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MPL 9391 Series


MPL / Switches & Sensors 9391 Series /
Low Pressure Switch

The MPL 9391 series is an ultra-low pressure, high accuracy semiconductor-based transducer affording a precision ratiometric output stable over temperature and time. Ideal for digital combustion control and high-performance applications. Differential or vacuum-only models available. Standard models available from 0-1 to 0-10 inH2O with a configurable 5VDC ratiometric output.


The MPL 9391 is ideal for new high-efficiency heating applications requiring feedback for intelligent controllers, ECM motors, logic-controlled blowers and other smart components for modulating furnace control applications. This may include blower vacuum, combustion air modulation, liquid level and many other applications.


Applications Include:

  • Air Flow Monitoring
  • Blower Modulation
  • Process Controls
  • Automation & Medical



  • Pressure type: Differential / Vacuum
  • Pressure range vacuum: 1, 2, 4, 6, 8 in H2O
  • Pressure range differential: +/- 2.5 inH2O
  • Proof pressure: 3 PSI
  • Burst pressure: 5 PSI



  • Supply voltage: 5, 12 VDC
  • Supply current (max): 1.5 mA
  • Output signal: Ratiometric
  • Full scale: 4.00v or 4.5v (typical)
  • Zero / Null pressure: 0.25v or 0.50v (typical)


Performance at 25°C

  • Accuracy: +/- 1.5% of full scale

Accuracy specifications apply over operating conditions. This specification represents the total combination of non-linearity, hysteresis, zero and span shift, repeatability and temperature effects.



  • Compensated temperature range: 0°C to 60°C
  • Storage temperature: -40°C to +95°C
  • Media: Air, non-corrosive, non-ionic
  • Humidity: 95% RH



  • Housing material: Glass filled PBT polyester or equivalent
  • Electrical termination: Connectory Tyco 172234-1
  • Electrical termination: 3x wire terminal Tyco 770985-1
  • Terminal pins material: Phosphor bronze tinned
  • Weight: 10 grams



  • CSA certificate: 2508694

Features & Benefits

  • Customer Engineered Solutions
  • Port Configurable
  • Extreme Low Pressure
  • Historically Proven Reliability
  • Programmable Offset and Span

Custom OEM Solutions

Product design and customization has been a core service at Micro for over 50 years. With broad multi-industry experience, Micro is tested and trusted by the world’s most experienced and demanding OEMs
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