Instrumentation, Measurement and Control
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...
Pressure control products measure, monitor and regulate pressure in liquids, gases and steam. Accurate pressure control protects equipment and keeps processes stable.
Pressure Control Products
- Gauges – pressure, differential and specialty gauges
- Pressure transmitters and transducers – electronic monitoring
- Pressure switches – alarm and control set points
- Pressure regulators and sequence valves – control downstream pressure
- Accessories – snubbers, syphons, manifolds and gauge valves
Building a Measurement Point
Choose instrument range, accuracy and wetted materials, then add the right accessories, such as isolation valves and snubbers, for safe, accurate readings.
Centro supplies pressure control instruments and accessories from leading brands.
Shop by type: Pressure Transducers | Pressure Control Accessories | Gauges | Pressure Switch | Pressure Transmitters | Pressure Regulators | Sequence Valves
Related categories: Instrumentation, Measurement and Control | Controllers | Flow Control | Recorders | Seals and Accessories
We are proud to offer a wide selection of industrial seals and accessories for various applications. Our seals are from leading manufacturers with high-quality materials designed to provide long-lasting, reliable performance in demanding industrial environments. We offer various seal types, including O-rings, gaskets, and rotary shaft seals. Our O-rings are available in various sizes and materials, including nitrile, silicone, and fluoroelastomer. They are ideal for use in hydraulic and pneumatic systems, as well as in general-purpose applications. Our gaskets are also made from high-quality materials and are designed to provide a tight, reliable seal in various applications. They come in a wide range of standard sizes, and manufacturers can make special sizes to order. We also carry a wide selection of rotary shaft seals, which are used to seal the gap between a rotating shaft and a stationary housing. These seals help prevent leakage of lubricants and other fluids and are available in various styles and materials to suit different applications. In addition to seals, we also offer a range of accessories to help you install and maintain your seals, including lubricants, sealant, and installation tools.
Shop by type: Diaphragm Seals
Related categories: Instrumentation, Measurement and Control | Flow Control | Pressure Control | Controllers
Process controllers read signals from sensors and adjust outputs to hold temperature, pressure, flow or level at set point. They range from simple panel meters to advanced PID controllers.
Controller Products
- PID controllers – precise closed-loop control
- Process meters – display and alarm process signals
- Panel meters and displays – local indication
Choosing a Controller
Match inputs (thermocouple, RTD, mA, voltage) and outputs (relay, SSR, analog) to your process. Consider alarms, ramp/soak programming and communications. Panel size (1/16, 1/8, 1/4 DIN) affects layout.
Centro offers controllers and displays for process and temperature control.
Shop by type: Panel Meters and Displays | PID
Related categories: Instrumentation, Measurement and Control | Recorders | Pressure Control | Instrument/Compression Fittings | Flow Control
Recorders document process conditions over time for quality control, regulatory compliance and troubleshooting. Options range from traditional chart recorders to modern paperless and data logging systems.
Recorder Types
- Paperless recorders – digital recording with trend displays
- Chart recorders – circular and strip charts
- Data loggers – compact, battery-powered recording
Choosing a Recorder
Consider the number of inputs, recording interval, data retrieval and compliance needs. Paperless recorders eliminate charts and pens and simplify data export.
Centro supplies recorders, charts, pens and data loggers.
Shop by type: Data Loggers | Paperless Recorders | Chart Recorders
Related categories: Instrumentation, Measurement and Control | Instrument/Compression Fittings | Controllers | Sensors | Pressure Control
Compression fittings are used in a variety of industries for a multitude of applications. Compression fittings are most commonly used in applications where copper or brass tubing is inserted into the fitting. The ferrule then compresses the tubing, creating a watertight seal. Compression fittings can be found in everything from plumbing and refrigeration to automotive and aerospace applications. Our team is proud to offer a wide variety of compression fittings, ensuring that you'll find the perfect solution for your needs. Centro carries instrument and compression tube fittings in stainless steel and brass, along with tubing, valves and adapters to complete your instrument lines. Please browse our website to learn more about our products and services.
Related categories: Instrumentation, Measurement and Control | Sensors | Recorders | Analytical Tools | Controllers
Instrumentation valves provide precise fluid control for measurement, sampling, and process control systems. Shop instrumentation solenoid valves for automated on/off switching in control loops, needle valves for fine flow adjustment in analyzer and transmitter installations, proportioning valves for electronically modulated flow control, and air-actuated valves for remote operation in process environments. Built-in materials like 316 stainless steel, brass, and PTFE, these small-bore instrumentation valves are designed for tight spaces, high pressures, and compatibility with gases, liquids, steam, and corrosive media. Browse our full selection of instrumentation valves below to find the right fit for your application, or contact us for sizing and selection assistance.
