| 摘要 |
The comparators (29) and (30) compare the measurement value of the pick-up (27) with the voltages of the potentiometer (33 and 34) and control the latch (41) controlling the pump (43) to maintain a depression at the lower part of the tank (1). The counter (65) measures the down time of the pump (43), which down time is stored in the memory (72), and measures also its operation time, the sum being calculated by the circuit (71). The circuit (63) effects the quotient of the operation time divided by said sum. The circuit (64) calculates the quotient of the output of the pump (43), calculated by the calculator (62), divided by the square root, calculated by the calculator (60) of the depression measured by the pick-up (69), in the gas volume of the tank (1). The circuit (73) calculates the product of said quotients, the result of which being stored in the memory (66) and compared by the galvanometer (74) with the voltage of the generator (79) by controlling the needle (75) to provide a warning signal when the leakage from the tank (1) is too important for a new filling. |
