> For the complete documentation index, see [llms.txt](https://docs.ceruleansonar.com/c/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ceruleansonar.com/c/s-500-sounder/technical-details/instructions-for-adding-a-penetrator.md).

# Instructions for adding a penetrator

For some applications of the Sounder, a penetrator will be required. We recommend an M10 cable penetrator for 6mm cable available through Blue Robotics. To pass the cable through the penetrator, the JST-GH 3-pin connector will need to be removed and re-installed once the cable is through the penetrator. Instructions on how to do this are as follows.

Pry up on the tabs of the JST connector with a sharp object such as a hobby knife 

![](/files/RrCRw4T8wBJCWXsxJT7e)

Gently pull each of the three wires individually

![](/files/whOOHpP9zYlVZYr7YDav) 

Bend the tabs of the JST connector back down to their original position with the sharp object

![](/files/3yWHqFhsVJYDSc2uFymy)

Pass the cable through the penetrator

![](/files/5JeIewcz8bYVHzdapSus)

Replace each wire into the reused JST connector. Pin 1 is Shield (Yellow wire), Pin 2 is White, and Pin 3 is Black (or Red on newer units)

![](/files/kAk9RUCTu3NacQxVQ76i)

Ensure each wire does not come out of the JST connector when gently pulled on

![](/files/GWZyl6nwFsMDdt1rHPwG)

• If the wire comes out, the tab can be bent back down farther and the wire reinserted. 

• If the wires just won’t stay in the re-used connector, a replacement connector has been provided.