| 摘要 |
A device for protecting the operator of mobile plant working in a polluted environment comprises an air treatment unit adapted to be fitted to or incorporated into a roof of a cab accommodating the operator. The air treatment unit contains at least one coarse filter element, a fine filter element and a chemical filter element. It further contains a motor-driven fan on the outlet side of the filter elements, a pressure monitoring device and a toxicity monitoring system. The toxicity monitoring system comprises at least one semiconductor sensor, a voltage selector and a display panel connected to the sensor(s) and to the voltage selector. |
