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 LMT100-2 Floats


The LMT100 is based upon the magnetostrictive principle. 1. The device electronics generates a low energy current pulse at fixed intervals. 2. The electrical pulses create a magnetic field which travels down a specialized wire inside the sensor tube. 3. The interaction of the magnetic field around the wire and the magnetic float causes a torsional stress wave to be induced in the wire. This torsion propagates along the wire at a known velocity, from the position of the magnetic float and toward both ends of the wire. 4. A patented sensing element placed in the transmitter assembly converts the received mechanical torsion into an electrical return pulse. 5. The microprocessor-based electronics measures the elapsed time between the start and return pulses (Time of Flight) and converts it into a position measure- ment which is proportional to the level of the float. LMT100 is preferred for: • Interface Measurement • Exceptional performance with emulsion • Measurement with foam on layers fluid surface • Hydrocarbons and chemical control Features:
  • High accuracy: 0.01% of full scale or + 1.27mm
  • Never requires re-calibration: set it & forget it
  • Superior Sensor (Patent #5,473,245)
  • Local indication with HMI display
  • Dual compartment housing with separate field terminal compartment
  • Loop powered to 22m (75ft) probe length
  • Total and/or interface level measurement
  • Pressure to 165.48 bar (2400 psig) Std. 124.1 bar (1800 psig)
  • Temperature range: -195.5 to 426.6ºC (-320 to 800ºF) with options
  • Field replaceable/upgradable electronics module
  • Built-in RFI/EMI filter
  • Digital communications
  • Two level indications
  • RTD for process temperature measurement
  • Glass viewing window
  • 316/L Stainless Steel enclosure
  • 21-point linearization table


ELECTRONIC TRANSMITTER Repeatability: ± 0.005% of Full Scale or 0.305 mm (0.012 in), whichever is greater Non-linearity: ± 0.01% of Full Scale or 0.864 mm (0.034in), whichever is greater Measuring accuracy: ± 0.01% of Full Scale or 1.27 mm (0.050 in), whichever is greater1 Supply voltage: 12 to 42 Vdc - 4-20mA HART loop powered Output/Communications: 4-20mA HART7® User Interface: Interactive display, DTM, EDDL with NE107 messaging Power consumption: 4-20mA:                           at 36.0 Vdc - 3.6mA 0.13 watts; 21mA 0.76 watts at 12.0 Vdc - 3.6mA 0.043 watts; 21mA 0.25 watts HART mode (4.0mA):      at 36.0 Vdc 0.144 watts at 12.0 Vdc 0.048 watts Maximum line resistance:  4-20mA:                           at 36.0 Vdc and 21mA, 1142 ohms* at 24.0 Vdc and 21mA, 571 ohms at 12 Vdc and 21mA, < 72 ohms** *Maximum allowable with HART® communication is 700 ohms **See the current/resistance chart HART mode (4.0mA):       < 650 to 700 ohms Polarity protection: 4-20mA, Diode in series with loop, FOUNDATION Fieldbus and Profibus PA, polarity insensitive Update rate: 10 measurements per second Minimum measuring span: 76.2 mm (3.0 in), consult factory if smaller span is required Damping: Field Adjustable, Range: 0.1 to 60 seconds Alarm output: NE43, Software or Hardware selectable. Upscale (21 mA) or Downscale (3.6 mA) Surge Suppression Integral surge suppression available with option code S1 Ambient temperature: -40 to 85ºC (-40 to 185ºF) Ambient2 Humidity: 0 to 100% RH Linearization: 21 Point Table Available Temperature sensor (optional): 1000 ohm Pt RTD, option code SER or STL Temperature tolerance class: IEC 60751 Class B, + (0.3+0.005[t]), -700 to 2300C Enclosure: Dual Compartment Enclosure material: Cast Low Copper Aluminum with Powder Coat or 316 Stainless Steel Device tag material: AISI 316 Stainless Steel Electrical connection: Two M20 x 1.5 or two 1/2in. FNPT, adapters and bus connectors also available Ingress protection: IP66, NEMA 4X Notes: 1 Measurement accuracy is recorded at factory ambient conditions (23.88 °F +/-5.6 °C (75 °F +/-10 °F)) using a calibration magnet. Accuracy may be further influenced by other factors such as float hysteresis, installation, process conditions and ambient conditions. 2 Some agency approvals may differ. HART® is a registered trademark of the FieldComm Group SENSOR TUBE Material: Standard: 316/L Stainless Steel Options:   Alloy 20, Hastelloy® C-276, FEP-TEFLON® jacketed, electropolished 316/316L Stainless Steel, others on request Process temperature: Standard: -195.5 to 121.1ºC (-320 to 250ºF) Options:   up to 427ºC (800ºF) with options Process pressure:  Standard: -1.0 to 124.1 bar @ 149ºC (-14.7 to 1800 psig @ 300ºF) Options:   165.47 bar (2400 psig) maximum with the HP probe type Probe length: Standard: 304.8mm to 9.14m (1 to 30 ft) Options:   22.86m (75ft) maximum w/ W7 flexible probe in sensor well Probe length tolerance: Standard/Options: ± 3.2mm (0.125in) up to 3.0m (10ft); +/- 6.4mm (0.25in) up to 6.0m (20ft); ± 9.0mm (0.35in) up to 9.0m (29.5ft); +/- 25.4mm (1.0in) up to 22.86m (75ft) Mounting: Standard:3/4 in MNPT compression fitting Options:plugs, threaded fittings, loose flanges
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.