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11041781.04 01/2020 EN/DE
Pressure gauge with reed contact model 851-A, for Ex areas
EN
Switch contact model 851-A
A reed contact consists of three contact tongues (change-over
contact, SPDT), made of a ferromagnetic material, which are
fused in a glass body under an inert gas atmosphere. The reed
contact is actuated by an external magnetic field (e.g. permanent
magnet). If a magnetic field passes the reed contact, both contact
tongues attract each other and close the contact. The electrical
current can flow. If the magnetic field moves away, the field
strength drops, but the contact remains closed through the bista-
bility. Only a new traverse of the reed contact with a magnetic field
in the opposite direction opens the two contact tongues again.
2.3 Scope of delivery
Cross-check scope of delivery with delivery note.
2. Design and function
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