Measuring Devices

Bell prover

Instruments used to determine volume, distance, dimensions, and time are all measuring devices. The device that people are most familiar with is the gas pump. Inside the cabinet is a meter that determines the quantity of fuel dispensed. Standards Specialists test each meter by dispensing five gallons at the fast (or open) speed then five gallons at the slow (restricted) speed into calibrated measures, compare the monetary computations, check that the tamper-proof seal on the meter adjustment is intact, and other details required in the Examination Procedure Outline (EPO) distributed by Measurement Standards. Other measuring devices include wire and rope meters, retail water meters, oil meters and propane meters.

Utility meters used in mobile home parks such as electric and gas are routinely tested. Each examination tests the meters ability to accurately register at full and light loads and other specifications (as outlined in the EPO). The installation of the meter directly affects performance. Wiring and meter connections are vital to correct metering of electricity, while plumbing and level installations of gas vapor and water meters are important to their accuracy. The computations of bills using correct rate schedules is also verified.

Calibrations can be either dry or liquid. We test our field standards against our office standards to maintain a chain of accuracy. Our standards are verified by California Measurements periodically for accuracy.

All commercial measuring devices must be registered with the county prior to use.