Mid-West Instrument

What Mid-West Instrument does

Mid-West Instrument, founded in 1958 and headquartered in Sterling Heights, Michigan, is a privately held US manufacturer specializing in differential pressure gauges, switches, and transmitters for industrial applications. Its product portfolio spans four core sensing mechanisms — bellows (Models 105, 106, 115, 116, 114), Bourdon tube (Model 109), piston (Models 120-124, 220), and diaphragm (Models 130, 140, 142, 522, 555, 240) — with accuracy ratings from ±0.5% to ±5% full scale and working pressures up to 10,000 PSI. Differentiated technology centers on a proprietary magnetic movement that isolates the gauge function from the pressure chamber without mechanical seals, bi-directional over-pressure protection, and microprocessor-based 4-20mA loop-powered transmitters using individually calibrated magnetic angle sensors.

Name

Mid-West Instrument

Legal name

Mid-West Instrument

Website

https://midwestinstrument.com

Company type

Private

Founded year

1958

Operating status

Operating

Headcount range

11–50 employees

Short description

Mid-West Instrument is a US-based industrial manufacturer (founded 1958) of differential pressure gauges, switches, and transmitters serving industrial, energy, water/wastewater, hazardous-location, and OEM customers globally.

Ownership category

akta.pro rank

Product category

Industrial Differential Pressure Measurement Instruments

NAICS

Other Measuring and Controlling Device Manufacturing (334519), Navigational, Measuring, Electromedical, and Control Instruments Manufacturing (33451)

SIC

Industrial Instruments For Measurement, Display, And Control (3823), Measuring & Controlling Devices, Nec (3829)

akta.pro primary industry

Industrial Sensors (Pressure, Temperature, Flow, Level, Proximity, Vibration) (IMAGAFAA)

akta.pro secondary industry

Pressure & Force Sensors (Pressure/Strain/Load Cells) (HDAHALAB)

Keywords

• Differential pressure gauges
• Differential pressure switches
• Differential pressure transmitters
• Industrial pressure measurement
• Hazardous location instruments

Headquarters

HQ city

Sterling Heights

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Technology or R&D, Others, Marketing or Sales, Infrastructure

Revenue model

1. Differential Pressure Gauge Sales: Sale of differential pressure gauges including bellows type (Models 105, 106, 115, 116), bourdon tube type (Model 109), piston type (Models 120-124, 220), and diaphragm type (Models 130, 140, 142, 522, 555) instruments. Products sold with various accuracy ratings from 0.5% to 5% full scale and working pressures up to 10,000 PSI.
2. Differential Pressure Switch Sales: Sale of differential pressure switches with reed switches or relays available in SPDT and SPST configurations. Switches are adjustable within defined percentage of full scale range and can be set to activate on rising or falling pressure. Hazardous location certified switches available.
3. Differential Pressure Transmitter Sales: Sale of microprocessor-based differential pressure transmitters providing 4-20 mA output for remote location monitoring. Proprietary magnetic sensors convert gauge movements into electric signals while maintaining local station readout capability.
4. OEM Custom Products: Customized differential pressure gauges, switches, and transmitters designed to OEM customer exact specifications including dial size, process connection size/location, and special dial printing with color dials, flow scales, and customer logos.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

Mid-West Instrument designs and manufactures differential pressure gauges, switches, and transmitters for industrial measurement applications. The product line uses bellows, Bourdon tube, piston, and diaphragm sensing mechanisms with proprietary magnetic movement technology that isolates pressure measurement without mechanical seals. Offerings include high-accuracy (±0.5–1%) and standard-accuracy (±2–5%) instruments, OEM-customizable indicators, hazardous-location-certified variants, and 4–20 mA loop-powered transmitters for remote monitoring.

