Switch Contacts - WIKA 7 Série Mode D'emploi

3. Technical data and intended use / 4. Switch contacts
Permissible vibration load at the mounting point
The instruments should always be installed in locations free from vibration.

If necessary, it is possible to isolate the instrument from the mounting point

by installing a flexible connection line between the measuring point and the
pressure gauge and mounting the instrument on a suitable bracket.
If this is not possible, the following limit values must not be exceeded:

Dry gauges:
(Model 73)
Liquid-filled gauges:
(Model 733)
The liquid filling must be checked on a regular basis.
The liquid level must not drop below 75 % of the gauge diameter.

4. Switch contacts

EC-type examination certificates
Standard version Model 831.XX

PTB 99 ATEX 19 X (Appendix 3) and ZELM 03 ATEX 018 X (Appendix 5)
Depending on the number of switches and on the case diameter either
Model SJ2-N... or Model SJ3.5-...-N... is used.
Safety pattern version Models 831.XX - SN or - S1N

PTB 00 ATEX 049 X (Appendix 4) and ZELM 03 ATEX 018 X (Appendix 5
Depending on the number of switches and on the case diameter either
Models SJ 2-SN..., SJ 2-S1N..., SJ 3.5-SN.. or SJ 3.5-S1N... are used.
The built-in sensor type is stated on the product label of the pressure gauge.
Wiring details
The electrical connections must only be made by qualified personnel

Connection of the switches via screw terminals in the terminal box

Conductor cross section max. 1.5 mm

The terminal assignment is stated on the connection plate of the

pressure gauge
The instruments must be connected to the equipotential bonding of the plant

WIKA Operating instructions pressure gauges Model 7 with 831 per ATEX
Frequency range < 150 Hz
Acceleration < 0.7 g (7 m/s
Frequency range < 150 Hz
Acceleration < 4 g (40 m/s

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