Tel: (586) 254-6500 · Fax: (586) 254-6509
6500 Dobry Dr., Sterling Heights, Michigan 48314
DELTA TUBE APPLICATION WORKSHEET
Models
300, 301, 302, 306, 307/308, 311/312
321, 322, 331, 332, 323, 341 thru 391
342 thru 392, 343 thru 393

THE SHAPE OF TOMORROW IS HERE TODAY IN THE NEW
“TEAR-DROP” SHAPED AVERAGING PITOT TUBES IN BOTH
1/2" AND 1" FLOW ELEMENTS.
DELTA TUBE STEAM SELECTION GUIDE
APPLICATION & SYSTEM DESIGN DATA
  • “Tear-Drop” Shaped Flow Elements Compare Favorably to “Other” Shapes Offered in the Field.
  • Flow Elements Feature an Anti-Blowout Ring for Safe Field Operation.
  • Offered with Both 1/4" FNPT (Standard) and 1/2" FNPT Instrument Connections.
  • Accuracy up to +/- 1.0% of Actual Flow, Repeat Accuracy +/- 0.1%.
  • Suitable for use in the Measurement of Liquids, Gases, or Steam.
  • Designed for Use with Differential Pressure Gauges, Transmitters, Totalizers, and Chart Recorders.
  • Easy, Cost-efficient Installation and Operation.
  • Custom Application Design and Manufacture Readily Available.
  • Instrument Valves (Needle) Available in Carbon Steel or Stainless Steel, (Plug) Brass.
  • Direct Transmitter Mounts Available on “Insertion-Type Sensors”
  • OS&Y Gate Valves can be substituted for Ball Valves on Hot Tap Applications
  • Pipe Saddles and Saddle Clamps Available for Non-metal Pipe Applications.
Download Delta Tube Software
Mid-West Instrument .s Delta Tube Software is used to determine what Model Number meets the required parameters of your specific flow system. The program calculates the differential pressures generated when a Delta Tube is used to measure flow in a pipe or duct for liquid, gas or steam applications. You are asked to supply fluid data and flow conditions, such as flow rates, temperatures and pressures, which are used to ensure that structural limits are not exceeded.
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The Model 300 Series Inline Delta Tube Flow Element may be used for the measurement of flow in pipe lines from 1/2" NPS through 3" NPS. The Model 300 Series utilizes two averaging flow elements of equal area to sense stagnation (RAM) and static differential pressure providing minimum permanent pressure loss. This flow element can be supplied with your choice of plain, threaded, or flanged end connections in a wide variety of materials.
The Model 301/303 Series (1/2" Diameter) and Model 302 (1" Diameter) Flow Element Insertion-Type Sensors may be used for the measurement of flow in pipe lines from 2.0" through 36.0" (larger line sizes can be supplied upon request). These flow elements utilize a unique “tear-drop” shaped averaging pitot tube with anti-blowout protection. They provide low permanent pressure loss sensitivity to misalignment with respect to flow accuracy.
The Models 306, 307, 308 Series Delta Air or Delta Duct Insert-Type Flow Element Sensors are designed for the flow measurement of air (model 306) and other gases (Models 307 & 308) for duct applications. They may be installed in round or rectangular ducts from 6.0" (15.0 cm) through 144.0" (370 cm). These flow elements utilize the “tear-drop” shaped averaging pitot tube which provides low permanent pressure loss and low sensitivity to misalignment with respect to flow accuracy.
The Models 311, 312, 321, 322, 323, 331, 332 Delta Tap Insertion-Type Flow Elements are designed for insertion and removal in a pressurized system. The Delta Tap Series can be installed and provide flow measurement information without the necessity of system shutdown.
The Models 341 thru 391, 342 thru 392, and 343 thru 393 Delta Tube Flanged Flow Elements are designed for measurement of flow in pipe lines from 14" (35.5 cm) through 60" (152.4 cm). They are available with 150# flanges as standard and optionally with class 300# thru 2500# flanges in ANSI or Metric.
Delta Tubes and Delta Taps can be optionally supplied with Steam Kits which conform to ASME code for pressure piping (ANSI/ASME B31.1). The twofold purpose of the steam kit allows for safe isolation and shut-off of the instrumentation and provides for establishing a constant condensate head on the instrumentation, so that maximum accuracy may be maintained.