CRYOGENIC TEMPERATURE SENSORS - Carbon-Glass RTD's - Technical Specifications

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Carbon Glass™ RTDs

Specifications

Standard curve Not applicable

Recommended excitation
10 mV (1.4 K to 325 K)

Dissipation at recommended excitation Typical 10^-7 W at 4.2 K

Thermal response time 1 s at 4.2 K;
1.5 s at 77 K in liquid

Radiation effects Recommended for use in ionizing radiation– click here for more information

Magnetic field Useful over the full temperature range and up to 30 tesla – click here for more information

Reproducibility¹ ±0.75 mK at 4.2 K ¹ Short-term reproducibility data is obtained by subjecting sensor to repeated thermal shocks
from 305 K to 4.2 K

Range of Use

	Minimum Limit	Maximum Limit
CGR-1-500	1 K	325 K
CGR-1-1000	1 K	325 K
CGR-1-2000	1 K	325 K

Calibrated Accuracy

	Typical sensor accuracy²	Long-term stability³
1.4 K	±4 mK	—
4.2 K	±4 mK	±5 mK
10 K	±5 mK	±30 mK
77 K	±25 mK	±100 mK
305 K	±105 mK	±600 mK

² [(Calibration uncertainty)² + (reproducibility)²] ^0.5 for more information see Appendices B, D, and E
³ Long-term stability data is obtained by subjecting sensor to 200 thermal shocks from 305 K to 77 K

Typical Resistance Values

	Typical resistance at 4.2 K
CGR-1-500	250 W to 750 W
CGR-1-1000	750 W to 1500 W
CGR-1-2000	1500 W to 3000 W


Temperature Response Data Table (typical)
	CGR-1-500			CGR-1-1000			CGR-1-2000
	R(W)	dR/dT (W/K)	(T/R)· (dR/dT)	R(W)	dR/dT (W/K)	(T/R)· (dR/dT)	R(W)	dR/dT (W/K)	(T/R)· (dR/dT)
1.4 K	103900	-520000	-6.9	342900	-1900000	-7.8	1401600	-8440000	-8.4
4.2 K	584.6	-422.3	-3.1	967.4	-802.8	-3.5	2260	-2060	-3.8
20 K	36.21	-1.77	-0.98	38.76	-2.183	-1.1	66.57	-4.05	-1.2
77 K	14.33	-0.213	-0.48	13.51	-0.093	-0.53	21.65	-0.157	-0.56
305 K	8.55	-0.0094	-0.33	7.66	-0.0090	-0.35	11.99	-0.015	-0.36
Click here for expanded response table


Physical Specifications
	Mass	Lead type	Internal atmosphere	Sensor materials
CGR AA package	417 mg	4 color coded phosphor bronze with heavy build polyimide insulation attached with epoxy strain relief at sensor	Helium 4 (⁴He) is standard	CGR temperature sensing element fabricated from a carbon-impregnated glass matrix, mount strain-free in a cylindrical gold plated copper can

Typical Magnetic Field-Dependent Temperature Errors⁴ ΔT/T (%) at B (magnetic induction)

Package Parallel to Field B
T(K)	2.5 T	8 T	14 T	19 T
4.2	2.9	3.8	3.7	2.8
30	0.2	0.2	0.3	0.3
78	<0.1	<0.1	0.17	0.16
300	-0.1	-0.1	-0.1	-0.1
⁴ Long axis parallel to applied field; negative ΔR/R when T > 60 K

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