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Limit Switch Contact Assemblies
Mechanical Contacts
Standard Contacts • Magnetic (Fast Make - Fast Break) Contacts
This data sheet contains important details of the available make/break operations and electrical connections of standard- and magnetic contact assemblies.
Detailed information about the method of operation and application of mechanical, inductive and pneumatic limit switch contact assem- blies are given in our general information leaflet 9000.
For pressure gauges with built-in limit switch contact assemblies special data sheets with dimensional drawings and details of the ordering codes can be found under the different catalogue headings, ending on number ..90, ..91 or ..19.1
Make/Break Operations
The available make/break operations of single and double contacts are shown in the table below.
Code letter S = standard contact, M = magnetic contact
Code number 1, making contact:
closes when the set point is passed in the clockwise direction(i.e. opens in counterclockwise direction)
Code number 2, breaking contact:
opens when the set point is passed in the clockwise direction (i.e. closes in counterclockwise direction)
Code number 3: changeover contact
Manifold Contact Assemblies
With 3 and 4 contacts see special options, reverse side Contact Pins Silver-nickel 10 µ gold-plated (AG80Ni20Au10µ)
Adjustment
Depending on pressure gauge model and version
– Cast into the acrylic glass window, or
- Nickel plated brass, built into the window, removable key
Electrical Connections
Depending on pressure gauge model and version
– 1 m (3 ft) connecting cable, passing through the case s back
– European universal plug connector mounted to the case;
The precise location of the lead through hole or the plug connector can be found in the data sheets for the inpidual pressure gauge models.
Connecting Cable
We use screwed cable glands M12x1.5 with strain relief for fixing the cable. The free ends of the cable are marked as shown in the circuit diagram; with green/yellow ground wire.
European Universal Plug Connector
The terminals in the connecting box are also numbered as shown in the circuit diagrams. A ground terminal is provided. The universal plug connector is delivered with a srewed cable gland
M20x1.5 with strain relief.
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