Process Instrumentation

Take precise control of process with the best selection of process instrumentation and control solutions in the Midwest. Flow and pressure measurement, temperature, humidity, pH; whatever you need to measure we have the instruments to do it.

Durkin’s team has been specializing in process instrumentation for since 1958. Our experts can help you select, install, and integrate the right process instrumentation for your application. We a proud to distribute top brands, primarily: ABB process instrumentation, Dynasonics, KOBOLD and more.

Explore our full instrumentation catalog below, or contact Durkin (314) 432-2040 for more information.

ABB Level KM26


The KM26 Magnetic Level Gauge has provided custom engineered solutions to liquid level applications in industries such as: oil and gas, refinery, chemical, petrochemical, power generation and many more. The KM26 MLG has proven itself to be a safe, reliable, maintenance free solution for total and/or interface level detection in toxic, corrosive, high pressure and high temperature processes. Features:
  • Highly visible level indication with no process fluid in contact with the glass
  • All construction in-house by code certified welders
  • Float designed and weighted for maximum accuracy with 75 grams minimum upward buoyant force
  • Transmitter and switch options which can be installed, adjusted and maintained with no process interruption
  • Safe for corrosive, flammable, toxic, high-temperature and high-pressure applications
  • Rugged design - low or no maintenance


Available materials − Stainless steel—304/304L, 316/316L, 317/317L, 321, 347, 904 − Alloy 20 − Hastelloy®—B, C-276 − Alloy 600, 625, 800, 825 − Titanium − Teflon® (registered trademark of DuPont) coated stainless steel − Fiberglass—epoxy or vinyl ester resin − PVC, CPVC, Kynar® − Polypropylene − Zirconium − Monel − For other materials consult factory Process capabilities − Full vacuum to 5000 PSI / 345 BAR − -320 to 1000 °F/ -196 to 538 °C − 0.25 specific gravity − All liquid viscosities − Interfaces as Low as .03 ΔSG Testing and documentation available upon request − Radiographic examination − Liquid dye penetrant examination − Hydrostatic examination − PMI (Positive Material Identification) material certification − ASME “U,” “UM,” or “S” stamp − Third party inspection − Material Certificates − ANSI/ASME B31.1, B31.3 − PED certification − NACE MR0103, NACE MR0175 − Canadian registration number (CRN) − Marine and industrial type approval for high-pressure boilers − Mechanical Function Test − Float Curves (Total Level only)
Process Instrumentation
Level Measurement

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How do I determine which instruments I need and their cost?

This depends on what you are needing to control or measure, your operating environment, your specific process flow, and many other factors. Durkin’s process specialists can help you determine the specific process instruments (down to the part number) that suit your application, budget, and expected life-span the best. Call (314) 432-2040 or contact us.

What is process instrumentation?

Process Instrumentation are sensors and instruments used to measure and control process variables including levels, flow, pressure, temperature, pH, and humidity.

In-field instruments, such as flowmeters or temperature sensors, are close to the process or measurement point, or may even have process liquids flowing through them. Panel instruments not usually where the process is happening, but are rather located ina controlled room or with the line controls.

Common types of process instrumentation include: flow meters, rotometers, level sensors, temperature sensors, recorders (to record process data), actuators, valves, gas analyzers, positioners, and actuators.

What symbols are used for process instruments?

Depending on the program, plant standards, and engineering firm that did the drawings, symbols for process instrumentation can vary. You should have been supplied with a lead or legend sheet that defines the symbols for the particular set of drawings you are looking at. However, there are a common set of generally agreed upon symbols, examples of which you can reference here.

Robert Cook at AiCHe has put out an excellent blog post on interpreting and using instrumentation symbols. If that doesn’t help, contact Durkin and one of our team members can help you solve the mystery: (314) 432-2040

Do you only supply the brands listed?

We carry a wide-range of process instrumentation and solutions. You can see our full supplier list here, but we may be able to source brands or point you the right distributor for other brands. More importantly, we can help you determine the appropriate instrumentation and controls solutions needed to solve your process issues. Talk to one of our experts today: (314) 432-2040 or fill out a contact form.