Mid-West Instrument
Mid-West Instrument
About Mid-West®Instrument
Mid-West® Instrument was founded based on innovation back in 1958. At that time a customer approached Mid-West® Instrument with the need for monitoring pressure drop across a filter. The founders, a group of engineers, developed the model 120 differential pressure gauge. It was then a heritage of working with customers to solve their application needs was born. A second customer approached Mid-West® Instrument with the need for a leak detection gauge, the founders again developed a solution with the model 109 which was based on differential pressure. At this point Mid-West Instrument set out to find more customers with applications that required solutions.
Over the years the product line expanded and as applications warranted, the materials of construction expanded. Applications included all manner of monitoring pressure drop across filters from compressed air, water, lube oil, fuel oil to Natural Gas. Applications for simple indicators rather than differential pressure gauges led to a line of differential pressure indicators for direct mount onto filters rather than through instrument tubing. Complicated applications such as indicating flow from pressure drop across orifice plates, venturis and averaging pitot tubes as well as Liquid level indication were addressed and solutions were created. Hydronic balancing applications and the testing of backflow prevention assemblies led to the design and development of Portable Differential Pressure Instrument Test Kits.
The addition of alarm switches and transmitters to the product line led to the development of switch and transmitter designs to meet the needs of hazardous locations and explosion risk areas which bear national and international certification marks from CSA, UL, ATEX, IECEx, and/or KOSHA.
The Mid-West® Instrument team is ready to serve and address any application you may have.
Mid-West® Instrument develops proprietary designs that are manufactured exclusively for Original Equipment Manufacturers. Mid-West® Instrument differential pressure gauge, switch, or transmitter can be customized to the customer’s exact specifications.
As we have grown so has our Global presence. You will find Mid-West® Instrument differential pressure gauges, switches and transmitters in use on every continent!
Our facilities are climate-controlled state of the art factory complete with the latest CNC machine tool technology, test equipment, calibrations standards, Oxygen clean room and third party certified quality system. This allows us to maintain precise tolerances and product quality.
The team at Mid-West® Instrument is supported in the heritage of innovation by not only creatively solving application issues for customers, we constantly innovate inside the company to improve quality, processes, and efficiencies. This has led to our industry best lead times for both standard and customized products.
The entire team at Mid-West® Instrument is focused on customer service. Mid-West® is focused getting the right product, shipped on time, when promised, and as ordered. Our core values for both customers and employees is to tell you the truth, not just what you want to hear.”
Our employees understand and apply “Our Core Values” daily which lead to superior customer service.
The Mid-West® Instrument team is ready to serve and address any application you may have.
Applications
Catalytic Reduction
Regulate Ammonia Flow The Selective Catalytic Reduction (SCR) system pictured shows that the model 130 is being used to regulate the flow of ammonia into the system. Typically anhydrous ammonia or aqueous ammonia is added as a reducing agent to aid in the converision of Nitrogen Oxides into diatomic nitrogen and water.
Pressure Monitoring
A differential pressure gauge / switch / transmitter can help identify pump issues. Issues such as too high or low suction or discharge pressures can be caused by cavitation, loss of flow, mechanical failure, vibration, and bearing wear. While a switch can provide a warning for a defined pressure point, a 4-20ma transmitter in combination with a […]
Liquid tank level measurement
Diaphragm and Bellows type instruments can be used as liquid level indicators. With the high pressure port connected to a tap at the bottom of a tank and the low port kept open to atmosphere as shown, a differential pressure instrument can be used to measure liquid level as a function of head. Desired units (mm., […]
Cryogenic tank level measurement
Diaphragm and Bellows type differential pressure instruments calibrated in weight or volume are effectively used in cryogenic tank level monitoring. Tanks can be stationery ( vertical or horizontal) or they can be used in tanker transport vehicles. Most cryogenic instrumentation utilizes a “dry gauge” design where there is no internal liquid fill. This prevents any leaking […]
Reverse flow detection
Reverse flow rate can be detected with the use of a differential pressure instrument. (Cost effective way to detect reverse flow) Reverse flow condition can be detected with the use of a differential pressure instrument. When differential pressure is measured across a restriction in the flow line , we can measure flow rate. In applications […]
Flow rate monitoring and control
Flow rate can be controlled using valves with the assistance of the gauge. Flow rate adjustment is done with the help of valves in pipelines. Diaphragm type differential pressure instruments selected as per service and range are used to control the flow rates. These gauges are also available with glycerin filled indicators to limit pointer […]
Backflow prevention
Used to test system differential pressure and to check assemblies used in back flow prevention. Diaphragm type instruments Model 845-5 and 835 with bottom and vent connection are used for testing system differential pressure and checking assemblies used for back flow prevention. Backflow Test kits are also available in 2 and 3 valve models. Learn […]
Strainer Monitoring
Used to monitor pressure drops across strainers in petroleum/ chemical industry. Differential pressure instruments are used to monitor pressure drop across strainers used in line with positive displacement flow meters. Petroleum oil companies and chemical plants use positive displacement flow meters to measure volume. Contaminated fluids can damage these expensive and critical flow meters. Strainers […]
Self Cleaning Filter
Used to monitor clogging of filter A Piston or diaphragm type indicating differential pressure gauge with a switch are ideal for monitoring filter conditions. An adjustable switch can initiate a cleaning cycle to self-clean / backwash a filter automatically at a preset differential pressure.
Natural Gas Filtration
Recommended in the natural gas industry for applications with a greater presence of dirt particles For greater amount of dirt particles, diaphragm instruments are recommended. Models 140, 142 and 240 are convoluted elastomer diaphragms. Red Maximum follower pointer is a popular option.
HVAC Systems
Differential Pressure Gauge with a switch is set to signal an alarm at a preset value of pressure differential.Diaphragm type differential pressure instruments are used on heat exchangers to measure pressure differential in a transformer oil cooling system. The oil passing through the heat exchanger is kept at a higher pressure than the water that […]
Irrigation Filtration
Monitor filter clogging in the irrigation industry. Water from canals is filtered before it is used for irrigation. The Mid-West Instrument Model 146 Indicating Switch detects when the filter is clogged and provides a switch output. Once the switch has been activated, a back flush starts which helps remove and drain the sediments from the […]
Filter Monitoring
Air and collector bag filter Monitor filter clogging in the clean air industry. In pharmaceutical, food and chemical processes, small batches of compounds are to be dried. Dryers specially made for this purpose use hot dry air. Air is sucked from the room through filters and blown over heater coils. The blower forces this hot […]