Product overview

Mid-West Instrument manufactures a comprehensive portfolio of differential pressure gauges, switches, and transmitters for industrial applications. The product line centers on three core sensing technologies: bellows-type (high accuracy, ±0.5-1% models 105, 106, 115, 116), Bourdon tube-type (high accuracy, ±0.5-1% model 109), and piston-type (standard accuracy ±3/2/3-5% models 120-124, 220), and diaphragm-type (standard accuracy ±3/2/3-5% models 114, 130, 140, 142, 240). Tank level gauges (models 114, 115, 116) serve cryogenic and industrial gas applications. Hazardous location-certified products (models 120/121/130/140/142 Div 1 and Div 2, 220, 240) carry CSA, UL, ATEX, and IECEx certifications. OEM indicators (models 126, 127, 146, 444, 522, 555) provide cost-effective solutions for filter monitoring. Supporting accessories include pitot tubes (Model 300), pulsation dampeners (Model 150), pressure limiting valves (Model 200), and stainless steel manifolds. The product line also includes 4-20mA transmitters for remote monitoring and integrates hermetically sealed reed switches for alarm and control functions.

Differentiator

Problem solved

Functional benefit

Brands

• Mid-West®: Registered trademark brand name used for differential pressure gauges, switches, and transmitters.

Products and services

• Model 105 Differential Pressure Gauge High-accuracy bellows-type differential pressure gauge for low DP applications with ±0.5% or ±1.0% full-scale accuracy, ranges from 0-10" H2O to 0-79.9" H2O, and working pressures up to 3,000 PSI.
• Model 106 Differential Pressure Gauge Bellows differential pressure gauge with optional integrated micro-switches for remote monitoring and control, ±0.5% or ±1.0% accuracy, and ranges from 0-80" H2O to 0-800" H2O.
• Model 109 Differential Pressure Gauge High-accuracy Bourdon tube-type differential pressure gauge with ±0.5% or ±1% full-scale accuracy, designed for leak detection and low volume pressure systems with ranges from 0-15 PSID to 0-6,000 PSID.
• Model 115 Differential Pressure Gauge Tank level bellows-type differential pressure gauge with ±1% full-scale accuracy, bi-directional over-pressure protection, and ranges from 0-10" H2O to 0-69.9" H2O for closed tank liquid level monitoring.
• Model 116 Differential Pressure Gauge Tank level bellows-type differential pressure gauge with optional micro-switches, ±1% full-scale accuracy, and ranges from 0-70" H2O to 0-800" H2O for cryogenic and liquefied gas applications.
• Model 120 Differential Pressure Gauge Versatile piston-type differential pressure gauge with ±3/2/3% accuracy, ranges from 0-5 PSID to 0-110 PSID, multiple switch options including hazardous location configurations, and working pressures up to 6,000 PSI.
• Model 121 Differential Pressure Gauge / Transmitter Piston-type differential pressure gauge with terminal strip interface and optional 4-20 mA transmitter, ±3/2/3% accuracy, and ranges from 0-5 PSID to 0-100 PSID.
• Model 122 Differential Pressure Gauge Entry-level piston-type differential pressure gauge with ±5% accuracy, ranges from 0-5 PSID to 0-110 PSID, for cost-effective filter and strainer monitoring applications.
• Model 123 Differential Pressure Gauge High differential pressure piston-type gauge with ranges from 0-150 PSID to 0-400 PSID, ±3/2/3% accuracy, and working pressures up to 5,000 PSI for hydraulic applications.
• Model 124 Differential Pressure Gauge High-pressure piston-type differential pressure gauge with terminal strip switch and transmitter options, ranges from 0-5 PSID to 0-400 PSID, and working pressures up to 10,000 PSI.
• Model 140 Differential Pressure Gauge Convoluted diaphragm-type differential pressure gauge with terminal strip interface, ±5% or ±3/2/3% accuracy depending on range, ranges from 0-50" H2O to 0-100 PSID, with optional hazardous-location configurations.
• Model 142 Differential Pressure Gauge Low-cost diaphragm-type differential pressure gauge with ±3/2/3% accuracy, ranges from 0-20" H2O to 0-25 PSID, terminal strip interface, and Class I Div 2 hazardous-location options.
• Model 522C Differential Pressure Indicator Rolling diaphragm-type tri-color differential pressure indicator with Clean/Change/Dirty color bands for filter monitoring, ±5% accuracy, and ranges from 0-5 PSID to 0-50 PSID.
• Model 555A Differential Pressure Indicator Tri-color diaphragm-type differential pressure indicator for filter status visualization, ±5% accuracy, ranges from 0-3.5 PSID to 0-43 PSID, with two-sided dial display.
• Model 114 Tank Level Differential Pressure Gauge / Transmitter High-sensitivity diaphragm-type tank level differential pressure gauge with ±2% descending accuracy, hermetically sealed reed switch options, and ranges from 0-20" H2O to 0-600" H2O.
• Model 220 Hazardous Location Differential Pressure Switch / Transmitter Hazardous location piston-type differential pressure switch certified for Class I Division 1/2 and Class II locations, with CSA, UL, ATEX, IECEx certifications, field-accessible terminal strip, and 4-20 mA transmitter options.
• Model 240 Hazardous Location Differential Pressure Switch / Transmitter Hazardous location diaphragm-type differential pressure switch with ATEX, CSA, UL certifications, terminal strip interface, and 4-20 mA transmitter output for explosive environments.
• Model 120 Div 1 Explosion-Proof Differential Pressure Switch Explosion-proof piston-type differential pressure switch for Class I Division 1, Groups C & D and Class II Division 1, Groups E, F & G hazardous locations, with CSA and UL certifications.
• Model 130 Div 1 Explosion-Proof Differential Pressure Switch Explosion-proof diaphragm-type differential pressure switch for Class I Division 1, Groups C & D hazardous locations, with aluminum electrical enclosure and color-coded leads.
• Model 140 Div 1 Explosion-Proof Differential Pressure Switch Explosion-proof diaphragm-type differential pressure switch for Class I and II Division 1 hazardous locations with CSA and UL certifications, aluminum enclosure, and 1/2" FNPT conduit connection.
• Model 120 Div 2 Weather-Proof Differential Pressure Switch Weather-proof piston-type differential pressure switch for Class I and II Division 2 hazardous locations, NEMA 4X rated enclosure, lower cost alternative to explosion-proof designs.
• Model 121 Div 2 Differential Pressure Switch / Transmitter Division 2 hazardous-location differential pressure switch/transmitter with field-wireable terminal strip that eliminates the need for a separate junction box, with NEMA 4X weatherproof enclosure.
• Model 140/142 Div 2 Differential Pressure Switches Weather-proof diaphragm-type differential pressure switches for Division 2 hazardous locations with field-wireable terminal strip and aluminum NEMA 4X enclosure.
• Model 126 OEM Differential Pressure Indicator OEM entry-level piston-type differential pressure indicator with ±5% accuracy, ranges from 0-5 PSID to 0-20 PSID, and clamp-on and flat-pack switch options for filter and strainer monitoring.
• Model 127 OEM Differential Pressure Indicator OEM piston-type differential pressure indicator for higher pressure ranges from 0-25 PSID to 0-100 PSID with ±5% accuracy, with clamp-on and flat-pack switch options.
• Model 146 OEM Differential Pressure Indicator OEM diaphragm-type differential pressure indicator with ±5% accuracy, ranges from 0-5 PSID to 0-30 PSID, with plug-in DIN and flying lead switch options.
• Model 444 OEM Differential Pressure Indicator Compact OEM differential pressure indicator with green/red sliding indication for filter monitoring, ranges from 0-5 PSID to 0-25 PSID, designed as a cost-effective alternative to full DP gauges.
• Model 300 In-Line Averaging Pitot Tube In-line averaging pitot tube for flow measurement applications, part of the Flow Measurement Application Models product line.
• Model 150 Pulsation Dampeners Pulsation dampeners designed to reduce pressure fluctuations in differential pressure measurement systems.
• Model 200 Pressure Limiting Valves Pressure limiting valves for protecting differential pressure gauges from over-pressure conditions.
• Stainless Steel Manifolds (3 & 5 Valve) Stainless steel manifolds available in 3-valve and 5-valve configurations for differential pressure gauge installations.
• Diaphragm Seals Diaphragm seals used as differential pressure gauge accessories for isolating instruments from process media.
• 4-20 mA Loop-Powered Differential Pressure Transmitters 2-wire loop-powered microprocessor-based 4-20 mA transmitters using magnetic angle sensor technology, individually calibrated with an 11-point calibration linearization technique. Available on Models 114, 121, 124, 220, 240, 140, and 142 for remote-location monitoring while preserving local station readout.
• Differential Pressure Switch & Relay Differential pressure switches with reed switches or relays available in SPDT and SPST configurations, adjustable within defined percentage of full-scale range, and able to be set to activate on rising or falling pressure for alarms, equipment activation, or system shutdowns; hazardous-location certified options available.
• OEM Custom Differential Pressure Products Custom-designed differential pressure gauges, switches, and transmitters manufactured exclusively for OEM customers to their exact specifications, including dial size, process connection size and location, and special dial printing with color dials, flow scales, and customer logos; minimum 25-piece orders.
• Precision Flow Test Kits Precision flow test kits for backflow prevention testing, distributed through Mid-West Instrument's Backflow Test Kits distributors and service centers via backflowtestkits.com.

