The module consists of NRV and filter element. NRV embedded in the lid ensures no leakage of any gas from the manhole to the atmosphere.

The filter element has the property of permitting the gases only when required and not the water. To assess the ncentration level of the poisonous gases before opening of the manhole lid, the male adaptor of the gas detector module has to be connected to the gas detector for establishing the passage for the gases which will be monitored by the hand held gas analyzer.

Gas Detector:

Product Demo: