Dwyer® Products Used for Testing, Adjusting, and Balancing a HVAC System

The purpose of testing, adjusting, and balancing (TAB) is to assure that an HVAC system is providing maximum occupant comfort, at the lowest energy cost possible. It is essential to use specialized and calibrated instruments to measure temperatures, differential pressures, air velocity, sound level for an evaluation of equipment, and system performance, before adjusting the balancing devices, such as dampers and valves. This balancing is usually based upon the designed air flow by the HVAC engineer of the project, and the TAB contractor submits a written report, which summarizes the testing and balancing results and notes any differences between the original design and the measurement results during the TAB work.
Dwyer Instruments continually develops and manufactures a full-range of building automation products for HVAC systems and energy-saving applications. Dwyer Instruments has sensors for temperature, humidity, differential pressure, air velocity, CO2, CO, current monitoring, and occupancy monitoring.  All of these products are used for the on-line HVAC process and are essential for the system to ensure efficient operation and improve energy conservation. Moreover, Dwyer Instruments also delivers the precise instruments for balancing of the HVAC system.
In this article, we will introduce some of the Dwyer® precision instruments commonly used in the TAB process that are accurate, easy to use, highly repeatable, reliable, and easy to maintain.
1.     Air Flow Hood (Model AFH2)
An air flow hood is one of most important items for air testing, adjusting, and balancing.
The Model AFH2 Air Flow Hood measures volumetric air flow from diffusers, grilles, registers, and any other type of air distribution devices. It maintains a running average of measurements in the desired units, and provides the ability to manually record the data over a given time period. The highly accurate digital manometer has an auto-zero feature and will auto-zero at user-defined intervals.
This lightweight flow hood is durable, easy to handle, and portable to carry.
The AFH2 comes with a calibration certificate for both hood and manometer.
2.     Air Quality Test Instrument Kits (Series AQTI)
Series AQTI Air Quality Test Instruments allow you to accurately and reliably measure a wide variety of HVAC testing and balancing parameters that will have your building HVAC system operating at peak efficiency.
Prepackaged in differential pressure, thermo-anemometer, or thermo-hygrometer probe kits for the measurement of temperature, humidity, air velocity and differential pressure. All compatible probes and modules can be field adapted at any moment and are instantly recognized by any UHH handheld base instrument.

3.     Test Instrument Mobile App (The Mobile Meter™)
The Mobile Meter™ Test Instrument Mobile App converts Android® based phones and tablets into a multi-function test instrument.
Parameters from multiple probes can be displayed simultaneously, or a single probe’s parameters can be displayed as a meter or analog gauge. Measurements from a single probe can be saved to log files for future use. Logged files can be viewed directly on the phone or emailed to another device or computer.

4.     Thermal Imaging Camera (Series TIC)
The Series TIC Thermal Imaging Camera can automatically adjust the color band for a narrower range of temperatures with the bright 2.5” 160 X 120 resolution LCD. Measurement range is from -4 to 482°F (-20 to 250°C).
Besides taking spot measurements, the camera can also be set for isothermal, area, or profile analysis. It boasts a data logger, reporting software, and also has the function to make voice annotations and real-time recordings.

5.     Dual Laser Extended Range Infrared Thermometer (Series IR6/IR7)
The Series IR6/IR7 Dual Laser Extended Range Infrared Thermometer is ideal for accurately measuring surface temperatures from long distances with the 50:1 distance to target ratio, which is ideal for any hard to reach locations. Practical and useful functions are abundant: high and low alarms with audible and visual indication, dual laser measurement range indication, and a built-in white light can be used to illuminate the measurement area.

6.     Digital Sound Meter (Model SM-100)
Model SM-100 Digital Sound Meter is ideal for measuring noise levels from 30 to 130 dB with accuracy of ±1.5 dB. The four digit LCD backlit display has the ability to update in 0.5 seconds when the unit is set to fast response. It is ideal for technicians testing and recording sound levels in zones or rooms of buildings, or near equipment / machinery.

7.     Portable Digital Tachometer (Model TAC-L)
The Model TAC-L Portable Digital Tachometer measures rotational speed either by contacting a rotatable head to the shaft of the object, or using photo sensor to detect the reflections from the laser. The laser target can record from a distance of up to 20 inches and gives a more accurate measurement than LED targeting. Model TAC-L includes a large LCD with a backlight for use in dark areas.

8.     Stainless Steel Pitot Tube (Series 160)
Ideal for use with our precision manometers and air velocity gauges, Dwyer® Pitot Tubes are constructed from corrosion resistant stainless steel for a lifetime of service. Permanent, stamped insertion depth graduations on sides of 160 series facilitate accurate positioning.

9.     Straight Stainless Steel Pitot Tube (Series 160F)
Ideal for use with our precision air velocity gages, transmitters and digital test instruments, the Series 160F Pitot Tubes are constructed from corrosion resistant stainless steel for a lifetime of service. Straight design allows for easy insertion into ducts through grills and pressure taps as well as aids in positioning in hard to reach locations where a hook style Pitot tube may not allow access.
Most of today's HVAC systems are being designed with a lot more individual temperature control, humidity control, and air flow control to improve occupant comfort. Dwyer’s wide variety of testing instruments helps to reach these goals, achieve the HVAC design specifications, extend maintenance intervals, improve energy conservation, and ensure efficient operation.
Whether you are on TAB work or commissioning for an HVAC system, in charge of new building construction or renovation, are a consultant, system integrator, contractor, or end user, Dwyer’s wide variety of testing instruments is surely your total instrumentation and control solution.  For more information on our line of HVAC test equipment products, please visit www.dwyer-inst.com/market/hvac