| 摘要 |
A sensor for detecting the build up of deposits in plant, for example a paper-making installation, comprises an elongate probe 30 mounted on a mounting body 31 by way of at least one strain gauge. The strain gauges may be mounted on leaf springs 45, 45' and measure the static bending moment in the probe 30 or strain gauges may be used to monitor changes in the frequency of natural vibration of the probe 30 (Fig. 4). The measured change in mass of the probe provides an indication of the amount of deposit in the part of the plant in which it is placed and this signal can be used to control the application of a deposit-controlling composition. An optional further sensor can be provided to assess the nature of the deposit. <IMAGE> |
