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MIDWEST INSTRUMENT

Midwest Instrument is a manufacturer of differential pressure instrumentation, including gauges, indicators, and switches. The company's product line is organized into series such as 120, 130, 140, 142, and 522, each targeting specific pressure ranges and media compatibility. These instruments are used to measure the difference in pressure between two points in fluid or gas systems, a critical function in filtration, flow measurement, and leak detection. The Series 120 and 140 are designed for medium and high operating pressures, with piston or diaphragm sensors and housing materials including aluminum, 316 stainless steel, and glass-reinforced plastic. The Series 522 differential pressure indicator with switch offers a Buna-N sensor and Acetal plastic housing, with color-coded transition points for visual monitoring. Accuracy for these devices is typically ±3-2-3% or ±5% of full scale, depending on the model. Many units carry IP65 ratings, indicating protection against dust and water ingress. They also conform to standards such as ASME B1.20.1, ASME B40.100, CSA-C22.2 No. 14, EN-61010-1, NEMA Std. 250, and UL Std. No. 50 and 508. Connections are commonly 1/4 in NPT female, with dial sizes ranging from 2 1/2 in to 4 1/2 in. 3G Electric supplies Midwest Instrument differential pressure gauges, indicators, and switches to industrial buyers worldwide. The product range includes models with integrated switches for alarm or control functions, as well as basic indicators. These instruments are used in applications such as monitoring filter differential pressure, verifying pump performance, and ensuring proper flow in process lines. 3G Electric supports the line by providing access to the full catalog, technical specifications, and logistics coordination for global delivery. The company serves plant engineers, maintenance managers, and procurement specialists who require reliable pressure measurement solutions. With a focus on technical accuracy and material compatibility, Midwest Instrument products are suited for demanding environments in industries such as oil and gas, chemical processing, water treatment, and power generation. 3G Electric's role is to facilitate the procurement of these instruments, ensuring that buyers can specify the correct model for their pressure range, media, and connection requirements. The product data includes detailed specifications, standards, and part numbers to aid in selection. For those needing differential pressure measurement with switch capability, models like the 522P-015-LA provide a compact solution with visual indication. For higher pressure applications, the Series 120 and 140 offer robust construction and higher accuracy. Overall, Midwest Instrument provides a range of differential pressure instruments that 3G Electric makes available to a global customer base.

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About MIDWEST INSTRUMENT

Midwest Instrument is a manufacturer of differential pressure instrumentation, including gauges, indicators, and switches. The company's product line is organized into series such as 120, 130, 140, 142, and 522, each targeting specific pressure ranges and media compatibility. These instruments are used to measure the difference in pressure between two points in fluid or gas systems, a critical function in filtration, flow measurement, and leak detection. The Series 120 and 140 are designed for medium and high operating pressures, with piston or diaphragm sensors and housing materials including aluminum, 316 stainless steel, and glass-reinforced plastic. The Series 522 differential pressure indicator with switch offers a Buna-N sensor and Acetal plastic housing, with color-coded transition points for visual monitoring. Accuracy for these devices is typically ±3-2-3% or ±5% of full scale, depending on the model. Many units carry IP65 ratings, indicating protection against dust and water ingress. They also conform to standards such as ASME B1.20.1, ASME B40.100, CSA-C22.2 No. 14, EN-61010-1, NEMA Std. 250, and UL Std. No. 50 and 508. Connections are commonly 1/4 in NPT female, with dial sizes ranging from 2 1/2 in to 4 1/2 in. 3G Electric supplies Midwest Instrument differential pressure gauges, indicators, and switches to industrial buyers worldwide. The product range includes models with integrated switches for alarm or control functions, as well as basic indicators. These instruments are used in applications such as monitoring filter differential pressure, verifying pump performance, and ensuring proper flow in process lines. 3G Electric supports the line by providing access to the full catalog, technical specifications, and logistics coordination for global delivery. The company serves plant engineers, maintenance managers, and procurement specialists who require reliable pressure measurement solutions. With a focus on technical accuracy and material compatibility, Midwest Instrument products are suited for demanding environments in industries such as oil and gas, chemical processing, water treatment, and power generation. 3G Electric's role is to facilitate the procurement of these instruments, ensuring that buyers can specify the correct model for their pressure range, media, and connection requirements. The product data includes detailed specifications, standards, and part numbers to aid in selection. For those needing differential pressure measurement with switch capability, models like the 522P-015-LA provide a compact solution with visual indication. For higher pressure applications, the Series 120 and 140 offer robust construction and higher accuracy. Overall, Midwest Instrument provides a range of differential pressure instruments that 3G Electric makes available to a global customer base.

