The TetraSentry is an online testable, online repairable hydraulic trip interface with SIL 3 reliability in an ultra-compact footprint that’s designed specifically for turbomachinery applications. The TetraSentry is completely configurable, which makes it not only the most reliable, but also the most adaptable hydraulic trip interface available.
For applications that don’t have a programmable logic solver with four outputs, a “manual test” configuration is available that allows the TetraSentry to interface with an independent “two or three output overspeed detection system.” The manual test configuration allows for full online 2 testing of the TetraSentry. Optional block valves make this configuration online repairable.
For applications that have a programmable logic solver (we recommend the TSx), the TetraSentry can be configured with the instrumentation to allow for automatic testing.
If we’re providing a TSx for the electronic overspeed trip detection system, we’ll also program the TetraSentry testing logic. If we’re not, and the TetraSentry has been configured for automatic testing, we’ll provide a “narrative” that describes the test.