Monitoring for Carbon Dioxide and Methane

Edinburgh Sensors has launched the Guardian NG range of wall-mounted, single point gas monitors. This versatile new monitor range provides high accuracy, continuous sampling detection and measurement of either CO2 or CH4, with typical annual maintenance requirements of just 15 minutes. Improved measurement accuracy, new display capabilities, simplified set-up and enhanced external communication make the Guardian NG ideally suited to applications in a host of different industries.

Pressure and temperature-compensation have been added to proven, proprietary dual wavelength non-dispersive infrared detection technology to ensure true volume% readout of CO2 or CH4 over a wide range of temperatures and pressures. The Guardian NG’s inherent stability ensures no loss of calibration over extended periods. Models are available with detection ranges from 0-3000 ppm up to 0-100% by volume for CO2, and 0-5% to 0-100% for CH4 and an accuracy of better than ± 2% of full scale.

Gas concentration and pressure in the sampling cell are displayed on a new 5 digit LCD, which also allows simple menu setting of all monitor operating parameters including the independent high and low alarm settings. Gas concentration history over a period of up to 2 hours can be displayed graphically. The Guardian NG also includes password protection to prevent unauthorised adjustment of the monitor set up and calibration.

Built-in audible and visual alarm and fault indicators are complemented by volt-free relay contacts, as well as analogue outputs for connection to external indication, control or data logging devices. True RS232 output is provided, with optional LAN support.

Housed in an IP54-rated enclosure, the Guardian NG features an integral pump to allow gases to be sampled from distances up to 30 metres. The measurement cell is protected by a low flow gas sensor and an easily replaceable particle filter.

The Guardian NG can be used in high concentration applications such as biogas and landfill gas, low concentration applications such as horticulture and many others such as process control, indoor air quality, brewing and food processing.