WIKA PGS21 User Manual
Page 9
WIKA operating instructions models PGS10, PGS11 and PGS21
9
4. Design and function / 5. Electrical switch contacts
4. Design and function
Description
Bourdon tube measuring elements are widely used in technical pressure
measurement due to their robustness and ease-of-use. Under the influence
of pressure, these measuring elements deform within their elastic limits.
This motion is converted, via a mechanical movement (toothed gear), into
a rotational motion. To this, an electrical limit switch is connected - the
magnetic snap-action contact. The contact closes or opens the connected
electrical circuits when the settable limit values are exceeded.
Scope of delivery
Cross-check scope of delivery with delivery note.
5. Electrical switch contacts
Electrical connection
■
The electrical connection must only be made by qualified skilled
personnel
■
Connection of the switches via cable or via screw terminals in the
terminal box (L-connector)
■
The terminal assignment is stated on the product label of the pressure
gauge
■
The gauges must be connected to the equipotential bonding of the plant
Electromagnetic compatibility
EMC per EN 60947-5-2.
The instruments are to be protected against strong electromagnetic fields.
11581752.02 09/2013 GB/D/F/E
GB