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Met One Instruments, Inc. offers selected weather sensors and handheld airborne particle and dust monitors to ensure HVAC systems work smoothly and efficiently. Our meteorological instruments measuring wind, temperature, relative humidity, and barometric pressure can help a smart system know when and how to operate. Met One Instruments, Inc.'s handheld devices, which utilize light scatter technology, are an affordable way to monitor suspended particulate in the system to help ensure it is running cleanly and efficiently. Data obtained from our particle counters and monitors can help determine when maintenance is needed—whether that be duct cleaning, a filter change, or other intervention.

Heating, air conditioning, and ventilation units and their ducts can be sources of mold, fungi, and other microbial pollutants, dust particles, secondary smoke, and other organic material. Testing and cleaning HVAC systems and ductwork is achieved through various methods. Typically, the "loosened" particulate matter is drawn throughout the HVAC systems, both before and after cleaning. Indoor air quality in an HVAC application can be quickly determined before and after the cleaning process with a particle counter. A particle counter is also used to assess equipment performance and aid in equipment inspection. Our handheld models 804 or GT-324, are particularly useful in HVAC applications.

HVAC Products:

  • ES-405

    ES-405 Simultaneous Particulate Profiler

    The ES-405 is a near reference air quality sensor designed to provide accurate real time measurements of PM10, PM4, PM2.5, and PM1 particulate concentrations simultaneously. This unit reports four key particulate concentrations in both indoor and outdoor environments. The rugged...

  • ES-412

    NEW ES-412 Portable Simultaneous Particulate Profiler

    Introducing the newest addition to Met One Instruments, Inc. line of Localized Particulate Monitors, the ES-412 Portable Simultaneous Particulate Profiler. As a Near-FEM (Federal Equivalent Method) product, the ES-412 provides the quality and day-to-day stability consistent with EPA quality objectives....

  • Benchtop Particle Counter BT-645

    Met One Instruments’ BT‐645 Benchtop Particle Counter has been designed to continuously measure and record particulate information for indoor work place and public space environments. Our BT-645 optical sensor, matched electronics and backlit display, are enclosed in a rugged metal...

  • The ES-642 Remote Dust Monitor

    Remote Dust Monitor ES-642

    Met One Instruments’ ES-642 Remote Dust Monitor is an industrial air-quality sensor designed to provide real time particle concentration measurements in both indoor and outdoor environments. Our ES-642 measures particulate concentration using a highly sensitive forward scatter laser nephelometer, which...

  • Aerocet 532 Handheld Particle Monitor

    Meet the newest addition to the Met One Instruments, Inc. lineup of handheld particle monitors: the Aerocet 532. This particle monitor has been optimized in functionality and ease of use with a 2.8″ TFT full-color LCD display, making accurate measurement...

  • GT-324 Handheld Particle Counter

    Met One Instruments, Inc.’s Model GT-324 particle counter is a full-featured handheld particle counter that provides the functionality of a bench unit in a portable package. A fully integrated RH/Temp sensor immediately provides data to your displayed and logged data....

  • Model 804 Handheld Particle Counter - Met One Instruments

    Handheld Particle Counter Model 804

    Met One Instruments’ 804 handheld particle counter is a 4-channel portable particle counter that counts particles 0.3 microns to 10.0 microns – giving you portability and reliability at very competitive pricing. Though compact, this unit is completely self-contained with its...

  • Aerocet 531S Handheld Particle Counter

    Aerocet 531S Handheld Particle Mass Profiler & Counter

    The Aerocet 531S is a full–featured, completely portable, battery operated, handheld mass monitor or particle counter. This unit provides particle counts or mass PM measurements as stored data logged values, real-time networked data, or printed results.

  • Aerocet 831 Handheld Particle Counter - Met One Instruments

    Aerocet 831 Handheld Aerosol Mass Monitor

    The Aerocet 831 is a completely portable, full–featured, battery operated, handheld mass monitor. This device simultaneously provides five critical mass ranges (PM1, PM2.5, PM4, PM10 & TSP) in one minute from start up. Survey the environment with the easy to...

  • Swift 6.0 Flow Meter

    The Swift 6.0 is a multi-function Flow Meter specifically designed for accurate low rate measurements. The device’s easy to read display shows Flow Rate, Flow Temperature and Ambient Pressure. Flow measurements are traceable to our NIST standard and Certification is...

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