초록 ▼

A leak test probe includes a pressure transducer which may be mounted in mechanical contact with liquid in the conduit. The pressure transducer provides a pressure signal to a microprocessor-based circuit which, following software stored in its memory determines if there is a leak in the conduit by

A leak test probe includes a pressure transducer which may be mounted in mechanical contact with liquid in the conduit. The pressure transducer provides a pressure signal to a microprocessor-based circuit which, following software stored in its memory determines if there is a leak in the conduit by measuring the time rate of change of the pressure. The software also analyses the pressure signal and compensates for the effect of gas in the conduit by determining the time rate of change in the pressure immediately after the pump turns off and adjusting a sliding time scale for the leak test depending on the result.

대표청구항 ▼

A leak test probe for use in a liquid storage and dispensing system, said leak test probe comprising: pressure transducer means for providing an pressure signal representative of the pressure in a liquid conduit; timing means for providing a timing signal; leak test means responsive to said pressure

A leak test probe for use in a liquid storage and dispensing system, said leak test probe comprising: pressure transducer means for providing an pressure signal representative of the pressure in a liquid conduit; timing means for providing a timing signal; leak test means responsive to said pressure signal and said timing signal for providing a leak signal; and said leak test means comprising: rate means for measuring the time rate of change of said pressure; means responsive to said rate means for providing said leak signal if the time rate of change of said pressure indicates that said system is leaking; parameter measuring means for measuring a parameter of said system; and sliding time scale means for adjusting a sliding window time scale of said rate means depending on said measured parameter.