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Mid-West Instrument is one of the leading designers and manufacturers of differential pressure gauges and switches in the U.S. Experienced engineers and technicians utilize the latest equipment for engineering, manufacturing and testing the firm's gauge and switch products. All Mid-West Instrument products are manufactured in the United States and are backed by an industry leading Five (5) Year Warranty. Mid-West also produces a line of "Averaging Pitot Tubes" sold under the "Delta-Tube" brand as well as portable test kits, pulsation dampeners and pressure limiting valves. Oil, Gas, Water, Chemical, Petrochemical, Power Generation and Gas Liquidification are a few of the industries served. |
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Piston Type DP · Diaphragm Type DP · Bellows/Bourdon DP Hazardous Locations · Indicating Transmitters · Cryogenic/Liquefied Gas DP Indicators · Backflow Kits · Valves & Dampeners · Pitot Tubes |
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Differential Pressure is sensed by the movement of a precisely ground floating piston/magnet in a precision bore against a calibrated spring. Any variation in pressure on either side of the piston/magnet will cause the magnet to move proportionally to the change in differential pressure. A rotary pointer magnet located close to the internal magnet, but outside the pressure housing, follows the movement of the piston magnet and indicates differential pressure on the dial. Piston-Type Differential Pressure Gauges are available with one or two hermetically sealed reed switches. The switches are adjustable within a defined percentage of the full scale range of the gauge and are available in SPDT and SPST, normally open or normally closed configurations for various load/power ratings. The switches can be set to activate or deactivate on rising or falling pressure. Switches are "CE" marked per the EU low voltage directive.
Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | |
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Model 120 "Filter Minder"
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Model 121 "Filter Minder"
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Model 122 "Filter Minder"
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Model 123 "Filter Minder"
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Model 124 High Pressure "Filter Minder"
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Differential Pressure is sensed by the movement of an elastomer diaphragm against a precision calibrated range spring. The change in position of the diaphragm in response to the change in Differential Pressure moves an internal magnet. This magnet, in turn, causes a rotary magnet external to the gauge body to rotate. This rotary magnet has a pointer attached which indicates the differential pressure on the dial. Diaphragm-type Differential Pressure Gauges are available with one or two hermetically sealed reed switches. The switches are adjustable (see table for the adjustment range) within a defined percentage of the full scale range of the gauge and are available in SPDT and SPST, normally open configurations for various load/power ratings. The switches can be set to activate or deactivate on rising or falling pressure. Switches are “CE” marked per the EU low voltage directive.
Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | |
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Model 130 "Delta Gauge"
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Model 140 / 141 Delta Meter
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Model 142 Delta Meter
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The Model 105/106 bellows design provides a simple, compact, accurate, direct-acting, low range differential pressure indicator. The Model 109 encapsulated Bourdon tube design provides a simple, compact, and accurate differential pressure indicator.
Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | |
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Model 105/106 Bellows Design The major components of the Model 105/106 are a two-piece body, bellows sensing element and over-pressure assembly, a torque tube assembly, a range spring and the gauge front assembly. The body halves provide the pressure containment function. They also clamp the sensing element and over-pressure assembly between the halves, isolating the high side and low side pressures of the system. The high side body half also provides a mount for the torque tube assembly and the gauge front assembly. The sensing element is exposed to the differential pressure and deflects in response to the differential pressure. This assembly incorporates a bidirectional relief valve which provides over-pressure protection in both directions. When over-pressured from the high side, the valve is opened by a mechanical stop as the sensing element deflects to its maximum travel. When over-pressured from the low side, the spring-loaded valve opens when the differential pressure exceeds its maximum rating. The opening of the valve in either direction equalizes the pressure and protects the unit. A range spring is provided to adjust the spring rate of the system to suit the various differential pressure ranges of the instrument. |
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Model 109 Bourdon Tube Design The Model 109 is powered by a test quality Bourdon Tube Assembly. The assembly is encapsulated in a high pressure chamber that is fitted with a pressure connection to the inside of the Bourdon Tube and a second connection to the pressure chamber. The Model 109 indicates the difference between the pressure applied inside the Bourdon Tube and the pressure inside the chamber. The pressure chamber for the assembly is small, close fitting and rugged. The volume displacement of the Bourdon Tube through the pressure range is near to zero (0.02 c.c.). The speed of response of the indicator to changes in differential pressure is instantaneous, even on low volume pressure systems. The low volume displacement is an important advantage for differential pressure leak detection, and when isolation diaphragms are required. The Bourdon Tube Assembly is protected against over-range in either direction to the rated working pressure by a bi-directional relief valve. The output shaft of the gauge assembly is magnetically coupled through the solid wall of the pressure chamber to a sensitive jeweled pointer shaft in the dial housing outside the chamber. The magnetic coupling transmits the exact motion of the assembly to the pointer to give an accurate dial reading of the differential pressure. |
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Mid-West Instrument has been designing and manufacturing indicating differential pressure switches for use in Hazardous Locations for over 30 years. Their products carry CSA, UL, and or ATEX certifications that apply to the entire assembly as mandated by the applicable Hazardous Locations Standards. In order to mark their product with the CSA & UL marks, Mid-West Instrument is subject to unannounced visits by personnel from each certification lab 4 times per year. In addition, for the ATEX certification, they are subject to a comprehensive audit from a Notified Body representative once every year.
Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | |||||||||||||||||||||
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The Mid-West Instrument Model’s 845-5, 845-3 and 845-2 have been added to both the FCCC & HR-USC and CA-NV AWWA list of Acceptable Gauges. The 845’s join the 830 on the list. For the past 30 years Mid-West Instrument has been producing Quality Backflow Test Kits. Our Model 830 has been the benchmark of the industry for decades. Constant input from field testers led to refinements such as inline filters, laminated test procedures, removable lids, soft seated needle valves & line pressure gauges. Further input testing and updated technology led to the portable Model 844. The culmination of all this development has resulted in Mid-West’s newest product offering, the Model 845. This new model features all the benefits you’ve come to expect from our kits and is available in 5-valve, 3-valve and 2-valve configurations. The addition of the Model 845 to our product lineup truly allows Mid-West to offer “A Test Kit for Every Preference”!
Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | ||||||||||||||||||||||||||||||||||||||||||
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The Model 150 “Vari-Damp®” all purpose pulsation dampener features both a fine thread needle valve for adjusting dampening characteristics and a Precision Controlled Flow Rate Ball Check to block line surges, shock waves, or fluid hammer. The Model 200 “Gauge Minder” features a pressure limiting valve that blocks off excess pressure to the instrument, preventing calibration failure, internal damage, and “blowout” from over-ranging - a principal cause of instrument failure.
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Mid-West Instrument Complete Catalog (PDF 23.8MB) Installation & Maintenance Manuals Available (Contact Us) | |
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Model 300 Inline Delta Tube Flow Element 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. |
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Model 301, 302, 303 Flow Element Insertion-Type Sensors 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. |
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Model 306, 307, 308 Delta Air or Delta Duct Insert-Type Flow Element Sensors 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. |
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Model 311, 312, 321, 322, 323, 331, 332 Delta Tap Insertion-Type Flow Elements 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. |
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Model 341 thru 391, 342 thru 392, and 343 thru 393 Delta Tube Flanged Flow Elements 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. |
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Delta Tubes and Delta Taps 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. |
