{
  "name": "Thermocouple type × sheath material chart (K, N, J, E, T, R, S, B, C against ceramic and metal tubes)",
  "description": "Nine thermocouple types against eight sheath and protection-tube materials (C 799 alumina, C 610 mullite, C 530 porous, and five steels and alloys). Each row gives the type's published upper figures, the tube material's published upper figures by source, the lower of the two in °C, which part sets it, and the rule a named source (WIKA, JUMO, Rössel, Omega) gives for that pair. Every figure is the named source's, not a GY rating.",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "credit": "Source: GY Alumina (gyalumina.com), CC BY 4.0",
  "creator": "GY Alumina",
  "url": "https://gyalumina.com/resources#data-type-sheath-chart",
  "guide": "https://gyalumina.com/guides/thermocouple-types-temperature-ranges#type-sheath-chart",
  "dateModified": "2026-10-16",
  "columns": [
    {
      "key": "thermocouple_type",
      "description": "Thermocouple type letter"
    },
    {
      "key": "type_upper_c",
      "description": "Type's published upper figures, °C: IEC 60584-1 class 2 and ASTM E230 as tabled by WIKA TE 65.80 (type T: ASTM via Tempco), type C: Omega"
    },
    {
      "key": "sheath",
      "description": "Sheath or protection tube material"
    },
    {
      "key": "sheath_upper_c",
      "description": "Material's published upper figures, °C, by source (WIKA, DIN 43724 as tabled by Morgan, Rössel, Endress+Hauser, Omega)"
    },
    {
      "key": "limit_c",
      "description": "Lower of the type's and the tube's published figures, °C (a range where sources differ)"
    },
    {
      "key": "set_by",
      "description": "Which part sets the limit: thermocouple, tube, or either, by source"
    },
    {
      "key": "rule",
      "description": "Rule a named source gives for this pair"
    },
    {
      "key": "rule_source",
      "description": "Who gives the rule"
    },
    {
      "key": "cell_text",
      "description": "The chart cell as printed in the guide's PDF"
    }
  ],
  "rows": [
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "1,200–1,260",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "1,200–1,260 °C (thermocouple)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "1,200–1,260",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "1,200–1,260 °C (thermocouple)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "1,200–1,260",
      "set_by": "thermocouple",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,200–1,260 °C (thermocouple); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "800",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "800 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "1,100–1,200 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "1,100–1,150",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "1,100–1,150 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "1,200",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "1,200 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "K",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "",
      "rule_source": "",
      "cell_text": "1,100–1,200 °C (tube)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "1,200–1,260",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "1,200–1,260 °C (thermocouple)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "1,200–1,260",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "1,200–1,260 °C (thermocouple)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "1,200–1,260",
      "set_by": "thermocouple",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,200–1,260 °C (thermocouple); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "800",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "800 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "1,100–1,200 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "1,100–1,150",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "1,100–1,150 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "1,200",
      "set_by": "tube",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "1,200 °C (tube); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "N",
      "type_upper_c": "IEC cl. 2 1,200 · ASTM 1,260",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "",
      "rule_source": "",
      "cell_text": "1,100–1,200 °C (tube)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "750–760 °C (thermocouple)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "750–760 °C (thermocouple)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "750–760 °C (thermocouple); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "750–760 °C (thermocouple); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "750–760 °C (thermocouple); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "750–760 °C (thermocouple); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "Usual pairing",
      "rule_source": "WIKA",
      "cell_text": "750–760 °C (thermocouple); Usual pairing (WIKA)"
    },
    {
      "thermocouple_type": "J",
      "type_upper_c": "IEC cl. 2 750 · ASTM 760",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "750–760",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "750–760 °C (thermocouple)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "870–900 °C (thermocouple)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "870–900 °C (thermocouple)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "870–900 °C (thermocouple); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "800",
      "set_by": "tube",
      "rule": "",
      "rule_source": "",
      "cell_text": "800 °C (tube)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "870–900 °C (thermocouple)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "870–900 °C (thermocouple)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "870–900 °C (thermocouple)"
    },
    {
      "thermocouple_type": "E",
