1. An open or developmental site
For example, an open workshop uses this type of instrument as a safety alarm, and a wearable diffusion gas detector can be used, because it can continuously, real-time, and accurately display the concentration of toxic gases on site. Some of these new instruments are equipped with vibration alarm accessories to avoid inaudible alarms in noisy environments, and are installed with computer chips to record peak, STEL (15-minute short-term exposure level) and TWA (8-hour statistical weighted average) to provide specific guidance for worker health and safety.

2. Similar to strong closed or airtight venues
For example, reaction tanks, storage tanks or containers, sewers or other underground pipelines, underground facilities, agricultural closed granaries, railway tank cars, shipping cargo holds, tunnels and other workplaces must be tested before personnel enter, and must be tested outside the confined space. At this point, it is necessary to choose a multi-gas detector with a built-in sampling pump. Because the gas distribution and gas types in different parts (upper, middle and lower) in the confined space are very different.

Therefore, a complete gas detector in a confined space should be a portable instrument with a built-in pumping function for non-contact and sub-site detection. It has a multi-gas detection function to detect dangerous gases distributed in different spaces, including inorganic gases and organic gases. Only in this way can the absolute safety of the staff entering the confined space be guaranteed.