Precious metals S, R, B type fast thermocouple wire - Industrial thermocouple wire - Temperature Measurement - Chongqing Instrument Materials Research Institute

● Classification and grade:
Carbon-identification (D) and temperature (C) categories. Each category according to thermal properties, tolerance and even emf, is divided into S and R type withⅠ,Ⅱgrade, B type withⅠ, Ⅱ, Ⅲ grade.

● Size tolerance and single wire weight

Dia mm	Tolerance mm	Out-of-roundness ≤mm	Single wire weight ≤g
0.100	±0.004	0.004	25
0.080	±0.003	0.003	20
0.070	±0.002	0.002	15
Note: If the user need, to allow the supply of single wire weight less than standard.

● Uneven thermo-emf
Each axis of wire, the reference side temperature at 0℃, measurement end temperature of palladium point (1554.8 ℃).

Wire material	uneven thermo-emf μV ≤
Wire material	carbon-identification wire	Ⅰ	Ⅱ
Pt	2	3	5
PtRh6	9	10	20
PtRh 10	7	8	14
PtRh 13	7	8	16
PtRh 30	7	8	16

● Thermo-emf and tolerance
PtRh10-Pt, PtRh13-Pt and PtRh30-PtRh6 thermocouple wire, when the reference side temperature ℃, gold point and palladium-point value of thermal emf and tolerance.

Type	Measurement end temperature℃	Thermal emf standard valueμV	Classification	Tolerance ±μV			Temperature ℃
Type	Measurement end temperature℃	Thermal emf standard valueμV	Classification	Ⅰ	Ⅱ	Ⅲ	Ⅰ	Ⅱ	Ⅲ
S	1064.18	10 334	D	12	－	－	±1	－	－
	1064.18	10 334	C	24	31	－	±2	±2.6	―
	1554.8	16 239	D	12	－	－	±1	－	－
	1554.8	16 239	C	24	36	－	±2	±3	－
R	1064.18	11 364	D	13	－	－	±1	－	－
	1064.18	11 364	C	27	36	－	±2	±2.6	－
	1554.8	18 219	D	14	－	－	±1	－	－
	1554.8	18 219	C	28	42	－	±2	±3	－
B	1064.18	5 434	D	10	－	－	±1	－	－
	1064.18	5 434	C	20	29	38	±2	±3	±4
	1554.8	10 735	D	18	－	－	±1.5	－	－
	1554.8	10 735	C	24	36	48	±2	±3	±4
Note: if requested, to allow the supply of ± 0.5 ℃ high-precision wire