ aerators can be turned on to bring more oxygen into the water. Once the correct DO level is reached, the aerators can be turned off, lowering energy consumption and overall operating costs.

Like dissolved oxygen levels, pH levels can significantly impact the health of aquaculture livestock. Extremes in pH can lead to fish kills. With monitoring, pH altering variables like acid rain and agricultural run-off can be remediated with buffers and chemicals to restore pH balance.

Sensorex DO and pH sensors provide reliable, accurate measurement over a range of 0-20ppm dissolved oxygen and 0-14 pH. Constructed with durable, fully submersible bodies, the probes’ flat measurement surfaces stay clean, ensuring accurate readings with low maintenance and long service life. A range of options are available to customize sensors to application needs.

The Smart Village prototyping phase wrapped up in December, 2016, with an inaugural event to present the new technology to Andhra Pradesh’s Chief Minister. The Sensorex sensors are deployed and monitoring their first crop of shrimp, with harvest expected in 4-6 months. The prototype Smart Village concept could potentially be applied to 650,000 Indian villages and eventually around the world. Sensorex monitoring solutions can be applied to a range of aquaculture and industrial processes to improve the quality of life in rural communities.

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Sensorex Launches New Laboratory pH Sensor Family for Every Application

Basic, Advanced and Research-Grade sensors available with a range of customized options
Garden Grove, California (October 27, 2016) – Sensorex’s new line of laboratory pH sensors offer a range of options to maximize measurement accuracy and sensor lifetime. The Basic, Advanced, and Research-Grade pH sensors allow end users to choose just what fits their application needs–eliminating overspending on overly sophisticated sensors, or on frequent sensor replacement in challenging environments. All Sensorex pH sensors offer accurate and reliable measurements across full pH ranges (0-14), compatible with all pH meters accepting a BNC connector.

Sensorex pHSensors

Sensorex’s new laboratory pH sensor family suits every application.

Sensorex’s Basic pH1000 sensor is durable and easy to use, ideal for swimming pool, aquarium, or hydroponics measurement, as well as science class experiments. Designed to withstand regular wear and tear, with a durable polycarbonate body and built-in protection for the pH glass measuring surface, the pH1000 provides reliable, stable readings in temperatures of up to 60°C.

The Advanced family is more versatile for more difficult sample types in environmental, wastewater and food production applications. The standard and specialty Advanced models offer extended sensor life and measurement accuracy in temperatures of up to 80°C. The sensors feature chemically-resistant Ultem® bodies, double junction references, and booted meter connections for durability. This family includes the pH2000 extended life laboratory sensor for unpredictable samples prone to contaminants. The pH2100 flat tip electrode is ideal for viscous samples, slurries, and soft surfaces such as agar plates and skin. The family’s pH2200 spear tip sensor is specially designed to pierce semi-solids like food and soil.

The pH3000 Research-Grade sensor is Sensorex’s most sensitive lab electrode, best for low ionic samples, including drinking water, biomedical and pharmaceutical applications. It is specially designed to respond quickly and accurately to rapid temperature changes, up to 100°C, with accuracy down to 0.04 pH.

To help users choose the best sensor for their applications, Sensorex has launched an interactive sensor selection tool.

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Sensorex Expands UV Transmittance Offerings with Submersible Sensor

UVT-LED-SW delivers efficient, accurate UV transmittance monitoring for municipal wastewater applications
Garden Grove, California (September 8, 2016) – The UVT-LED-SW UV Transmittance Sensor provides continuous monitoring for accurate UV disinfection dosing. The probe delivers fast, accurate, UV transmittance readings in open channel wastewater treatment applications where UV disinfection is used. With proper dosing adjustment based on UVT values, fluctuations in organic content can be accounted for and UV disinfection energy efficiency is increased.

Sensorex UVT-LED-SW

The UVT-LED-SW Transmittance delivers fast, accurate, UV transmittance readings

The UVT-LED-SW is mounted directly to the wall of any open channel system, taking automatic measurements every 60 seconds. The sensor directly outputs a 4-20mA signal, integrating into a variety of process monitoring systems without a transmitter or controller.

Patented cleaning and calibration features ensure UVT-LED-SW measurements are accurate and reliable. The integrated Teflon wiper delivers a swift cleaning cycle before each reading is taken, preventing fouling and build-up. At the same time, the sensor self-calibrates to an integrated quartz reference standard.

The unit’s highly efficient UV-C LED lamps provide up to five times longer life than comparable mercury lamps, eliminating field-serviceable parts. All of these features reduce maintenance and significantly lower operating expenses related to UVT monitoring and UV disinfection. No costly service and maintenance contracts are required; all maintenance can be performed onsite.

Sensorex offers several installation kits, including mounting hardware for new installations and retrofits of Hach UVAS models. The UVT-LED-SW is also compatible with Hach SC200 controllers for retrofit installation.

The submersible UVT sensor is the third product in the Sensorex UVT-LED family. It joins the UVT-LED-PW, an in-line UVT monitor that can be mounted directly in a pressurized pipe or sampling line, and the UVT-LED-H, a lightweight, battery operated, handheld UVT monitor ideal for sample measurements in the field, as well as periodic verification of calibration of online UVT analyzers.

Sensorex will be exhibiting the UVT-LED-SW at WEFTEC 2016, booth #3601.

*Hach is a registered trademark of the Hach Company. No affiliation, endorsement or sponsorship is stated or implied.


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Sensorex Expands SD7000 Differential pH/ORP Sensor Line

New models compatible with a wider range of process monitoring systems for water, wastewater, environmental scrubber and other challenging applications
Garden Grove, California (August 12, 2016) – Sensorex has expanded its SD7000 family of Differential pH/ORP Sensors, adding four new models to suit a wider range of online process monitoring applications. Sensorex’s proven differential sensor technology produces highly accurate measurements with an overall low cost of ownership. They are ideally suited for measuring pH and ORP in industrial and municipal wastewater treatment and neutralization; metal finishing and plating; wet fume scrubbers; chemical processing; and other online water quality and process applications.

