| Document ID (ISN) | 67405 |
| CIS number |
96-1480 |
| ISSN - Serial title |
0007-9952 - Cahiers de notes documentaires - Hygiène et sécurité du travail |
| Year |
1996 |
| Convention or series no. |
|
| Author(s) |
Marsot J. |
| Title |
Magnetic REED position sensors. Rules for use in safety applications |
| Original title |
Détecteurs de position magnétiques à lames souples [in French] |
| Bibliographic information |
2nd Quarter 1996, No.163, Note No.2021-163-96, p.185-196. Illus. 17 ref. |
| Abstract |
This study concerns the operating principles and characteristics of magnetic REED position sensors and the situation with regard to regulations and standards. It describes the tests carried out and their results. Being airtight, explosion-proof, chemical-resistant and easy to clean, these devices are replacing conventional mechanically operated position detectors in harsh environments. Objections have been raised, however, against the use of this type of sensor in safety applications, for example: possibility of defeating the device, sensitivity to mechanical vibrations and the very serious risk due to the welding of the contacts. The results of the study provide some answers to these objections, which include application of the redundancy principle (without fully eliminating the danger of contact welding) and the use of a sensor-specific control magnet ("coded magnet") to limit the possibility of defeating the device. |
| Descriptors (primary) |
safety devices; safety engineering; locking for safety; dangerous equipment; machinery |
| Descriptors (secondary) |
shutdown procedure; description of equipment; switchgear; automatic control; safety by design; moving guards; comment on directive; protection criteria; disconnection; reliability |
| Document type |
D - Periodical articles |
| Country / State or Province | France |
| Subject(s) |
Other equipment and plant
|
| Broad subject area(s) |
Mechanical hazards, transport
|
| Browse category(ies) |
Safety devices
Safety supervision
|
