| 摘要 |
A fluid detector comprises a probe, a probe cap and an electric cable connecting the probe and cap. A stainless steel lead is attached to the end of the probe opposite the cable. The distal end of an electrician's fish is inserted through an entry port into the space between the walls of a double-walled tank and run around the tank until it returns to the entry port. The end of the fish is engaged by a hook, pulled from the tank, and connected to the probe lead. The electric probe cable has a length equal to the distance from the entry port to the desired probe position. The fish lead and probe are pulled around the tank until the distal end of the fish emerges from the tank. The lead is disengaged from the fish and passed through the cap. The slack in the lead is taken in, and the lead is attached to the cap. Alternatively, the distal end of the fish may be inserted into a channel in the probe casing, the probe inserted into the tank and directed into position, and the fish disengaged from the probe and removed from the tank.
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