| 摘要 |
In apparatus comprising a liquid flow sensor e.g. 103 controlling the frequency of electrical pulses applied from a pulse generator across a first electrode formed by an elongate reservoir e.g. 110 for the liquid and electrode probe e.g. 106 extending into the liquid through a wall of the reservoir, the reservoir is enclosed in a housing 101 to one wall of which is secured a second housing 104 containing the generator access to the probe e.g. for cleaning is effected by disengaging the housings. This arrangement has the advantages of being compact, easy to install and requires little maintenance. In an embodiment the reservoir is sealed by blocks 111, 114 secured to tube 110 by probe 106. Piston 117 is mounted coaxially of probe 106 in a blind bore of block 111. The position of the piston varies with liquid flow and in turn varies the pulse frequency. <IMAGE> |
