What is the normal measuring range for Wheatstone Bridge or Pellistor type methanometers?

The correct measuring range for Wheatstone Bridge or Pellistor type methanometers is typically from 0 to 5%. These devices are designed to detect low concentrations of methane gas, which is crucial for safety in environments where methane may be present, such as mines or waste treatment facilities.

This limited range allows for accurate detection of methane concentrations, ensuring that early warning systems can alert personnel before reaching dangerous levels. Methanometers within this range are calibrated to be sensitive enough to detect small changes in methane concentration, making them valuable for monitoring safety in the workplace.

While other ranges mentioned in the options might be relevant for different types of sensors or applications, the specific capabilities of the Wheatstone Bridge or Pellistor type methanometers are optimally suited for this narrower range. This ensures both precision in measurements and safety in areas where methane monitoring is essential.