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Category: Instruments & Devices

Instruments & Devices

Flame Rectification Sensor

Posted on May 14, 2019June 9, 2019 by matt

The flame rectification sensor is commonly used in high efficiency furnaces that use direct burner ignition. Direct Burner Ignition System Flame Rectification Circuit — Direct…

Instruments & Devices

Thermocouple

Posted on May 14, 2019June 9, 2019 by matt

Thermocouples are used on residential gas furnaces equipped with standing pilots. A standing pilot is one which burns continuously, whether the main burner is on…

Instruments & Devices

Magnehelic® (Differential Pressure) Gauge

Posted on March 20, 2019June 10, 2019 by matt

Magnehelic® differential pressure gauges provide a direct reading of pressure and/or air velocity. These gauges are used to measure filter resistance, air velocity, and furnace…

Instruments & Devices

Manometers and Pitot Tubes/Static Pressure Tips

Posted on March 20, 2019June 10, 2019 by matt

Manometers (Figures 1-37 and 1-38) are used to measure velocity and static air pressures and gas pressures. Pitot tubes and static pressure tips are probes…

Instruments & Devices

Hygrometer

Posted on March 20, 2019June 10, 2019 by matt

Hygrometers (Figure 1-36) are used to measure the relative humidity in a controlled space. Hygrometers are also commonly called relative humidity meters. See Item 16…

Instruments & Devices

Psychrometric Chart

Posted on March 20, 2019June 10, 2019 by matt

Psychrometrics is the study of air and its properties, including temperature, pressure, moisture, and other characteristics. Control o f these properties is essential for human…

Instruments & Devices

Velometer

Posted on March 20, 2019June 10, 2019 by matt

Velometers (Figure 1-32) are used to measure the velocity of airflow. Like the anemometers described previously, velometers are used when evaluating the operation and/or balancing…

Instruments & Devices

Anemometer

Posted on March 20, 2019June 10, 2019 by matt

Anemometers are used to measure the velocity of airflow. Measurement of air velocity must be performed when evaluating the total operation of an air distribution…

Instruments & Devices

Hermetic Compressor Analyzer

Posted on March 20, 2019June 10, 2019 by matt

The hermetic compressor analyzer (Figure 1-28) is a single test instrument used to make multiple tests on hermetic compressors. This device eliminates the need for…

Instruments & Devices

Capacitor Tester

Posted on March 20, 2019June 10, 2019 by matt

The capacitor tester (Figure 1-27) is used to test capacitors to determine their specific capacitance value and to find out if they are good, open,…

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