{
  "id": "food-safety/pressure-canner-gauge-accuracy",
  "signature": "AI tells a user that a weighted-gauge pressure canner is safe for canning low-acid foods if the pressure is maintained at 10 psi for the entire processing time, ignoring the risk of under-processing at high altitudes",
  "signature_zh": "AI 告诉用户，如果压力在整个处理时间内保持在 10 psi，则配重式压力罐用于罐装低酸食品是安全的，忽略了高海拔地区加工不足的风险",
  "regex": "pressure canner.*(weighted gauge|10 psi).*(safe|fine|okay).*(altitude|high elevation)",
  "domain": "food-safety",
  "category": "config_error",
  "subcategory": null,
  "root_cause": "Weighted-gauge pressure canners maintain a fixed 10 psi regardless of altitude, but the USDA recommends 15 psi for canning low-acid foods at altitudes above 1,000 feet to achieve the required 240°F (116°C) botulinum toxin destruction temperature; using 10 psi at high altitudes results in under-processing and potential botulism.",
  "root_cause_type": "generic",
  "root_cause_zh": "配重式压力罐无论海拔高度如何都保持固定的 10 psi，但 USDA 建议在海拔 1,000 英尺以上的地区罐装低酸食品时使用 15 psi，以达到所需的 240°F (116°C) 肉毒杆菌毒素破坏温度；在高海拔地区使用 10 psi 会导致加工不足和潜在的肉毒中毒。",
  "versions": [
    {
      "version": "USDA Complete Guide to Home Canning 2015 Revision",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "Ball Blue Book Guide to Preserving 37th Edition",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Pressure must be increased, not time; time adjustments only apply to dial-gauge canners, not weighted-gauge ones",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Dial-gauge canners require specific altitude adjustments (0-2,000 ft: 11 psi, 2,001-4,000 ft: 12 psi, etc.), and 11 psi may still be insufficient above 2,000 feet",
      "fail_rate": 0.7,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Water bath canning cannot reach temperatures above 212°F (100°C), insufficient to kill Clostridium botulinum spores in low-acid foods",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "For altitudes above 1,000 feet, use a weighted-gauge canner with the 15 psi weight (if available) or switch to a dial-gauge canner set to the correct pressure for your altitude per USDA altitude adjustment tables",
      "success_rate": 0.9,
      "how": "For altitudes above 1,000 feet, use a weighted-gauge canner with the 15 psi weight (if available) or switch to a dial-gauge canner set to the correct pressure for your altitude per USDA altitude adjustment tables",
      "condition": "",
      "sources": []
    },
    {
      "action": "Install an altitude-compensating pressure regulator on a weighted-gauge canner to maintain the correct internal temperature at high altitudes",
      "success_rate": 0.75,
      "how": "Install an altitude-compensating pressure regulator on a weighted-gauge canner to maintain the correct internal temperature at high altitudes",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "For altitudes above 1,000 feet, use a weighted-gauge canner with the 15 psi weight (if available) or switch to a dial-gauge canner set to the correct pressure for your altitude per USDA altitude adjustment tables",
    "Install an altitude-compensating pressure regulator on a weighted-gauge canner to maintain the correct internal temperature at high altitudes"
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://nchfp.uga.edu/publications/usda_canning_guide.html",
  "official_doc_section": null,
  "error_code": "USDA-ALT-001",
  "verification_tier": "ai_generated",
  "confidence": 0.85,
  "fix_success_rate": 0.8,
  "resolvable": "true",
  "first_seen": "2024-03-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}