Patent ID: 7132659

Claim:
A method of communicating information from a sensor, the sensor including a source of energy within an explosion-proof housing thereof; energy from the energy source interacting with an analyte in a detectable manner, the sensor further having at least one transmissive section in the housing through which energy can be transmitted, the method comprising: placing a calibration cap in operative connection with the sensor; communicating a wireless signal from the calibration cap to the sensor to place the sensor in a calibration mode; modulating the emission of energy from the energy source in a manner that corresponds to information related to the calibration mode to be transmitted from the sensor through the transnissive section; receiving the modulated emission of energy transmitted through the tranamissive section formed in the explosion-proof housing by a detector on the calibration cap; and displaying information corresponding to the modulated emission of energy on a display of the calibration cap.