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Rae RAEGuard EC User Manual
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Contents
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RAEGuard S EC / LEL / IR User’s Guide3. Theory of OperationThe RAEGuardS EC uses electrochemical sensors. The electronsgenerated at the working electrode travel via the contact pins to bemeasured at the external circuit and are returned to the counterelectrode to complete the circuit, The current of the sensor responseis proportional to the related EC sensors’ gas concentration.The RAEGuardS IR is based on the patented technology of non-dispersive infrared (NDIR) for hydrocarbon, carbon dioxide and othergas detection. After sample gas diffuses into the infrared optical gassensor, the electro-magnetic radiation cause oscillation on gasmolecules. If this happens the oscillation reduces the amount ofradiation, it absorbs a certain degree of radiation. The absorbance atspecified wavelength is a measure of the present gas concentration.The RAEGuardS LEL uses a highly poison-resistant catalytic beadlower explosion limit (LEL) sensor. After sample gas diffuses throughthe metal sinter into the combustion chamber, a pair of combustionelements inside the combustion chamber burns the combustible gasand generates an electrical signal.The RAEGuard S is a microcontroller-based instrument. After theelectrical signal is conditioned and converted to digital, themicrocontroller processes the data, which displays the results locallyand reconstructs the digital data into a standard 4-20 mA analogcurrent output signal and RS-485 digital output signal.The instrument has three magnetic sensing keys. The user maycalibrate the transmitter and change the alarm level setting via themagnetic front-panel key pad.33 |
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