Thermal resistance thermometer material - Temperature Measurement - Chongqing Instrument Materials Research Institute

	Dia mm	resistance ratio W(100℃)	resistance temperature coefficient α	Usage	Standard
Pt1	0.03~1.00	≥1.39254		Standard Pt Resistance Thermometer	GB/T5977 －1999
Pt2	0.02~1.00		0.003850±0.000004	A-Tolerance Pt RTD thermometer
Pt3	0.02~1.00		0.003850±0.000010	B-Tolerance Pt RTD thermometer
Pt4	≥0.30~1.00		≥0.003920	Standard Pt resistance thermometer lead, S or R type thermocouple negative etc.
Pt5	≥0.03~1.00		≥0.003840	Industrial Pt resistance thermometer lead and others

(2) FPt wire
FPt wire is metal product Pd wire surface covered with Pt coating by a special process, to replace the expensive Pt wire for thermal resistance thermometer as lead. Pt resistance thermometer and the thermal properties are not affected. FPt wire with 12%Pt, can save the consumption of Pt, thus reducing the cost of Pt resistance thermometer. The properties of FPt are as follows:

Performance Variety	Dia mm	Single weight g/m	Density g/cm3	δb,Mpa		Bending frequency		Standard
				75％cold working	annealed condition	75％cold working	annealed condition
FPt	0.50	2.5	13.00	340	210	10	16	Qn/ycs3-93
	0.45	2.0
Pt	0.50	4.21	21.46	250	130	10	16

(3) RhFe alloy wire（Rh-0.5at%Fe）

Diameter	Main performance	Characteristic and usage	Remark
0.03~0.05	W(R4.2/R273.16k)=0.71±0.005 Relative sensitivityβ4.2k=dR/dFR=6.5~7.5×10-2 R273.16k(at 4.2k) secular change 8×10－6~5× 10－5/year	High sensitivity, good stability, thermal resistance thermometer parts for 2 ~ 20K deep ultralow temperature precision measurement	supply agreement