Air Quality Meter

Series AFG Averaging Flow Grid Sensors

The Series AFG Flow Grid is an outstanding simple yet accurate cost effective alternative to other duct mounted pressure sensors. Once installed and connected to a suitable measuring instrument, the device will provide years of trouble free monitoring of both air and gas flow. Installing the AFG Flow Grid is quick and easy, the AFG is supplied in kit form to allow both workshop and on-site installation into a wide range of square and circular ducts up to approximately 60".

The AFG Flow Grid is a fundamental pressure sensing device designed to transmit a continuous differential pressure signal. When this output is connected to a suitable measuring instrument (i.e., manometer, pressure transducer, etc.), it may be used to determine air velocity and volume flow rate.

How the AFG Flow Grid Works
The AFG Flow Grid consists of two tubes mounted diagonally across a square or rectangular duct, or diametrically across a round duct. The tubes are drilled with a series of equi-spaced holes.

The holes in one tube face directly upstream and sense total pressure, while the pairs of holes in the second tube also face forward but at an included angle of 79 degrees, sensing static pressure. The total and (sub) static pressures are averaged along the length of each tube and provide pressure signals at connectors outside the duct wall. The pressure differentials across these connectors constitute the output signal.

Product Applications

The AFG Flow Grids will give useful and reliable readings in a wide variety of 'in duct' locations often where other flow rate measuring devices are found to be unsatisfactory. The signal from an AFG Flow Grid can be used in a variety of ways, for example:
To display differential pressure, velocity of volume flow using a micro manometer, gage or transmitter.To give a warning of over or under flow rate using a pressure switch.To control air supply in a system by connection the grid to a pressure transmitter with an electrical output which can be used to feed into a control system.To display differential pressure on a simple fluid manometer to give visual indication of changes in volume flow rate in the duct.

Series FAFM Fan Inlet Air Flow Measuring Probe

The Model FAFM Fan Inlet Air Flow Measuring Probes use evenly distributed total and static pressure measuring points to deliver an accurate measurement of flows in a fan inlet. The Air Flow Measuring Probes can be completely installed from outside of the fan making it ideal for when proper duct locations are unavailable. With its lightweight and durable construction in addition to its ease of installation, this product lends itself to being used in the HVAC industry.

There are two versions of the model FAFM fan inlet air flow probes to choose from depending on the depth of the fan inlet.

For fan inlets with depth less than 3-1/2" (8.89 cm): Please order a fan inlet probe with an "S" suffix. This probe has a diameter of .375" (.95 cm). It employs one total flow measuring tube and one static measuring tube. Each probe is covered with an extruded aluminum anodized coat. Each measuring tube has multiple sensing points.

For fan inlets with depth greater than 3-1/2" (8.89 cm): Please order a fan inlet probe with a "D" suffix. This probe has a diameter of 3-1/2" (8.89 cm). It employs extruded aluminum anodized coated probes with both total and static sensors on each tube.

Please Note: These are sold in sets of two. A set is necessary in order to ensure an accurate reading. No more than two air flow measurement probes will be needed to obtain an accurate reading.

Series FLST Duct Mounted Airflow Measurement Station

The Series FLST Airflow Measurement Station is easy to install -- simply connect the tubing to the station fittings, then to a differential pressure manometer, gage, transmitter or switch. Single or multiple airflow elements are factory mounted and pre-piped in a casing designed for flanged connection to the duct work. Standard materials consist of a G90 galvanized casing and 6063-T5 anodized aluminum flow sensors, suitable for most HVAC applications.

The Series FLST utilizes an airflow averaging element in a head-type device, generating a differential (velocity) pressure signal similar to the orifice, venturi, and other had producing primary elements. Strategically located sensing ports continually sample the total and static pressures when inserted normal to flow.

Total pressure sensed by the upstream ports are continually averaged within the airflow element in an isolated chamber. The static sensing ports are averaged in a second isolation chamber. Multiple elements are joined together for connection to a differential measurement device (gage, transmitter, etc.) for flow measurement and indication purposes.

Product Applications

  • Sensing fan, blower, and air handler output.
  • Determine duct flow rates in various zones in builiding.

Series MAFS Metal Averaging Flow Sensor

The Series MAFS is ideal for use with Dwyer Instruments, Inc. precision air velocity gages, transmitters and switches. The Series MAFS uses evenly distributed total and static pressure measuring points to deliver an accurate measurement of flows in a duct. The blade profile provides enhanced performance with minimal flow disruption in the air stream. The air flow measuring probe can be completely installed from the outside of round or circular ducts, making it very quick to install. With its lightweight and durable construction, in addition to its ease of installation, the MAFS flow sensor lends itself superbly to applications in the HVAC industry.

Series PAFS-1000 Averaging Flow Sensor

The Series PAFS-1000 Averaging Flow Sensor is ideal for sensing differential pressure in the inlet section of variable air volume terminal units and fan terminal units. Units can also be used to sense differential pressure at other locations in the main or branch duct systems.

