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General Motors has announced that its FL3100H UV/IR and FL3101H UV flame detectors are now compatible with the Hart communication protocol.

The products are designed to detect fires over a wide field of view and provide alarm outputs directly from the detector while maintaining false-alarm immunity.

Hart is a communications protocol that provides uniform and consistent communication without disturbing the integrity of the 4-20mA analogue signal.

In addition to the process variable, the Hart protocol permits access to device configuration, diagnostics, and maintenance and alarm records.

Additional information related to plant operation is available to the control room through Hart.

The Model FL3100H detects fires by monitoring in ultraviolet (UV) and infrared (IR) spectral ranges, making it immune to false alarms caused by lightning, arc welding, hot objects and other sources of radiation.

The Model FL3101H monitors only the ultraviolet (UV) spectral range for optimised speed of response.

Both devices feature continuous optical path monitoring (COPM), operate over a broad temperature range and feature a 4-20mA stepped output, which is the industry standard for alarm and fault indication.

Each device includes three SPDT high-current programmable relay outputs that provide immediate and time delayed outputs for alarm, warn and fault conditions.

They also include an RS-485 serial output with Modbus RTU protocol for linking up to 128 detectors in series or 247 with repeaters.

The RS-485 and Hart outputs provide status, alarm, fault and other information for operation, troubleshooting, or programming of the units.

Since Hart signals are carried over the same wiring as is typically used for conventional analogue instruments, no rewiring is required.

Developed for use in a range of industries, the FL3100H and FL3101H detectors support oil and gas production, refining, distribution, and storage operations.

Other applications include chemical processing, aircraft hangars and electrostatic spray-paint booths.

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