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    "ISO 5167-5 uncalibrated cone: Q = C E A √(2Δp/ρ); C=0.82; β=√(1−(d_c/D)²); A=(π/4) D² β²; incompressible ε=1; C is reported, not an input",
    "Re_D∈[8e4, 1.2e7] is the ISO envelope; β∈[0.45,0.75]; D∈[50 mm, 500 mm]; relative uncertainty of uncalibrated C is 5%",
    "Not ISA 1932 C(β,Re), not RHG orifice, not ISO 5167-4 type C, not long-radius C(β), not given C_d, not Q=Av, not Darcy f, not compressible ε"
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  "limitations": [
    "ISO 5167-5 uncalibrated cone: Q = C E A √(2Δp/ρ); C=0.82; β=√(1−(d_c/D)²); A=(π/4) D² β² annulus; incompressible ε=1; C is reported, not an input",
    "Uncalibrated C=0.82; Re_D∈[8e4, 1.2e7] is the ISO envelope; β∈[0.45,0.75]; D∈[50 mm, 500 mm]; larger cone lowers β",
    "Not ISA 1932 C(β,Re), not RHG orifice, not ISO 5167-4 type C, not long-radius C(β), not given C_d, not Q=Av, not Darcy f, not compressible ε"
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    "D outside [50 mm, 500 mm], β outside [0.45,0.75], or Re_D outside [8e4, 1.2e7] → VALUE_OUT_OF_RANGE",
    "C_d given, orifice d+D, nozzle D1+D2, tank H, A or v, Darcy f, μ, Cv/Kv, K, ε, tapping, kind=isa1932 or kind=machined → MIXED_INPUT_ENCODING",
    "mode=Cd or unknown mode → INVALID_MODE"
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    {
      "title": "ISO 80000-4 — Mechanics",
      "section": "Length, speed, pressure",
      "url": "https://www.iso.org/standard/31895.html",
      "supports": "D is a length; Q is a volume flow; Δp is a pressure",
      "kind": "standard"
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    {
      "title": "ISO 5167-5 — Measurement of fluid flow by means of pressure differential devices — Cone meters",
      "section": "Uncalibrated discharge coefficient",
      "url": "https://www.iso.org/standard/24442.html",
      "supports": "C=0.82; β=√(1−(d_c/D)²); D 50–500 mm; β 0.45–0.75; Re_D 8e4–1.2e7. Not ISA 1932, not RHG orifice, not ISO 5167-4 type C, not long-radius",
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