Related categories: Instrumentation, Measurement and Control | Seals and Accessories | Flow Control | Pressure Control | Controllers
Industrial sensors monitor humidity, gas, flame, moisture and dew point to protect people, products and equipment. They feed critical data to control and safety systems.
Sensor Categories
- Humidity sensors – HVAC and environmental control
- Gas detection sensors – toxic and combustible gases
- Flame detection sensors – burner and fire safety
- Moisture in oil sensors – lubrication and transformer monitoring
- Dew point sensors – compressed air and gas dryness
Choosing a Sensor
Define what you need to measure, the range, accuracy and output signal, plus environmental and hazardous area ratings. Plan for calibration and maintenance.
Centro supplies industrial sensors for monitoring and safety applications.
Shop by type: Humidity Sensors | Gas Detection Sensors | Moisture in Oil Sensors | Dew Point Sensors
Related categories: Instrumentation, Measurement and Control | Analytical Tools | Instrument/Compression Fittings | Level Control | Recorders
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 our products come 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.
Shop by type: Conductivity | pH
Related categories: Instrumentation, Measurement and Control | Level Control | Sensors | Temperature Measurement, Instrumentation and Control | Instrument/Compression Fittings
Level control is essential for many industrial and commercial applications, ranging from simple water tanks to complex chemical processing systems. Industrial applications often require control to maintain safe and efficient operations. This can be accomplished through the use of float switches or differential pressure control. Float switches are devices used to measure the level of a liquid in a tank. They work by using a float that is attached to a switch. When the float rises or falls with the level of the liquid, the switch is activated. This can then be used to trigger an alarm or shut off a pump. Differential pressure control is another level control method that uses pressure sensors to measure the difference in pressure between two points. This can be used to determine the liquid level in a tank. Differential pressure control is often used in applications requiring precise level control. We carry a complete selection of level-control products to meet your needs. Our float switches are ideal for small-scale applications, while our radar and differential pressure control systems are designed for more demanding environments. We also offer load cells for use in weight-based level measurement. Whether you need a simple float switch or a sophisticated differential pressure system, we have your level control products.
Shop by type: Bulk Solids | Liquid Level
Related categories: Instrumentation, Measurement and Control | Temperature Measurement, Instrumentation and Control | Analytical Tools | PVF | Sensors
We carry a complete selection of temperature measurement, instrumentation, and control devices to suit any industrial or commercial application. For various reasons, temperature measurement, instrumentation, and Control products are critical to industrial systems. Thermocouples, for example, are used extensively in industry to measure temperatures in a wide range of applications. Temperature switches are used to control the temperature of a process or system. All three of these products are essential to properly functioning industrial systems. Whether you need a simple temperature gauge for an easy fix or a sophisticated control system for a large factory, we have the products and expertise to meet your needs. Thermocouples, temperature switches, thermometers, and transmitters are available online, and our knowledgeable staff is always on hand to answer any questions. So please browse our selection today and find the perfect solution for your temperature monitoring needs.
Shop by type: Heat Exchangers | Temperature Accessories | Thermometers | Thermocouples and RTDs | Temperature Switches | Temperature Controllers | Temperature Recording | Temperature Transmitters
Related categories: Instrumentation, Measurement and Control | PVF | Level Control | Swivel Joints | Analytical Tools
Swivel joints are crucial components used to connect pipes or hoses in a fluid system, allowing for rotation and movement in various directions. These versatile joints are commonly employed in industries like oil and gas, chemical processing, and firefighting, where flexible connections are essential to accommodate movement, vibration, and thermal expansion. Swivel joints provide a reliable solution for preventing hose or pipe kinks, reducing stress on equipment, and enabling smooth fluid transfer even in challenging environments. With different sizes, materials, and pressure ratings available, swivel joints offer the flexibility needed to meet specific application requirements and ensure efficient fluid handling.
Related categories: Instrumentation, Measurement and Control | Hydraulic Accessories | PVF | Temperature Measurement, Instrumentation and Control | Level Control
Flow control products measure, monitor and regulate the movement of liquids and gases through a process. Accurate flow data helps you control dosing, track usage, protect pumps from running dry and confirm that cooling, lubrication and treatment systems are working.
