Instrumentation, Measurement and Control - Van London
Instrumentation refers to devices that measure or control physical variables such as temperature, level, flow, or pressure. These products are essential in the industry because they allow for maximum output with mi...
pH probes, also known as pH sensors or electrodes, are essential tools in analytical chemistry and various industrial processes for measuring the acidity or alkalinity of a solution. These probes operate based on the principle of detecting hydrogen ion concentration in a given medium. Typically composed of a glass electrode and a reference electrode, pH probes generate a voltage signal proportional to the pH of the solution being measured. The glass electrode, sensitive to hydrogen ions, facilitates the conversion of chemical information into an electrical signal. Accurate pH measurements are crucial in diverse applications, ranging from scientific research and environmental monitoring to quality control in food and beverage production. pH probes find utility in laboratories, water treatment plants, pharmaceutical manufacturing, and many other industries where precise control of acidity or alkalinity is imperative for maintaining optimal conditions and ensuring the quality of end products. Regular calibration and maintenance are essential to uphold the accuracy and reliability of pH probes in various settings.
At Centro, we carry a complete selection of analytical tools for purchase online. This includes everything from analytical probes and transmitters to conductivity probes. Industrial applications often require the use of Analytical Tools including Analytical Probes, Analytical Transmitters, and Conductivity Probes to measure various parameters. These probes can be used to measure things like pH, conductivity, temperature, and more. Each type of probe has its own unique benefits and drawbacks, so it's important to choose the right one for the job at hand. Analytical Probes are often used for measuring pH, as they are very accurate and precise. Analytical Transmitters are good for measuring conductivity, as they are able to transmit a signal over long distances. Conductivity Probes are often used for measuring temperature, as they are very sensitive to changes in temperature. When choosing a probe for an industrial application, it's important to consider the accuracy, precision, and sensitivity of the probe. Analytical Probes, Analytical Transmitters, and Conductivity Probes are all great choices for industrial applications, so it's just a matter of choosing the right one for the job. Whether you need a single piece of equipment or a complete set, we have you covered. We also offer a wide range of accessories so that you can tailor your purchase to your specific needs. And because we source our products from leading manufacturers, you can rest assured that you're getting the highest quality tools on the market. So please browse our selection today and find the perfect analytical tool for your needs.
pH probes and transmitters constitute a dynamic duo in the realm of pH measurement, offering sophisticated and precise tools for assessing the acidity or alkalinity of solutions. pH probes, often composed of a sensitive glass electrode and a reference electrode, function by converting the concentration of hydrogen ions into electrical signals. These probes are adept at delivering accurate and real-time pH readings, making them indispensable in laboratory research, industrial processes, and environmental monitoring. Paired with pH transmitters, which amplify and convert the electrical signals from the probes into a format suitable for interpretation and display, these tools provide a comprehensive solution for continuous pH monitoring. pH transmitters offer additional features such as data logging, remote access, and integration with control systems, enhancing their utility in complex industrial operations. This combination of pH probes and transmitters ensures not only precise measurements but also facilitates efficient and automated pH control in diverse applications, contributing to the optimization of processes and the maintenance of desired conditions. Regular calibration and maintenance routines are vital to guarantee the reliability and longevity of these pH tools in critical analytical and industrial settings.
Conductivity probes measure the electrical conductivity of liquids. These probes typically consist of electrodes that immerse into the liquid to assess its ability to conduct electricity, which correlates with ion concentration and purity. Conductivity probes provide real-time data for providing optimal conditions and compliance with industry standards. Browse our selection below or contact us to speak with a product expert.
Centro offers a wide range of flow, pH, and conductivity meters, transmitters, and controllers to meet the demands of various industrial and commercial applications. From monitoring flow rates and maintaining chemical balance for fluid quality and consistency, our solutions are engineered for precision, reliability, and seamless integration. We provide products such as magnetic and ultrasonic flow meters, pH controllers, and conductivity transmitters designed to optimize performance in industries like water treatment, food and beverage, chemical processing, and pharmaceuticals.
Whether you need accurate measurements, durable equipment, or easy system integration, Centro has the expertise and products to support your operations. Explore our selection online or contact our team to find the right solution for your application and ensure peak system efficiency.
Conductivity analytical tools play a pivotal role in measuring the ability of a solution to conduct electric current, providing valuable insights into the concentration of dissolved ions. These tools are widely used in various scientific, industrial, and environmental applications to assess the purity and composition of liquids. The principle underlying conductivity measurements involves the detection of ions, which enhance electrical conductivity in a solution. The greater the concentration of ions, the higher the conductivity. Commonly employed in water quality testing, pharmaceutical manufacturing, and chemical process control, conductivity analytical tools assist in monitoring the effectiveness of water treatment processes, ensuring compliance with regulatory standards, and maintaining the integrity of industrial processes. The versatility of conductivity measurements extends to applications such as detecting contaminants, assessing the salinity of water bodies, and optimizing the efficiency of chemical reactions. Regular calibration and maintenance are essential to ensure the accuracy and reliability of conductivity analytical tools, contributing to their indispensable role in analytical chemistry and industrial quality control.
pH transmitters play a crucial role in the field of analytical instrumentation by converting electrical signals from pH probes into usable data for monitoring and control systems. These devices enhance the functionality of pH measurement tools, such as pH electrodes or probes, by amplifying and transmitting the signals they generate. pH transmitters are essential in industrial processes where maintaining a specific pH level is critical for product quality or process efficiency. These transmitters not only provide accurate and continuous pH readings but also offer additional features such as data logging, remote access, and integration with control systems. This allows for real-time monitoring and adjustments to ensure optimal conditions. pH transmitters find applications in diverse industries, including chemical manufacturing, water treatment, and food production, contributing to improved process control and overall operational efficiency. Regular calibration and maintenance are essential to uphold the accuracy and reliability of pH transmitters, ensuring their effectiveness in various analytical and industrial settings.
