| 摘要 |
PROBLEM TO BE SOLVED: To provide a preset counter which always displays required flow rate numerical values to make them visible and is compact and reliable in operability. SOLUTION: The preset counter has three-row parallel arrangement of a total indicator 11 for indicating the cumulative flow quantity of a fluid, a count indicator 12 for indicating counts every measuring the flow quantity from the start of measuring to the stop and a preset indicator 13 for presetting a supply flow quantity. This eliminates the need for switching the indicators through operating switches as required, as before, and makes required flow quantities numerically recognizable at all times, not needing the indication switching each time. This also lessens operations by the operator and hence eliminates troublesome operations, thereby reducing time and labor. The operating switches employ photoelectric ones to avoid caring of the mechanical life of pushbutton switches, etc., or eliminating risk of switching operation failures due to wear.
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