D-Zero General Support: Description of the D-Zero High Sensitivity Smoke Detector System (HSSD)
There are nine separate zones of high sensitivity smoke detection (HSSD) at Dzero. These zones, their coverage, their condition thresholds, and their response to conditions are described in the table in the 'Zones & Responses' section of this document. This is an 'air-sampling' smoke detection system. Each zone is formed of a network of pipes which contain strategically sized and located air sampling holes. Each zone has a fanbox/detector head that continuously draws air into the holes and through the pipes to the detector head where it is evaluated for combustion products. The fanbox/detector heads are located on the Dzero detector platform and in the trusses. Each fanbox/detector head has a remotely located display control card (DCC) for monitoring the level of obscuration of the air sample. This remote equipment is located on the roof of the moving counting house. The DCC for each zone is networked to a single intelligent interface module (11M), also on the roof of the MCH, that collects the information from all nine zones and delivers it to the Dzero control room via an isolated RS-485 link to an operators console. This console is replicated via a 'remote video, keyboard, mouse system' in the DAB 4th floor entry lobby for use by fire response personnel. Internal thresholds that have been set in the DCC via the operators console provides alarm level I (lowest), alarm level 2, and alarm level 3 (highest) for each zone. These alarms are then used as inputs to the Fermilab FIRUS system, and as interlocks to equipment. This system is nearly 2000 times more sensitive than conventional smoke detectors. It is sensitive enough to detect invisible products of combustion such as the outgassing of electrical components, overheating PVC wire insulation, or small changes in the ambient level of obscuration caused in the incipient stage of a fire.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1033673
- Report Number(s):
- FERMILAB-D0-EN-558; TRN: US1200653
- Country of Publication:
- United States
- Language:
- English
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