Orifice plate · gas
ISO 5167-2 + AGA8
MetriSigma
Build reproducible uncertainty budgets, linked to your instruments and traceable for audits.
AM
Verified case · ISO 5167-2 Verified calculation
6 canonical models 01 02 Available 03 Available 04 Available 05 Available 06 Available No generative AI Assisted OCR
Orifice plate · gas
Fiscal system / Measurement train 01
Measurement modelISO 5167-2 + AGA8
qb = f(d, D, Δp, ρo, ρb, Cd, ε) GUM budgetSources connected to the model
QuantityValueStandard u
d Orifice diameter76.55 mm0.005 mm
D Pipe diameter154.05 mm0.010 mm
Δp Differential pressure28.40 kPa0.050 kPa
ρo Operating density21.84 kg/m³0.050 kg/m³
Expanded uncertainty0.7453 %
U · k = 2 · verified contractual case
- Base flow rate
- 356,341.94 m³/d
- Relative uc
- 0.3727 %
Case source: versioned engine contract
orifice_gas_gum.json Hierarchies
Organise each system within the real structure of the installation.
01North Terminal
02Measurement yard
03Measurement train 01Orifice plate · gas
04Measurement train 02Ultrasonic · gas
Selected system
Measurement train 01
- Model
- Orifice plate
- Instruments
- 4 linked
- Last calculation
- Verified contract
- Signature
- Available per snapshot
Instruments
Physical equipment, certificates and effective sources linked to the system.
| Tag | Type | Symbol | Evidence | Sources |
|---|---|---|---|---|
| FE-101 | Primary element | d · D | Certificate | Dimensional |
| PDT-101 | Differential transmitter | Δp | Linked | Calibration · drift |
| PT-101 | Pressure transmitter | p | To review | Calibration |
| TT-101 | Temperature transmitter | T | Linked | Calibration · resolution |
Measurement systems
The symbolic engine extends technologies by adding models and symbols, not parallel logic.
Active
Venturi · gas
ISO 5167-4 + AGA8
Ultrasonic · gas
AGA9 / ISO 17089-1
Turbine · liquid
API MPMS 5.3
Coriolis
ISO 10790
Static · liquid
Tank and fluid properties
Alerts
Prioritise systems by fiscal limit, evidence validity and calculation status.
Result over the fiscal limit
The latest snapshot needs a metrological review before it is signed.
Technical risk · action requiredEvidence pending confirmation
A value extracted by OCR has not yet been validated by the user.
Document · human reviewModel ready to recalculate
A source linked to the instrument was updated.
Traceability · change detectedMetrological copilot
Deterministic rules that explain the result without hiding the reasoning.
Reading the budget
First review the quantities with the largest contribution to the variance.
The recommendation is computed on the GUM and Monte Carlo result. Each signal keeps the rule that produced it and opens the data point the metrologist should review.
- 01GUM / MCM consistencyMethod validation
- 02Margin to the limitProbabilistic risk
- 03Dominant sourcesImprovement opportunity
Measurement models
Equations, symbols and units managed as catalogue data.
Active equation
q_b = f(d, D, Δp, ρ_o, ρ_b, C_d, ε) - Symbols
- 7 quantities
- Engine
- Dynamic SymPy
- Methods
- GUM + MCM
- Reference
- ISO 5167-2
Source library
Reusable profiles per quantity and instrument-specific sources.
Calibration certificate
NormalDeclared uncertainty · k
Instrument model
RectangularAccuracy on the reading
Operating condition
ParametricCoefficient per ΔCond
Documents
Extract certificates and apply only the fields confirmed by the user.
Calibration certificate
Upload a PDF to identify results, uncertainty and instrument data.
Check before applying
- 1 Extract
OCR on the original document
- 2 Cross-check
Value, unit, k and evidence
- 3 Confirm
The user accepts or corrects
- 4 Link
Instrument, symbol and source
Administration
Users, tenants and permissions over an isolated multi-company operation.
Users and roles
Access by profile, company and review scope.
Metrology · Operation · AdministrationTenants
Data, catalogues and hierarchies separated by organisation.
Isolation by contextMetrological signature
Snapshots signed with identity, date and reproducible result.
Decision traceabilityYou define the model. MetriSigma calculates and decides.
- 1
You
Define your model
Create a model or select a predefined one for your equipment or system. Upload your documentation and link input quantities, instruments, data and uncertainty sources manually or automatically.
- 2
MetriSigma
GUM calculation
Combines Type A and B evaluations, sensitivity coefficients, correlations and degrees of freedom to obtain combined and expanded uncertainty.
JCGM 100:2008
- 3
MetriSigma
Monte Carlo
Propagates input distributions and compares the GUM result with the simulated interval at the specified coverage probability.
JCGM 101:2008
- 4
MetriSigma
Decision support
Identifies the largest contributors to uncertainty. The metrology agent helps you interpret results and guide improvements to instruments and measurement conditions.
Direct contact with experts
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We bring together metrology management, uncertainty analysis and specialist engineering to address your measurement challenges.