“通过检查，发现流量计的一根信号线没连接好（脱落）”，请问英文怎么翻译？

通过检查，发现流量计的一根信号线没连接好（脱落）

After checking it, we found that a signal line of the flowmeter was off.

After checking, a unconected signal line of the Flowmeter was found.

A signal connection to the flowmeter was failed , we found after inspect .