Maintenance-free cooling device

A system for monitoring a helium compressor, the system comprising:

• a photoelectric converter configured to:
• monitor a status current of a helium compressor, output a first level signal in response to the status current being output, and output a second level signal in response to the status current being interrupted;
• a dry contact signal converter including:
• a dry contact switch having:
• a first pair of switch contacts and a second pair of switch contacts, the first pair of switch contacts being connected to an output of the photoelectric converter and being configured to act in response to a connected level signal changing from the first level signal to the second level signal, and the second pair of switch contacts being connected to an output voltage signal of the helium compressor and being configured to act in response to the output voltage signal changes from a third level signal to a fourth level signal;
• and
• a signal converter configured to:
• collect an action signal of the dry contact switch, and:
• in response to the first pair of switch contacts acting into a network signal, convert fault information corresponding to the first pair of switch contacts and send the converted first pair fault information to a network server;
• and
• in response to the second pair of switch contacts acting into the network signal, convert fault information corresponding to the second pair of switch contacts and send the converted second pair fault information to the network server;
• and
• the network server configured to generate a notification to notify corresponding maintenance personnel of the fault information in a preset communication mode and using a preset communication address in response to receiving the network signal of the fault information.