What we did:
The hydraulic cylinder had to be fitted with bot limit switches and a 4 – 20 mA feedback device. Both had to work at depths of 80 m and both had to be hazardous area rated. We found that suppliers of such electrical items offered a submersible version but only to depths of 4 m for 2.5 hours. We developed and built a series of protective cases for the electrical items and then had them hyperbarically tested to prove to the client that the devices were suitable for the parameters laid down in the contract. The design passed the customers tests and have been in service for over 6 years with regular flooding of the shaft taking place.
We designed the electrical panels and wrote the software to control the hydraulic pump unit and cylinder and integrated it with the customers SCADA system.
We provided full installation of the equipment and commissioning services.