M Series Dia-Vac® Pumps

The M Series Dia-Vac® Pumps hit the sweet spot between flow, vacuum, pressure and corrosion resistance.

Engineers across the U.S. and Canada rely on this mid-range line when piston or vane pumps add contamination riskBrowse the models below, then scroll on for application notes, troubleshooting tips, and links to Dia-Vac® pump replacement parts that keep your system running for decades.

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What Are M Series Dia-Vac® Pumps?

Diaphragm pumps move gas by flexing a PTFE-coated membrane against check valves, creating a sealed vacuum chamber with zero contamination of the gas. The M Series shares that DNA with every Dia-Vac® family, but it’s purpose-built for moderate flow rates (up to 18 L/min) and stable vacuum down to 350 mbarA. Compared with the larger capacity R Series M Series units offer a lighter footprint, simplified wiring, and broad chemical

Typical duty cycles include:

  • Emissions-stack monitoring on CEMS
  • Ambient-air sampling in environmental field studies

Key Features & Benefits of the M Series

Engineers choose the M Series when uptime, clean gas paths, and flexible mounting options outweigh absolute flow numbers. Below, a closer look at what sets these industrial diaphragm vacuum pumps apart.

Moderate Vacuum Performance

The twin-head diaphragm design pulls to 80 mbar while maintaining low pulsation—ideal for analyzers that hate pressure spikes.

Compact, Field-Ready Design

Chemical-Resistant Materials

Select PTFE-wetted heads for aggressive acid gases; choose 316 SS or anodized aluminum when solvent compatibility and budget balance out.

Oil-Free, Low-Maintenance Operation

With no sliding seals to lubricate, the M Series slashes PM time. Annual diaphragm inspections usually suffice; replacements take <15 min with a basic hex key.

Multiple Configurations

Single and Double Head pumps available to meet your need for speed.

Replacement Parts & Repair Kits

All wearable items—diaphragm,valve discs, valve gasket, and Tefon washer —ship as kits so maintenance crews can rebuild pumps onsite without factory calibration. Every kit includes:

Diaphragm (2) Teflon Valve discs Teflon valve gasket Teflon sealing washer Need bulk spares for multi-unit fleets? Volume pricing starts at five kits.

Explore OEM Diaphragm Replacement Parts

Troubleshooting & Maintenance Tips

  • Drop in flow? Check inlet filters first— If the diaphragm is intact, check the valve discs for buildup or debris.
  • High motor temperature? Verify ambient rating on motor to ensure it matches the environment.
  • Condensation inside head? Heat the pump head and mount so that the arrows on the pump head face down.

Frequently Asked Questions

They blend mid-range flow/vacuum with a smaller footprint than R Series pumps.

M Series Dia-Vac® pumps are typically used on Continuous Emissions Monitoring Systems (CEMS).

Yes—fully dry, PTFE-diaphragm operation eliminates contamination of the sample gas.

We recommend inspecting diaphragms every 8-12 months for a continuous application.

Is there a video on installation? Yes! Please visit here.

Ready to Specify Your M Series Dia-Vac® Pump?

Whether you’re upgrading a mobile emissions cart or designing a new gas sampling system , ADI Kits stocks every M Series configuration of the chemical-resistant vacuum pumps and spare parts to match. Our application engineers answer most sizing requests within one business day and ship in-stock units same week across the U.S. and Canada.

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Need high-flow alternatives? Explore our J Series Pumps or R Series High-Capacity Pumps for other performance envelopes.

NOTE – All of our Series Pumps are available with Heated Head configurations.