Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Ammonia Generator for Maintaining a Set Indoor Gas Concentration for Poultry Health Research

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2020 ASABE Annual International Virtual Meeting  2001224.(doi:10.13031/aim.202001224)
Authors:   Daniel W Hofstetter, Eli Baker, Eileen E Fabian, Lorenzoni Gino
Keywords:   Ammonia, Arduino, controls, gas sensor, MQ-137, NH3, poultry, ultrasonic humidifier.

Abstract. An ammonia gas (NH3) generator was developed to maintain a desired concentration of ammonia gas in a controlled environmental chamber to study poultry physiological response to sustained elevated levels of ammonia gas. The goal was to maintain 50 parts per million (ppm) of ammonia gas in a 3.7 x 4.3 x 2.4m (12 x 14 x 8 ft) controlled environmental chamber. The chamber had a 1.5 m3/s (3,060 cfm) recirculation system that regulated indoor temperature and humidity levels and a 0.06 m3/s (130 cfm) exhaust fan that exchanged indoor air for fresh outdoor air. The ammonia generator was fabricated by coupling ultrasonic humidifiers with an Arduino-based control system. The reservoir chambers of the humidifiers were filled with 2% ammonia liquid. For the system tested, it was found that 7.6 liters (2 gallons) of 2% ammonia cleaning liquid could maintain the target gas level of 50 ppm in the chamber air for a duration of 30 hours before refilling was required. The control system was capable of maintaining an ammonia gas concentration within +/- 5% of the target using a metallic oxide MQ-137 ammonia gas sensor.

(Download PDF)    (Export to EndNotes)