Designs for enhanced reliability and calibration of landfill gas measurement and control devices

A method performed by an apparatus for sampling landfill gas flowing through a pipe, the apparatus comprising an enclosure for coupling to a section of the pipe, the section of the pipe having at least one gas sampling port, at least one sensor device disposed in the enclosure and coupled to the section of the pipe through the at least one gas sampling port, a wireless transmitter, and a controller, the method comprising:

• obtaining at least one measurement, using the at least one sensor device, of a concentration of at least one constituent gas in the landfill gas flowing through the pipe;
• transmitting, using the wireless transmitter, the at least one measurement obtained by the at least one sensor device to an external device;
• and
• adjusting a frequency of landfill gas sampling based at least on an available battery charge and/or an available power supply voltage of the apparatus, wherein adjusting the frequency of landfill gas sampling comprises adjusting a frequency of operation of at least one pump for pumping landfill gas from the pipe to a region of the enclosure having the at least one sensor device such that the at least one pump continues to pump the landfill gas into the region of the enclosure, but at a reduced frequency.

An apparatus for sampling landfill gas flowing through a pipe, the apparatus comprising:

• an enclosure configured for coupling to a section of the pipe, the section of the pipe having at least one gas sampling port;
• at least one sensor device disposed in a region of the enclosure, the at least one sensor device being coupled to the section of the pipe through the at least one gas sampling port;
• and
• at least one controller configured to:
• adjust a frequency of landfill gas sampling based at least in part on a temperature inside the enclosure and/or landfill gas temperature, wherein adjusting the frequency of landfill gas sampling comprises adjusting a frequency of operation of the at least one sensor device such that the at least one sensor device continues to perform the landfill gas sampling, but at a reduced frequency.