Quantifiable outcome

• Differential pressure indication even with high line working pressures
• +1 more outcomes

Segments5 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators4 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Orange Research: Specialty manufacturer of differential pressure gauges, switches, and indicators for industrial applications; directly competes with Mid-West Instrument in the same product category with overlapping customer base in process industries and OEMs.
• NOSHOK: Manufacturer of pressure, level, and temperature measurement instruments including differential pressure gauges and switches; directly competes with Mid-West Instrument in industrial pressure instrumentation across similar OEM and end-user channels.
• REOTEMP Instruments: Specialty manufacturer of pressure and temperature instruments including differential pressure gauges for industrial and OEM markets; directly competes with Mid-West in the same niche with comparable sensing technologies and customer profiles.

Broad incumbents

• WIKA Instrument: Global leader in industrial measurement technology with a broad portfolio including differential pressure gauges, transmitters, and switches; competes as a much larger incumbent offering broader instrumentation, global service, and deeper catalog coverage than Mid-West.
• Ashcroft: Specialist in pressure and temperature measurement instruments serving process industries with direct overlap in differential pressure gauges; competes as a mid-size incumbent with broader product breadth and longer brand history.
• Emerson (Rosemount): Global automation giant whose Rosemount brand dominates differential pressure transmitters and pressure instrumentation; competes as a much larger incumbent with substantially deeper R&D resources and broader automation portfolio.
• Honeywell Process Solutions: Process automation incumbent offering pressure and differential pressure instrumentation as part of broader control systems and analytics platforms; competes as a much larger, diversified automation vendor with global account coverage.
• Yokogawa Electric: Process automation incumbent with differential pressure transmitters and field instrumentation in its portfolio; competes as a global automation vendor with substantially larger R&D resources and integrated control-system offerings.
• Ametek (Measurement & Calibration): Industrial conglomerate with measurement and process instrumentation businesses including pressure gauges and calibration equipment; competes as a large diversified incumbent with broader resources and channel reach.
• Watts Water Technologies: Water technology company focused on backflow prevention and water safety; overlaps with Mid-West's backflow test kit business as a much larger, broader incumbent in water-infrastructure markets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/140426899326540
• LinkedInlinkedin.com/company/mid-west-instrument

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Mid-West Instrument