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guo wai mei kuang an quan dong tai
Pages: 62-63
Year: Issue:  1
Journal: Safety in Coal Mines

Keyword:  煤矿安全安全仪表粉尘热线式风表风速计瓦斯安全炸药沼气警报器;
Abstract: <正> 美国煤矿安全仪表现状美国多年来采用热线式和叶轮式风表,其共同的缺点是不结实并且要受粉尘和温度的影响。为此,现在生产了一种涡频式风速计,经在井下使用,效果较好,不受粉尘和湿度的影响。唯一不足的是下限只能测到0.25米/秒。在沼气的检测上美国主要采用
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