Hazardous Locations Differential Pressure Gauges

The Mid-West Instrument experience: Proven Product for you.

  • Over 30 Years of proven design in the field for use in Hazardous locations
  • CSA, UL, KOSHA, IECEx Certifications
  • LVD RoHS Compliant
  • Certifications apply to the entire assy. as mandated by Hazardous Location Stds.
  • 3-4 Unannounced inspections by CSA and UL per year
  • Yearly ATEX and KOSHA audits
  • See individual models for complete specifications

Hazardous Location Quick Reference Guide

Hazardous Location Switch/Transmitter Description:

Mid-West Instrument has been designing and manufacturing differential pressure switches for use in Hazardous Locations for over 30 years. Our products may carry one or more  certifications from CSA, UL, ATEX, or KOSHA.  Products CE marked for compliance to the ATEX directive are also compliant to the RoHS Directive.  Hazardous Locations certifications  apply to the entire assembly / design and not just the use of a “Certified Enclosure”.  Certifications are product specific so please verify your certification requirements with one of our knowledgeable Mid-West Sales Coordinators. In order to mark our product with the CSA & UL marks, Mid-West Instrument is subject to unannounced visits by personnel from each certification lab 3-4 times per year. In addition, for the ATEX and KOSHA certification we are subject to a comprehensive audit from a Notified Body representative once every year. See individual models for complete specifications.


OEM, Private Label, Special Dials:

Mid-West Instrument has the capability to design and engineer a Differential Pressure Gauge, Switch or Transmitter to the exact requirements of the customer. Dial size, Process connection Size and location, etc. can also be customized to the customer’s requirements. Mid-West has one of  the fastest production times in the Industry. Our standard production time on most gauges is 7-10 business days or less.

Mid-West Instrument has the equipment and printing technology to provide color dials, flow scales and customer logo dials.

Please contact your Sales Coordinator for additional information and terms.

“Piston Type” Hazardous Locations Product

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 120 0-5 PSID to 0-110 PSID ±3/2/3% Up to 6,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Flying Leads / DIN Connector, Class 1-Div. 1, Class 1-Div. 2
Model 121 0-5 PSID to 0-100 PSID ±3/2/3% Up to 6,000 PSI CE / LVD, RoHS Compliant, NEMA 4X,Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter N/A
Model 220 0-5 PSID to 0-100 PSID ±3/2/3% Up to 4,000 PSI CE / ATEX / RoHS Compliant, KOSHA CERTIFIED, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A

“Diaphragm Type” Hazardous Locations Product

Model No. Differential Pressure Range Accuracy Working Pressure Electrical Available Specifications Installation/ Operation Manual Electrical IOM Drawing
Model 130 0-5" H2O to 0-15 PSID (0-400" H2O) 0-5" H2O to 0-9.9" H2O
±5%
0-10" H2O to 0-15 PSID
±3/2/3%
Up to 500 PSI CE / LVD, RoHS Compliant, NEMA 4X, Class 1-Div. 1
Model 140 0-50" H2O to 0-100 PSID 0-50" H2O to 0-399" H2O
±5%
0-15 PSID to 0-100 PSID
±3/2/3%
Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A
Model 142 0-20" H2O to 0-25 PSID ±3/2/3% Up to 3,000 PSI CE / LVD, RoHS Compliant, NEMA 4X, Terminal Strip, Class 1-Div. 2, 4-20mA Transmitter
Model 240 0-20" H2O to 0-100 PSID ±3/2/3% Up to 1500 PSI CE / ATEX / RoHS Compliant CSA, UL & KOSHA CERTIFIED, NEMA 4X, Terminal Strip, Class 1-Div. 1, Class 1-Div. 2, 4-20mA Transmitter N/A
Download Your
Mid-West Instrument Catalog