The P632 is used as a safety device and must therefore be routinely injection tested for proper operation. The first functional tests should be carried out approximately 6 to 12 months after commissioning. Functional tests should be performed at intervals of 2 to 3 years – 4 years at the maximum.

The P632 incorporates in its system a very extensive self-monitoring function for hardware and software. The internal structure guarantees, for example, that communication within the processor system will be checked on a continuing basis.

Nonetheless, there are a number of subfunctions that cannot be checked by the self-monitoring feature without injection testing from the device terminals. The respective device-specific properties and settings must be observed in such cases.

In particular, none of the control and signaling circuits that are run to the device from the outside are checked by the self-monitoring function.