RAEGuard 3

The Next Step Up in Fixed Gas Detection

The RAEGuard 3 sits above the RAEGuard Lite in Honeywell’s RAE fixed gas detection range. Both monitor flammable, toxic and oxygen gases, output 4-20 mA and RS485 Modbus, and use magnetic tools for non intrusive configuration.

The RAEGuard 3 goes further. It adds TUV SIL2 assessment, an NDIR option for oxygen free methane detection, a redundant design built to prevent false alarms, hot swappable toxic and oxygen sensor modules, and a wider choice of housings and options. Where functional safety documentation is needed, or the gas environment is more demanding, the RAEGuard 3 is the better fit.

Sensors Built for Demanding Sites

The combustible gas detector uses catalytic sensors with a long life of more than 5 years and high resistance to poisoning. Toxic and oxygen detectors use compensated electrochemical sensors, and the oxygen detector doesn’t need a nitrogen zero calibration.

Catalytic sensors need oxygen to read accurately. In inert or oxygen depleted atmospheres, they can read falsely low. The NDIR option detects methane without needing oxygen, with long life and resistance to poisoning, so the RAEGuard 3 can be used in harsher gas detection environments.

Detectable gases include methane and flammable gases, oxygen, hydrogen sulphide, carbon monoxide, ammonia, chlorine, sulphur dioxide and vinyl chloride.

Self Management and Clear Alarms

The RAEGuard 3 keeps track of itself. It gives reminders when the sensor life or calibration period is due to expire, flags alarms, STEL and TWA events, faults and warnings, and shows fault codes. It inhibits outputs automatically during maintenance.

Three highly visible LED status indicators and a backlit LCD with text, bar graph, digits and icons show detector status clearly. An optional integrated visual and audible alarm makes sure alarms aren’t missed.

Integration and Installation

The 3 wire 4-20 mA output can be fine tuned to avoid signal loss caused by long cable runs. RS485 Modbus RTU supports multi drop networking and real time remote monitoring, and optional HART 7.2 adds remote diagnostics and configuration. Three relays (2 A at 30 VDC) can be set as normally open or closed, energised or de-energised, and latching or non latching.

The sensor can be mounted locally or remotely. The RAEGuard 3 mounts on a wall, a vertical or horizontal pipe, or a duct, and a range of cable gland sizes is available. A flip up PCB block gives easy access to the plug in terminal blocks. An optional surge protection device adds protection for outdoor installations.