A pig indicator or "pig sig" is used to detect the passage of the pig and alert the operator by tripping a suitable warning device.
清管器指示器或“清管器发讯器”用来探测清管器是否通过、并启动报警装置通知操作人员。
A pig indicator or "pig sig" is used to detect the passage of the pig and alert the operator by tripping a suitable warning device.
清管器指示器或“清管器发讯器”用来探测清管器是否通过、并启动报警装置通知操作人员。
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