Common Applications

  • Oil and gas processing — Series 120 differential pressure gauges with piston sensors for high-pressure filter monitoring
  • Chemical processing — Series 140 differential pressure gauges with 316 stainless steel housing for corrosive media
  • Water treatment — Series 130 differential pressure gauges with glass-reinforced plastic housing for pump differential pressure
  • HVAC and building automation — 522P-015-LA differential pressure indicator with switch for filter status monitoring
  • Power generation — Series 142 differential pressure gauges with diaphragm sensors for flow measurement in cooling systems
  • Pharmaceutical manufacturing — Midwest Instrument differential pressure gauges with 316 stainless steel wetted parts for clean processes

Guides & Resources

Frequently asked questions

Common questions about MIDWEST INSTRUMENT from 3G Electric.

What is the difference between the Midwest Instrument Series 120 and Series 140 differential pressure gauges?

The Series 120 and Series 140 are both designed for medium and high operating pressures, but they differ in sensor type and housing materials. Series 120 models typically use a piston sensor and may have aluminum or 316 stainless steel housings. Series 140 models use a diaphragm sensor and are often constructed with 316 stainless steel housings. Both offer ±3-2-3% gauge accuracy and 1/4 in NPT female connections. The choice depends on the specific pressure range, media compatibility, and environmental conditions. Series 120 piston sensors are generally suited for higher pressure ranges, while Series 140 diaphragm sensors may be preferred for lower differential pressures or where a diaphragm seal is beneficial.

What are the color-coded transition points on the Midwest Instrument 522P-015-LA differential pressure indicator?

The 522P-015-LA features color-coded transition points to provide visual indication of differential pressure status. The green zone indicates 0 to 7.5 psid, which typically represents a normal or acceptable differential pressure. The yellow zone indicates a warning range, and the red zone indicates an alarm or high differential pressure condition. These color codes help operators quickly assess filter condition or flow status without needing to read a numerical value. The indicator also includes a switch that can be wired to alarms or control systems. The sensor is Buna-N and the housing is Acetal plastic, with an IP65 rating for protection against dust and water.

What standards do Midwest Instrument differential pressure gauges comply with?

Midwest Instrument differential pressure gauges and indicators comply with several industry standards, depending on the model. Commonly referenced standards include ASME B1.20.1 for pipe threads, ASME B40.100 for pressure gauges, CSA-C22.2 No. 14 for industrial control equipment, EN-61010-1 for safety requirements of electrical equipment, NEMA Std. 250 for enclosures, and UL Std. No. 50 and 508. Some models are also CE marked and RoHS compliant. These standards ensure that the instruments meet requirements for safety, performance, and environmental protection. For specific compliance details, refer to the individual product specifications. 3G Electric provides this information to assist in selecting the appropriate model for your application.

Can Midwest Instrument differential pressure gauges be used with both gas and liquid media?

Yes, Midwest Instrument differential pressure gauges are designed to measure pressure differences in both fluid and gas systems. The compatibility with specific media depends on the wetted materials of the sensor and housing. For example, models with Buna-N sensors are suitable for many oils, water, and air, but may not be compatible with certain solvents or aggressive chemicals. Models with 316 stainless steel housings and diaphragms offer broader chemical resistance. It is important to verify that the wetted materials are compatible with the process media. The product specifications list the sensor type and housing material, which can be used to assess compatibility. 3G Electric can provide additional details on request.

What is the accuracy of Midwest Instrument Series 130 differential pressure gauges?

Midwest Instrument Series 130 differential pressure gauges have a gauge accuracy of ±3-2-3% of full scale. This means the accuracy is ±3% for the first quarter of the scale, ±2% for the middle half, and ±3% for the last quarter. This accuracy specification is common for differential pressure gauges and provides reliable measurement across the range. The Series 130 features a diaphragm sensor and a glass-reinforced plastic housing, with 1/4 in NPT female back connections. It is suitable for medium and high operating pressures. The IP65 rating ensures protection against dust and water ingress. For precise application requirements, consult the product datasheet or contact 3G Electric for assistance.

Does 3G Electric supply MIDWEST INSTRUMENT products?

Yes — 3G Electric (S) Pte. Ltd. supplies MIDWEST INSTRUMENT products. We stock the MIDWEST INSTRUMENT catalog and supply genuine factory-original products with full manufacturer warranty and technical support.