Conductivity transmitters measure and transmit electrical conductivity levels in liquids. These transmitters convert conductivity measurements into standardized electrical signals (such as 4-20 mA) for monitoring and control systems. Conductivity transmitters provide real-time data to optimize processes and ensure compliance with regulatory standards. Browse our selection below or contact us to speak with a product expert.
$562.85
Subject to factory lead times
$4,235.47
$842.68
Subject to factory lead times
$406.11$464.12
$456.32
Subject to factory lead times
$631.24
Subject to factory lead times
$4,235.47
$175.75$200.85
$227.65
$98.45
Subject to factory lead times
$98.45
Subject to factory lead times
$255.76
$23.29$26.61
$378.85
Subject to factory lead times
$447.26
$160.50$183.42
$183.42$209.62
$209.41
$210.94$241.07
$308.15
$155.05$177.19
Subject to factory lead times
$217.80
Subject to factory lead times
$296.13
$221.33
$562.85
Subject to factory lead times
$4,235.47
$842.68
Subject to factory lead times
$406.11$464.12
$456.32
Subject to factory lead times
$631.24
Subject to factory lead times
$4,235.47
$175.75$200.85
$227.65
$98.45
Subject to factory lead times
$98.45
Subject to factory lead times
$255.76
$23.29$26.61
$378.85
Subject to factory lead times
$447.26
$160.50$183.42
$183.42$209.62
$209.41
$210.94$241.07
$308.15
$155.05$177.19
Subject to factory lead times
$217.80
Subject to factory lead times
$296.13
$221.33
- Selecting the right process instrument starts with defining four things: what variable you need to measure (temperature, pressure, flow, or level), the process conditions the instrument will face (media type, temperature range, pressure range, corrosiveness, and whether the environment is hazardous), the accuracy and response time your application requires, and how the measurement data needs to be communicated (local display only, 4–20 mA signal to a PLC/DCS, or digital protocol like HART or Modbus). For temperature, the choice between thermocouples, RTDs, and infrared sensors depends on the temperature range and accuracy needed. For pressure, gauge type, range, wetted materials, and whether you need local indication or a remote transmitter signal are the key decisions. For flow, the fluid properties (conductive liquid, gas, steam, slurry) determine whether a magnetic, ultrasonic, Coriolis, vortex, or variable-area meter is the best fit. For level, vessel conditions (open vs. pressurized, clean liquid vs. foam/solids) guide the choice between float switches, ultrasonic, radar, or differential pressure technologies. Centro's instrumentation specialists can help you match the right technology to your specific process conditions and budget.
- Accurate process instrumentation is the foundation of safe, efficient, and compliant operations. Every control loop — whether it manages boiler pressure, reactor temperature, tank level, or pipeline flow — depends on instruments that provide reliable, real-time measurements. If a temperature sensor reads inaccurately, a heater may overshoot and damage the product or create a safety hazard. If a level transmitter drifts, a tank may overflow or run dry. If a flow meter is undersized, the control system cannot maintain the correct feed rate. Beyond safety and quality, accurate instrumentation directly impacts energy consumption, raw material usage, and regulatory compliance. Calibrated, properly specified instruments reduce waste, prevent unplanned shutdowns, and provide the data required for regulatory reporting and quality documentation.
- A process control loop is a system that continuously measures a process variable, compares it to a desired setpoint, and adjusts an output to keep the variable at the setpoint. The loop consists of three elements: the sensor/transmitter (measures the variable — e.g., a thermocouple measuring temperature), the controller (compares the measurement to the setpoint and calculates a corrective output — typically a PID controller), and the final control element (adjusts the process — e.g., a control valve that opens or closes to change steam flow). Instruments are the eyes and ears of the loop — without accurate, responsive sensors and transmitters, the controller cannot make correct decisions, and the process drifts out of specification. The entire loop must be properly engineered as a system — sensor accuracy, transmitter range, controller tuning, and valve sizing must all be matched to the process requirements.
- Industrial instruments communicate with controllers and PLCs using standardized electrical signals. The 4–20 mA analog current loop is the most widely used signal in process instrumentation — it transmits a variable measurement as a proportional current (4 mA = zero/low range, 20 mA = full scale), and the current-based signal is resistant to voltage drop and electrical noise over long cable runs. The 0–10 V DC voltage signal is used in some HVAC and building automation applications but is more susceptible to noise and cable length limitations. Discrete (on/off) signals — from switches, relays, and transmitter alarm contacts — indicate threshold conditions like high level, low pressure, or flow/no-flow. Digital communication protocols — HART (layered on top of 4–20 mA for configuration and diagnostics), Foundation Fieldbus, PROFIBUS PA, and IO-Link — enable bidirectional communication between the instrument and the control system for advanced diagnostics, remote configuration, and multi-variable data.
- When instruments are installed in locations classified as hazardous (areas where flammable gases, vapors, or combustible dusts may be present), they must be approved for that classification to prevent ignition. Key considerations include the area classification (Class I for gases/vapors, Class II for dusts, with Division 1 for normally present hazards and Division 2 for abnormal conditions — or Zone 0/1/2 under ATEX/IECEx), the protection method (intrinsic safety, explosion-proof, non-incendive, or purged/pressurized), and the specific gas group and temperature class. Intrinsically safe (IS) instruments — used with IS barriers in the safe area — limit energy to levels too low to cause ignition and are the most common and practical approach for low-power sensors and transmitters. Explosion-proof enclosures contain any internal explosion and are used for higher-power devices. Always verify the instrument's certification (FM, CSA, ATEX, IECEx) matches the area classification before installation.




