Infrared gas detector Edinburgh Instruments
Guardian

The Guardian range of infrared gas monitors offers near-analyser quality
continuous sampling, measurement and display of target gas concentrations at an attractive price.

The Guardian SP is a high accuracy monitor offering increased short term stability in lower ranges than Guardian plus models.

For many years, Edinburgh Sensors has pioneered novel non-dispersive infra-red dual wavelength sensors with a single optical path and without moving parts. This ensures long term stability, without the need for frequent re-calibration and makes the sensor highly gas specific and insensitive to other gases or water vapour.

The Guardian plus uses a robust infra-red source, proven in the Gascard II sensor, to ensure long lifetime and reduced susceptibility to shock. The reliability is further enhanced by the elimination of all moving parts from the sensor head.


The Guardian SP is easily maintained requiring only a few minutes per year to replace the hydrophobic particle filter in the inlet housing and a simple calibration procedure to check the accuracy, typically once a year. Applications include plant physiology, horticulture, fruit storage, leak detection, landfill, ventilation control, process control, furnace applications.

The Guardian SP includes an internal pump, liquid crystal display and temperature correction. It also offers a range of user-selectable bit-switches to control the latching alarms and analogue output options. The input power to the unit is user selectable to cover world-wide voltage and frequency standards.

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