The "H" port senses total pressure and the "L" port senses static pressure. The difference between these signals is the differential, or velocity pressure. For models PAFS-1002 to PAFS-1005, up to four sensing points and lengths of 3-5/32" to 9-29/32" (8.02 to 25.26 cm) to accommodate box size diameters of 4" to 16" (10.16 to 40.64 cm) are available. For models PAFS-1006 to PAFS -1011, up to 10 sensing points and lengths from 12-1/2" to 23-29/32" (31.75 to 60.72 cm) are available to accommodate appropriately sized duct dimensions.

Product Applications

  • Zone control in HVAC systems

Series STRA Duct Mounted Airflow Measurement Station

The Series STRA Airflow Measurement Station is easy to install -- simply connect the tubing to the station fittings, then to a differential pressure manometer, gage, transmitter or switch. Single or multiple airflow elements are factory mounted and pre-piped in a casing designed for flanged connection to the duct work. The Series STRA utilizes an airflow averaging element in a head-type device, generating a differential (velocity) pressure signal similar to the orifice, venturi, and other head producing primary elements. It has been developed with a honeycomb airflow straightening section for use in duct systems having highly turbulent conditions at the point of measurement. Strategically located sensing ports continually sample the total and static pressures when inserted normal to flow. Total pressures sensed by the upstream ports are continually averaged within the airflow element in an isolated chamber. The static sensing ports are averaged in a second isolation chamber. Multiple elements are joined together for connection to a differential measurement device (gage, transmitter, etc.) for flow measurement and indication purposes.

Wet Differential Pressure Manometer With HKIT

Product Details:
  • Application: Industrial, Laboratory

Wet/Wet Handheld Digital Manometer for compatible liquid and gas pressure measurement are versatile, handheld, battery operated available in several basic ranges for positive or positive differential pressure measurements.

Hydronic meter kit includes: (2) six foot high-pressure rated tubing with shut off valves, high pressure 3-way valve, 8 ft poly tubing for purges, hard travel case, handheld carrying strap, 1/16" x 1 1/2", 1/8" x 3" and 1/8" x 1-1/2" pairs of pressure probes, 90° Flare to 1/4" NPT fittings, adjustable 8" wrench, PTFE Tape, and magnetic protective rubber boot. NIST Calibration Certificate comes standard.

Features:
  • Upto 0.5% accuracy
  • Seven user selectable English and metric units
  • Stores upto 40 readings
  • Backlight for use in dim areas

Applications:
  • HEPA filters to determine when a filter needs to be changed
  • Measure pressure drop across pumps
  • Valves to determine valve position
  • Chiller to coils for freeze protection

Dwyer Handheld Indoor Air Quality Meter

Approx Price: Rs 27,500 / Piece 
  • Dwyer Indoor Air Quality Meter reduces the no of instruments a contractor has to carry by measuring carbon dioxide concentration, air temperature and humidity percentage in one device.
    Specifications:
  • Measurement range: CO2: 0 to 2000 ppm
    Temperature: -10 to 60 deg C Humidity: 0 to 99.9% RH
  • Accuracy: CO2: ±30 ppm ±5% of reading
    Temperature:±0.9°F (±0.6°C); Humidity: ±3% RH (10 to 90%), ±5% (0.0 to 9.9% or 90 to 99.9%).
  • CO2 Sensor: Non-dispersive infrared.

    Features:
  • A large backlit display shows all three parameters simultaneously.
  • It can display dew point or wet bulb temperatures in place of ambient temperature.
  • Minimum, maximum and average readings are easily accessible through the function buttons.
  • By pressing the hold key, current values are held so that the current ambient conditions are becoming hazardous.

Telaire Handheld Air Quality Meter

Approx Price: Rs 34,500 / Piece 
Specification:
  • Indoor Air Quality Instrument to record Temperature, Humidity and graph recorded data.
  • Large and easy to display.
  • CO2 range upto 10000 ppm.
  • Accuracy: 0-2000 ppm : +/- 50ppm or 5% of reading whichever is greater
  • 2000-10000 ppm: +/- 10% of reading
  • Patented dual beam, Absorption Infrared gas sensor ensures long term stability and durability.
  • Calculates & displays real time ventilation rates in CFM or Litres/minute per person based on differential CO2 levels outside and inside the building.

Dwyer Air Velocity Transmitter

Approx Price: Rs 38,500 / Unit 
Dwyer Air Velocity Transmitter with remote probe for remotely mounting electronic enclosure.

Features:
  • Ranges from 250 FPM (1.25 MPS) to 15000 FPM (75 MPS)
  • Optional bright LED display
  • Easy push button set up
  • Compact housing
  • 4 to 20 mA output
  • Digital signal for filter damping
Applications:
  • Exhaust stack flow monitoring
  • Air control in drying process
  • HVAC air velocity measurements
  • Fan supply and exhaust tracking
  • Clean room ventilation monitoring
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