| 摘要 |
<p>A vessel such as a dairy pasteuriser having a path (B) for product and a separate path (A) for coolant in intimate relationship is tested for leaks by circulating a donor fluid under pressure in path (A) whilst a recipient fluid such as clean tap water is circulated in path (B). If the donor fluid is an electolyte, a probe (12) is placed in path (B) to measure the conductivity of the recipient fluid. A rise in conductivity over a period indicates leakage between the two paths, the rate of change indicating the size of the leak. Alternatively, the donor fluid can be a gas, and leakage detected using an ultrasound probe.</p> |
