Application Example - Zander Aachen SCB Serie Betriebsanleitung

Safety Time Control Device
ATTENTION
If the function switch-off delay with automatic re-trigger function is used, the automatic
reset at the moment of re-triggering has to be considered separately, since the monito-
red, manual start is disabled in this moment.

8. Application example

8.1 Filtering exceedings of set limit values with automatic re-trigger function
Short-term, process-related exceeding of set limit values cannot be completely excluded,
and should not necessarily lead to the immediate shutdown of a system.
Because this might lead to unnecessary standstills with a high personnel expenditure re-
garding resetting.
By filtering these signals with an SCB, the availability of a system can be maintained
without safety loss. Figure 2 shows a suitable application example with an SCB-02.
Figure 2: SCB-02 for filtering short-term triggering of a pressure switch
H. ZANDER GmbH & Co. KG • Am Gut Wolf 15 • 52070 Aachen • Deutschland • Tel +49 241 9105010
Fax +49 241 91050138 • info@zander-aachen.de • www.zander-aachen.de
11