WIKA GDS-RC-HV Betriebsanleitung Seite 15

5. Commissioning, operation
Schematic diagram of the switch behaviour with rising or falling gas density over time:
P
@ 20 °C
SP1
SP2
SP3
SP4
Switches Terminals
11 - 13
S1
11 - 12
21 - 23
S2
21- 22
31 - 33
S3
31 - 32
41 - 43
S4
41 - 42
The actual order of the switch points is customer-specific.
If the gas density switch is not pressurised, all contacts are not actuated mechanically.
Fourth switch point: Pin 41 is connected to pin 42 (1).
If the gas density switch is pressurised, an overtravel of the switch point will switch the
switch contact from pins 41-42 to pins 41-43.
The switch contact will not be switched back from pins 41-43 to pins 41-42 until the
value drops below the switching threshold.
Up to four switch contacts allow all desired switching functions to be completely
covered. Depending on the application requirement, falling closing, falling opening,
rising closing or rising opening can be switched.
The switch contacts are adjusted for either falling or rising density.
It is recommended to always switch only in the switching direction adjust-
ed ex works, since otherwise the switch hysteresis of the switch contact
also has to be taken into account.
→ Detailed information regarding hysteresis see data sheet SP 60.28
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