For above ground installation, the receiver &launcher shall be horizontal, which center is about 1m high from ground, and shall be connected to underground pipe by nozzle stub and bend but not skewed crossing connection.

• 地面安装时，收发球筒为卧式，中心距地面高度一般为1米左右，通过短管及弯管与地下管线连接，不宜采取斜交叉连接。