      "type_upper_c": "IEC cl. 2 900 · ASTM 870",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "870–900",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "870–900 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "370 °C (thermocouple); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "T",
      "type_upper_c": "ASTM 370",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "370",
      "set_by": "thermocouple",
      "rule": "",
      "rule_source": "",
      "cell_text": "370 °C (thermocouple)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "1,480–1,600",
      "set_by": "thermocouple",
      "rule": "Recommended",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,480–1,600 °C (thermocouple); Recommended (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "",
      "set_by": "",
      "rule": "Not recommended",
      "rule_source": "JUMO",
      "cell_text": "Not recommended (JUMO)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "1,350–1,600",
      "set_by": "either, by source",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,350–1,600 °C (either, by source); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "800",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "800 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "1,100–1,150",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,150 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "R",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "1,480–1,600",
      "set_by": "thermocouple",
      "rule": "Recommended",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,480–1,600 °C (thermocouple); Recommended (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "",
      "set_by": "",
      "rule": "Not recommended",
      "rule_source": "JUMO",
      "cell_text": "Not recommended (JUMO)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "1,350–1,600",
      "set_by": "either, by source",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,350–1,600 °C (either, by source); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "800",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "800 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "1,100–1,150",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,150 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "S",
      "type_upper_c": "IEC cl. 2 1,600 · ASTM 1,480",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "1,600–1,700",
      "set_by": "either, by source",
      "rule": "Recommended",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,600–1,700 °C (either, by source); Recommended (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "",
      "set_by": "",
      "rule": "Not recommended",
      "rule_source": "JUMO",
      "cell_text": "Not recommended (JUMO)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "1,350–1,600",
      "set_by": "tube",
      "rule": "Outer tube only",
      "rule_source": "WIKA, JUMO",
      "cell_text": "1,350–1,600 °C (tube); Outer tube only (WIKA, JUMO)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "800",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "800 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "1,100–1,150",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,150 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "B",
      "type_upper_c": "IEC cl. 2 1,700 · ASTM 1,700",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "1,100–1,200",
      "set_by": "tube",
      "rule": "With ceramic inner tube",
      "rule_source": "Rössel",
      "cell_text": "1,100–1,200 °C (tube); With ceramic inner tube (Rössel)"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "C 799 alumina",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,600 · Rössel 1,600 · E+H 1,800",
      "limit_c": "",
      "set_by": "",
      "rule": "Not rated by these sources",
      "rule_source": "",
      "cell_text": "Not rated by these sources"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "C 610 mullite",
      "sheath_upper_c": "WIKA 1,500 · DIN 43724 (Morgan) 1,400 · Rössel 1,600 · E+H 1,500",
      "limit_c": "",
      "set_by": "",
      "rule": "Not rated by these sources",
      "rule_source": "",
      "cell_text": "Not rated by these sources"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "C 530 (porous)",
      "sheath_upper_c": "WIKA 1,600 · DIN 43724 (Morgan) 1,350 · Rössel 1,500 · E+H 1,400",
      "limit_c": "",
      "set_by": "",
      "rule": "Not rated by these sources",
      "rule_source": "",
      "cell_text": "Not rated by these sources"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "1.4571 (316Ti)",
      "sheath_upper_c": "WIKA 800 · Rössel 800",
      "limit_c": "",
      "set_by": "",
      "rule": "Not in air (Omega)",
      "rule_source": "",
      "cell_text": "Not in air (Omega)"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "1.4841 (310/314)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,200 · E+H 1,100",
      "limit_c": "",
      "set_by": "",
      "rule": "Not in air (Omega)",
      "rule_source": "",
      "cell_text": "Not in air (Omega)"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "1.4749 (446)",
      "sheath_upper_c": "WIKA 1,150 · Rössel 1,100 · E+H 1,100",
      "limit_c": "",
      "set_by": "",
      "rule": "Not in air (Omega)",
      "rule_source": "",
      "cell_text": "Not in air (Omega)"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "1.4762",
      "sheath_upper_c": "WIKA 1,200 · Rössel 1,200",
      "limit_c": "",
      "set_by": "",
      "rule": "Not in air (Omega)",
      "rule_source": "",
      "cell_text": "Not in air (Omega)"
    },
    {
      "thermocouple_type": "C",
      "type_upper_c": "Omega 2,315 (hydrogen, inert gas, vacuum)",
      "sheath": "Inconel 600",
      "sheath_upper_c": "E+H 1,100 · Omega 1,149 · Rössel 1,200",
      "limit_c": "",
      "set_by": "",
      "rule": "Not in air (Omega)",
      "rule_source": "",
      "cell_text": "Not in air (Omega)"
    }
  ]
}