The Crowcon Nimbus is obsolete and replaced by the IRmax.
Using infrared absorption, the Nimbus was a gas detector for hydrocarbon gases.
Rugged & reliable
Nimbus has been designed to be lightweight but rugged. Even in the dirtiest conditions, Nimbus still functions. The optics operate at up to 90% obscuration. While still detecting gas at 75% obscuration, a dirty optics warning flashes so you know when to clean Nimbus. Dust and water ingress are not a problem either, as Nimbus is rated IP66 and IP67. Allied to this Nimbus has full approvals from both EUROPE and North America. Nimbus has an MTBF of 10 years. This figure has been independently assessed using the MIL Handbook 217F/2/12/91.
One person calibration
Nimbus is compatible with Windows software, which means that a Windows-compatible portable PC can be used to check gas levels, find faults and change configurations in the field. Only one person is required to do this. Nimbus is fitted with an optical Communications Interface Module to allow connection of a PC without opening the detector. The configuration and status can be checked remotely using the Modbus serial link for detectors installed in a hazardous area.
Nimbus has a local external status light, which shows, at a glance, if the unit is in normal function or fault. When a hazard is detected, it indicates both rising gas and alarm levels. The status light indicates 22 further conditions for instant diagnosis. Nimbus is simple to use even in inaccessible areas. A duct mounting plate is available, incorporating a remote gassing port to allow calibration checking without requiring entry into the duct.
Nimbus can be integrated into existing situations with ease. It has an RS485 output and dual redundant 4-20mA outputs compatible with metric and imperial armoured cable and conduit. The Modbus serial link allows addressable detectors to be looped, providing a remote control and interrogation facility. For facilities where Nimbus is replacing a pellistor-based detector, the pellistor mimic means that existing cabling can be retained to reduce upgrade costs.