Measurement Uncertainty: pressure_bourdon_gauge
GUM-compliant measurement uncertainty budget components and coverage factors for common engineering measurements. Covers Type A (statistical) and Type B (non-statistical) uncertainty sources with standard uncertainties, expanded uncertainties at k=2 (95%), and confidence levels for: length/dimension (caliper, micrometer, CMM, gauge block), mass (analytical balance, platform scale), temperature (Type K thermocouple, Pt100 RTD, IR pyrometer), pressure (Bourdon gauge, electronic transducer, liquid manometer), flow (orifice plate, turbine meter, Coriolis, ultrasonic transit-time), electrical (DMM, power analyzer), force (load cell), and torque (torque wrench). Also includes coverage factor reference rows (k=1/2/3, 68/95/99.7%) and distribution divisors (rectangular, triangular, normal, U-shaped). Per ISO/IEC Guide 98-3:2008 (GUM), NIST TN 1297, ISO/IEC 17025:2017.
| measurement type | uncertainty source | confidence level pct (%) | coverage factor k | distribution | divisor | expanded uncertainty k2 | expanded uncertainty unit | notes | standard uncertainty unit | standard uncertainty value | uncertainty type |
|---|---|---|---|---|---|---|---|---|---|---|---|
| pressure_bourdon_gauge | accuracy_class | 95 | 2 | rectangular | 1.732 | 0.58 | pct_FS | Bourdon gauge ASME B40.100 Grade 2A: accuracy +/-0.5% FS; half-interval 0.25%; u = 0.25/sqrt(3) = 0.144% FS; Grade 1A: +/-1% FS; reported as combined 0.29% FS | pct_FS | 0.29 | Type_B |
| pressure_bourdon_gauge | calibration | 95 | 2 | normal | 2 | 0.4 | pct_FS | Deadweight tester calibration uncertainty; U95 = 0.05-0.1% FS for good deadweight tester; expanded to 0.20% FS for field gauge calibration lab | pct_FS | 0.2 | Type_B |
| pressure_bourdon_gauge | combined_standard_uncertainty | 95 | 2 | normal | 1 | 0.76 | pct_FS | RSS: sqrt(0.29^2+0.14^2+0.20^2+0.10^2) = 0.38% FS; U95 = 0.76% FS; combined Bourdon gauge measurement uncertainty | pct_FS | 0.38 | Combined |
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