Green building creates a tension between two different needs. On the one hand, an environmentally friendly property conserves energy. Since climate control applications are typically one of the largest energy users in a building, going green requires cutting them back. On the other hand, LEED and other standards also require that a building be effectively ventilated both for interior air quality (IAQ) and for occupant comfort. Ruskin air measuring products help to balance these two seemingly contradictory goals.
Inspect What You Expect
Renowned quality expert W. Edwards Deming was known to quip that “you can expect what you inspect.” The Ruskin EAMP — electronic air and temperature monitoring probe — helps you do just that. By measuring the rate at which air is flowing through your building, it can help your HVAC system to tune itself for maximum airflow and indoor air quality while consuming as little energy as possible.
The Ruskin EAMP probe is designed to be installed in a duct or plenum with rectangular, round or oval shape. It has a probe with an airfoil shape that measures both airflow and temperature at different points. Each sensing point consists of two factory-calibrated thermistors. The lower sensor remains at the ambient air temperature while the upper one is heated. Since the heat transfer and velocity are mathematically related, the sensor can use the known temperature differences between the two thermistors and the distance between them to measure both factors. The sensor packages on the probe connect to a digital transmitter that multiplexes the data and sends it to a separate control transmitter unit.
A single Ruskin EAMP020 control transmitter can capture data from four different probes, providing the ability to measure sixteen different sensing points. It has a display so that you can check the data from the EAMP right on its front face, but it can also retransmit that information to the building’s automation system over its analog RJ-45 outputs.
EAMPs operate under a wide range of conditions. They measure airflows as slow as 0 feet per minute and as high as 2,500 feet per minute. The sensors also sense temperatures ranging from -25 to 140 degrees Fahrenheit. The EAMP020 transmitter can output velocity or temperature data over 4 to 20 milli-Amp or 2 to 10 Volt signals.
Using the Data
By itself, the EAMP is just a data source. Its ability to improve a building’s IAQ and environmental performance comes into play when it integrates with a building control system. As the controller has a sense of how much air is actually making it from blowers to ducts and what the temperature of that air actually is, it can modify the performance of the building’s climate control systems. If areas are receiving too much air, motors can be shut down or slowed, and dampers adjust airflow to certain areas of the building and redirect it to where it is needed. Without data from a network of Ruskin EAMPs, though, this task would be impossible.