A field spectroscopic analyzer in an explosion hazard area is typically connected to a control PC in a safe area using optical fiber. A common choice for this is duplex 50/125 multimode fiber. In the case of the ReactIR 45P Process FTIR, an LC connection would be made to the instrument and fiber would be taken to a safe area (for instance control room or communication utility box inside the plant). An LC to ST patch cable would be used to connect the fiber to an ST media converter which in turn could be accessed using a standard Ethernet copper cable.
A lesser known, but sometimes more convenient technique for connectivity utilizes a wireless subscriber and either a safe area or explosion hazard area antenna. In this case, a short length of fiber is used to connect the analyzer to a classified area wireless subscriber. The wireless subscriber sends the signal to an antenna which is connected to a wireless module. ExLoc Instruments Hazard Solutions provides the needed hardware and expertise to implement wireless solutions for explosion hazard areas.
Another use for wireless communication arises in non-explosion hazard area for cold-room applications. The analyzer rating for low temperature (32 °F / 0 °C for the ReactIR 45P Process FTIR) may allow use in environments where a standard control PC might not function. Using a low temperature wireless subscribe, the control PC can be kept in an ambient temperature area without making a copper or fiber connection.
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