Flow Control Products
- Flow meters – magnetic, turbine, positive displacement, thermal and variable area
- Flow switches – alarm or shut down when flow drops too low or rises too high
- Flow sensors and transmitters – send continuous flow signals to your control system
- pH and conductivity instruments – monitor water quality along with flow
- Flow control accessories – fittings, displays and mounting hardware
Choosing a Technology
The fluid decides the technology. Magnetic meters need a conductive liquid, thermal meters are built for gases, and positive displacement meters handle viscous oils. Consider accuracy, pipe size, pressure drop, straight-run requirements and the output your controller needs.
Centro's instrumentation team can help you select flow control products that match your fluid, line size and accuracy needs.
Shop by type: Flow, pH & Conductivity Meters, Transmitters & Controllers | Flow Control Accessories | Flow Sensors | Flow Meters | Flow Transmitters | Flow Switches
Related categories: Instrumentation, Measurement and Control | Pressure Control | Seals and Accessories | Controllers
When it comes to instrumentation systems, precision and reliability are key. Pipes, valves, and fittings (PVF) are critical in maintaining accurate measurements, controlling pressure, and ensuring smooth operation in industrial processes. Stauff PVF products are designed to handle high pressures, temperature fluctuations, and corrosive environments, making them ideal for industries like oil and gas, chemical processing, power generation, and manufacturing.
What Stauff PVF Products Do We Offer?
We provide a full range of Stauff PVF components built for instrumentation applications, including:
- Instrumentation tubing – High-quality stainless steel tubing for precise fluid and gas control.
- Needle valves – Allow for fine adjustments and accurate flow regulation.
- Ball valves – Provide quick on/off control for efficient system management.
- Check valves – Prevent backflow and protect sensitive instrumentation.
- Tube fittings and adapters – Available in various configurations to ensure leak-free connections.
- Manifold valves – Streamline pressure control and system isolation in complex setups.
Why Choose Stauff PVF Products?
- Precision-engineered for demanding applications.
- Corrosion-resistant materials ensure durability in harsh environments.
- Leak-free performance keeps systems running efficiently.
- Wide compatibility with different instrumentation setups.
Find the Right PVF Solution
Whether you're setting up a new instrumentation system or upgrading existing components, Stauff PVF products offer the reliability and performance you need. Browse our selection online or reach out to our team for expert guidance in choosing the right components for your application.
Related categories: Instrumentation, Measurement and Control | Swivel Joints | Temperature Measurement, Instrumentation and Control | Hydraulic Accessories | Level Control
Hydraulic accessories keep hydraulic systems clean, sealed and reliable. Filters and O-rings are small parts that prevent costly failures.
Accessories Available
- Hydraulic filters – pressure, return and suction
- Hydraulic O-rings – seals for fittings and components
- Breathers – reservoir protection
- Gauges – system monitoring
Maintenance Tips
Monitor filter indicators, replace seals during service and keep oil clean to extend component life.
Centro supplies hydraulic accessories.
Shop by type: Hydraulic Filters | Hydraulic O-Rings
Related categories: Instrumentation, Measurement and Control | Swivel Joints | PVF | Temperature Measurement, Instrumentation and Control | Level Control
$207.73
Subject to factory lead times
$245.55
Subject to factory lead times
$64.74
Subject to factory lead times
$1,628.60
$254.12
Subject to factory lead times
$171.43
Subject to factory lead times
$453.79
Subject to factory lead times
$212.47
Subject to factory lead times
$149.15
Subject to factory lead times
$101.75
Subject to factory lead times
$129.28
Subject to factory lead times
$98.83
$1.96
Subject to factory lead times
$20.44
$129.28
$372.75$497.00
$1,482.38
Subject to factory lead times
$417.75$557.00
$417.75$557.00
$1,727.43
Subject to factory lead times
$1,824.08
$264.65
Subject to factory lead times
$586.09
Subject to factory lead times
$808.95
Subject to factory lead times
$207.73
Subject to factory lead times
$245.55
Subject to factory lead times
$64.74
Subject to factory lead times
$1,628.60
$254.12
Subject to factory lead times
$171.43
Subject to factory lead times
$453.79
Subject to factory lead times
$212.47
Subject to factory lead times
$149.15
Subject to factory lead times
$101.75
Subject to factory lead times
$129.28
Subject to factory lead times
$98.83
$1.96
Subject to factory lead times
$20.44
$129.28
$372.75$497.00
$1,482.38
Subject to factory lead times
$417.75$557.00
$417.75$557.00
$1,727.43
Subject to factory lead times
$1,824.08
$264.65
Subject to factory lead times
$586.09
Subject to factory lead times
$808.95
Subject to factory lead times
- 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.