Sensorex Differential pH/ORP

Sensorex expands SD7000 Differential pH/ORP Sensor line.

The three electrode differential sensor design results in less maintenance for operators, minimized down time, longer sensor life and overall greater reliability. Process pH or ORP is measured differentially with process and protected inner reference electrodes, compared to a third ground electrode. The inner reference electrode is surrounded by a known concentrated pH 7 buffer that resists process contamination, maintaining its pH level with minimal dilution effects. A double junction salt bridge further guards against contamination. Both the standard pH 7 cell solution and salt bridge can be replaced periodically at a much lower cost than total sensor replacement.

The new SD7500CD and SD7500CD-ORP are universally compatible with any conventional pH/ORP transmitter or controller, including Sensorex products. The new SD7420CD and SD7420CD-ORP include a direct 4-20mA output for integration into process control systems without requiring an additional 4-20mA transmitter or controller. These sensors are also a direct replacement option for some Hach® and Water Analytics®/Aquametrix probes, as follows:


  • Hach 6428P0 (LCP body)
  • Hach 6422P0 (Ryton body)
  • Water Analytics P65C-8 pH (CPVC Body)


  • Hach 2428R0 (LCP body)
  • Hach 2422R0 (Ryton body)
  • Water Analytics R65C-8 (CPVC body)

*Hach is a registered trademark of the Hach Company. Aquametrix is a product of Water Analytics Inc. No affiliation, endorsement or sponsorship is stated or implied.

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Economical Online Process Meters from Sensorex Measure pH, ORP, or Conductivity

TX- and CX- models direct fit alternatives for discontinued Eutech Instruments equipment
Garden Grove, California (July 6, 2016) – Sensorex has expanded its family of water quality and online process transmitters, adding four new models to provide basic monitoring and control. The TX10 pH/ORP and CX10 Conductivity and transmitters offer simple monitoring, while the TX20 pH/ORP and CX20 Conductivity controllers can also be programmed for process control. These small-footprint panel-mount transmitters provide reliable data and control of process fluids, in a cost-effective package. Applications include water quality, chemical, electronics, food production, environmental and wastewater treatment.

Sensorex TX10, CX10, TX10, TX20

Sensorex pH, ORP, or Conductivity online process meters are direct fit alternatives for discontinued Eutech Instruments equipment.

The TX10 measures pH or ORP and temperature. The CX10 transmitter measures conductivity, resistivity, and temperature. Both provide convenient local display of values and easy access to calibrate online process sensors. The primary measurement 4-20mA signal output can be integrated into a range of process control systems.

The TX20 monitors pH or ORP, with temperature compensation for accurate measurement and control. The CX20 monitors conductivity or resistivity, also with temperature compensation. Both provide local display of values with relay output for alarm or control of process conditions ideal for use with chemical feed systems.

All four models are simple to operate, with push button interface and clear LCD displays. They are designed to save panel space with a small footprint 1/8 DIN enclosure. The devices are 100-240 VAC line-powered.

The Sensorex instruments provide direct replacement for discontinued Eutech Instruments* products as follows:

  • Sensorex TX10 replaces Eutech Instruments pH 190
  • Sensorex CX10 replaces Eutech Instruments Cond 190
  • Sensorex TX20 replaces Eutech Instruments pH 200
  • Sensorex CX20 replaces Eutech Instruments Cond 200

*Eutech Instruments is part of Thermo Fisher Scientific Inc. No affiliation, endorsement or sponsorship is stated or implied.

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Sensorex Online Process UV Transmittance Monitor Self-Calibrates

UVT-LED-PW delivers efficient, accurate transmittance measurement with minimal maintenance

Garden Grove, California (April 27, 2016) – The UVT-LED-PW Transmittance Monitor (formerly PearlSense T254) provides continuous monitoring for accurate UV disinfection dosing. The compact monitor delivers fast, accurate, in-line transmittance readings in industrial process and drinking water settings, where UV disinfection is used. Patented automatic wiping and calibration mechanisms significantly reduce maintenance burden and extend service life. UV Transmittance measurement with the UVT-LED-PW ensures proper UV dosing and efficient operation of UV disinfection systems. Simple to operate, with a clear backlit LED display, the UVT-LED-PW is mounted directly in a pressurized pipe or sampling line, taking automatic measurements every 60 seconds. The sensor directly outputs a 4-20mA signal for UV system control or data logging.

Sensorex UVT-LED

Sensorex UVT-LED-PW delivers efficient, accurate transmittance measurement with minimal maintenance.

Patented cleaning and calibration features ensure UVT-LED-PW measurements are accurate and reliable. The integrated Teflon wiper delivers a swift cleaning cycle before each reading is taken, to prevent fouling and build-up in water and wastewater applications. The sensor automatically calibrates to a quartz reference standard built into the wiper mechanism. These integrated features, along with highly efficient UV-C LED lamps, reduce maintenance and significantly lower operating expenses related to UVT monitoring and UV disinfection.

The UVT-LED-PW has the smallest footprint of any commercially available UV-transmittance sensor for easy integration in new or existing UV disinfection systems. The UV-C LED light source is more stable than traditional measurement sources, leading to improved accuracy. The IP66-rated unit runs on 24V DC power.

Sensorex also offers the UVT-LED-H Handheld UV Transmittance Monitor. The lightweight, battery operated monitor is ideal for sample measurements in the field, as well as periodic verification of calibration of online UVT analyzers.

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