Monitor for fluid dispensing system

摘要

A fluid dispensing monitor utilizes a sensor for detecting a characteristic of fluid flow through the dispenser, for example, fluid nozzle pressure. The monitor periodically samples an input signal produced by the sensor and compares sampled values to stored alarm limit values. Warning error codes are produced in response to predetermined relationships between the sampled values and the stored alarm limits values. The monitor further samples the fluid flow characteristic during the transition times during which the dispensing gun is being turned ON or turned OFF. The monitor produces error codes in response to transition times and pressures exceeding predetermined limits. Error codes are also produced in response to changes in static fluid pressure. The monitor further executes automatic calibration and diagnostic processes. The monitoring system includes a plurality of sensors (50, 210, 212), a plurality of monitoring controls (14, 214, 216) and an operator control (220).