Research of the Harmful Gas Detection and Control System in Dairy
Authors: Yang Shi Feng , Liu Ya Juan 
Published: August 2013

This design constructs the harmful gas detection and automatic control system for NH3 and H2S in the dairy, which based on the electronic nose and LabVIEW virtual instrument technology development platform. This control system tests the harmful gas concentration of NH3 and H2S through the semiconductor gas sensor MQ-137 and MQ-136; The NH3 and H2S concentration change into the corresponding signals through the A/D conversion chip, for the signal acquisition and processing; The system realize the functions of the harmful gas concentration of real-time data acquisition, display, storage, which used graphical programming language LabVIEW, and control the harmful gas concentration intelligently and automation. This control system has the advantages of high sensitivity, reliable work and the good effectAnimal husbandry is an important part of the agricultural economy, and the breeding industry of milk cows is an important part of animal husbandry, the dairy not only provide in a large number of high-quality milk products but also provide the community with a large number of employment opportunities, improving the living quality, promoting the social economic development. It has played an important role for social progress. [1]
With the development of economy and the improvement of people's living standard, the demand of dairy products increasing promote the rapid development of the dairies. In recent years, the development of dairy industry is rapid, and the number of cows and milk products is total in the world, and industry development direction change into the scale, intensive and professional barn feeding level.
But it also appeared some problems. As is known to all, the modern animal husbandry production of four elements is variety, feed nutrition, environment management and disease prevention, the importance of livestock environment also gradually cause the attention of the authorities. These are two reasons, one is that the environment pollution by the cows excrement is more serious, becoming a new pollution source. If these excrement is not managed properly, it will affect the sustainable development of the breeding industry of milk cows, even threat to the human’s health; The other is that a lot of peculiar smell harmful gas is produced by these waste, such as NH3,H2S. These will hazard the cow health.
Dairy environment control is the key measures which should be meet the cow the best growth needs and improve the production level. Good control of the dairy is the guarantee to improve the environment dairy production capacity, get higher economic benefits and environmental benefits. Therefore, the harmful gas concentration is controlled effectively of the dairy, it is important significance for the growth of cows and milk production, give full play to its production potential and achieve high yield, high efficiency. [2]
This paper used electronic nose, LabVIEW and single-chip microcomputer technology, it design the dairy harmful gas effective control system, realized the dairy real-time data acquisition and automatic control, improve the work efficiency and reliability.