Online Sensors

In heavily contaminated wastewater or chemical processing applications, an inline pH probe typically wears out fast. Constantly replacing an inline pH probe can feel like a waste of time and money. We created our modular, quick disconnect S8000 sensor packages for these types of heavy duty industrial applications. The sensor can be replaced in a few seconds with no tools or re-wiring required by swapping the S8000CD Quick Change Replacement Cartridge. Reuse the cable assembly and other mounting hardware for a low cost of ownership.

• Recommended for challenging water and wastewater applications
• Fast sensor changes with no tools required
• Reusable cable and mounting hardware
• Low total cost of ownership
• One year limited warranty

Optional Accessories:

• Differential amplifier module for applications with ground loop issues
• Unity gain amplifier module transmits sensor signal up to 1000ft
• 4-20mA transmitter module to connect to a PLC, SCADA or controller with 4-20mA input card

Continuous online pH monitoring in wastewater and coating industrial applications leads to contamination and eventually requires sensors to be replaced. A differential pH sensor utilizes a measurement technique designed to extend the working lifetime of sensors in challenging applications. Replacing the sensor reference (salt bridge) and buffered electrolyte solution can prevent sensor replacements, saving time and money. Our SD7500 Series features a combination sensor output; these differential pH sensors can be used with any conventional pH/ORP transmitter.

• Differential measurement technology with solution ground
• Buffered electrolyte reference resists fouling
• Compatible with any conventional pH/ORP transmitter
• Easy and infrequent maintenance
• Automatic temperature compensation
• Two Year limited Warranty

The EM802-pH is our most cost-effective solution for connecting our S8000 series pH sensors to a PLC or SCADA system. This small electronic module functions as a blind pH transmitter with 4-20mA output. No additional instrumentation is required to condition the sensor signal to be read by your PLC or SCADA. It can also be used to pair Sensorex sensors with any controller that has a 4-20mA input card. Easily connects to our S8300 Modular pH Sensor Package to form a complete pH monitoring solution.

• Blind 4-20mA transmitter for connecting pH sensors to PLC or SCADA
• Small form factor saves valuable panel space
• Compatible with S8100 submersion pH sensor or S8300 inline pH sensor
• Compatible with PT1000 RTD temperature compensation

Our S272 series of pH sensors deliver reliable online pH monitoring for in-line or submersion installation configuration. Extended sensor lifetime with double-junction technology. Minimal maintenance required due to flat glass measurement surface. A versatile sensor for moderate and multi-purpose applications.

• Reliable performance in demanding applications
• Extended sensor lifetime
• Versatile design for submersion or in-line mounting
• One year limited warranty

Ideal for Light Industrial Process Applications

• Keyed flange ensures proper orientation for best results
• Temperature compensation ensures optimal performance

Reduce Maintenance Costs

• Quick-disconnect cable to allow for cables to remain in place
• Flat measurement surface resists coating
• Calibrations are even faster when used with Sensorex Electronic Modules

Smart Sensor-Capable via Sensorex Electronic Modules (Sold Separately) 

• Purchase with EM802-EC Module - sold separately
• Use with S856 Cable (Option FC)
• USB Converter for Smart Sensors (S857 - sold separately) recommended for calibration and set-up

For first time installations, select appropriate cable length and purchase FC875/T Flow Cell separately (shown under accessories).

Used for Laboratory and Light Industrial Applications: Cell constants are made from graphite to provide good performance for the value. Configurable to Meet Your Exact Needs: 

• Select from our options below for a quick delivery or fill out the contact us form at the bottom for a custom product!
• Choose your cell constant, temperature compensation, cable lengths, and connectors

Multiple Use Cases

• Submerge in a tank or mount in-line in a pipe.
• Compatible with Sensorex's CM1000 and most portable/bench-top meters

Some of our laboratory ORP electrodes, including the S550C-ORP/BNC, have gotten an update! Looking for a polymer body, double junction ORP electrode for lab use? Check out the ORP2000, which replaces the S550C-ORP in our new laboratory ORP electrode line. Want to know what else has changed? Download the Specification Sheet for Laboratory ORP Electrodes.

Our S8000 series of pH deliver the most reliable online pH monitoring in a unique, modular package that minimizes total cost of ownership. These sensor cartridges can be changed in a few seconds with no tools or re-wiring required. Extended sensor lifetime with ERP Reference System.

• Reliable performance in demanding applications
• Lightning fast sensor changes with no tools required
• Extended sensor lifetime
• All mounting hardware is reuseable. Only replace the quick-change sensor cartridge
• One year limited warranty

The EM802 ORP module can be used with electrode adapter EA891 (submersion without temperature sensor) or EA899 (in-line without temperature sensor).

Our S222 series of pH sensors are flexible for light-duty in-line or submersion online pH monitoring and control applications. Replace sensors in seconds with the quick disconnect BNC design. For use with the S653 series cable assembly, which comes equipped with 1/2" NPT threads for easy submersion installation. For in-line use, install with a 3/4" mounting gland (Sensorex FC75P; sold separately). For complete kit, purchase S222CD Light-Duty Online Process pH Sensor Kit.

• Reliable performance in light-duty applications
• Lightning fast sensor changes with simple quick disconnect BNC design
• Perfect for pressurized applications
• All mounting hardware is reuseable. Only replace the quick-change sensor cartridge
• One year limited warranty

Choose 4-20mA or MODBUS/RS485 Interface

Our S272 series of pH sensors deliver reliable online pH monitoring for in-line or submersion installation configuration. Extended sensor lifetime with double-junction technology. Minimal maintenance required due to flat glass measurement surface. A versatile sensor for moderate and multi-purpose applications.

• Reliable performance in demanding applications
• Extended sensor lifetime
• Optional 4-20mA or MODBUS/RS485 output
• Input Voltage Options:
  • 12V DC – MODBUS only
  • 24V DC – 4-20mA & MODBUS
• Versatile design for submersion or in-line mounting
• One year limited warranty

Viscous samples such as dairy products and paints can be difficult to measure with traditional bulb-shaped pH glass due to the possibility of breakage. Our S450CD features a flat glass measurement surface for maximum durability in viscous sample measurements. The double junction reference design prevents contamination by samples containing proteins, making this probe versatile for many different sample types.

• Rugged flat measurement surface
• Double junction prevents reference contamination
• Compatible with Sensorex flow cells for low volume measurements
• 15mm shaft diameter

The CX10 is a convenient and cost effective solution for monitoring conductivity or resistivity of water. Save space in your panel with the small footprint 1/8 DIN case. This EC transmitter displays conductivity or resistivity readings on an easy to read LCD screen. The 4-20mA signal output can be conveniently integrated into a range of process control systems.

• Easy to install 1/8 DIN Case
• Isolated, reversible 4-20mA output
• Compatible with sensor utilizing spade lug or tinned lead connectors
• Clear LCD displays conductivity, resistivity, or temperature
• 100-240 VAC power supply

Note: This EC transmitter is only compatible with sensors that have spade lug or tinned lead connectors and 10k NTC temperature compensation.