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Model 325 Cryogenic Temperature Controller

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Sensor Selection

Typical Sensor Performance - click here for sample calculations of typical sensor performance

	Example Lake Shore sensor	Temp	Nominal resistance/ voltage	Typical sensor sensitivity⁷	Measurement resolution: temperature equivalents	Electronic accuracy: temperature equivalents	Temperature accuracy including electronic accuracy, CalCurve™, and calibrated sensor	Electronic control stability⁸: temperature equivalents
Silicon Diode	DT-670-SD-13 with 1.4H calibration	1.4 K	1.644 V	-12.49 mV/K	0.8 mK	±13 mK	±25 mK	±1.6 mK
		77 K	1.028 V	-1.73 mV/K	5.8 mK	±76 mK	±98 mK	±11.6 mK
		300 K	0.5597 V	-2.3 mV/K	4.4 mK	±47 mK	±79 mK	±8.8 mK
		500 K	0.0907 V	-2.12 mV/K	4.8 mK	±40 mK	±90 mK	±9.6 mK
Silicon Diode	DT-470-SD-13 with 1.4H calibration	1.4 K	1.6981 V	-13.1 mV/K	0.8 mK	±13 mK	±25 mK	±1.6 mK
		77 K	1.0203 V	-1.92 mV/K	5.2 mK	±69 mK	±91 mK	±10.4 mK
		300 K	0.5189 V	-2.4 mV/K	4.2 mK	±45 mK	±77 mK	±8.4 mK
		475 K	0.0906 V	-2.22 mV/K	4.6 mK	±39 mK	±89 mK	±9.2 mK
GaAlAs Diode	TG-120-SD with 1.4H calibration	1.4 K	5.391 V	-97.5 mV/K	0.2 mK	±7 mK	±19 mK	±0.4 mK
		77 K	1.422 V	-1.24 mV/K	16.2 mK	±180 mK	±202 mK	±32.4 mK
		300 K	0.8978 V	-2.85 mV/K	7 mK	±60 mK	±92 mK	±14 mK
		475 K	0.3778 V	-3.15 mV/K	6.4 mK	±38 mK	±88 mK	±12.8 mK
100 W Platinum RTD 500 W Ful Scale	PT-103 with 1.4J calibration	30 K	3.660 W	0.191 W/K	10.5 mK	±23 mK	±33 mK	±21 mK
		77 K	20.38 W	0.423 W/K	4.8 mK	±15 mK	±27 mK	±9.6 mK
		300 K	110.35 W	0.387 W/K	5.2 mK	±39 mK	±62 mK	±10.4 mK
		500 K	185.668 W	0.378 W/K	5.3 mK	±60 mK	±106 mK	±10.6 mK
Cernox™	CX-1050-SD-HT⁹ with 4M calibration	4.2 K	3507.2 W	-1120.8 W/K	36 µK	±1.4 mK	±6.4 mK	±72 µK
		77 K	205.67 W	-2.4116 W/K	16.6 mK	±76 mK	±92 mK	±33.2 mK
		300 K	59.467 W	-0.1727 W/K	232 mK	±717 mK	±757 mK	±464 mK
		420 K	45.030 W	-0.0829 W/K	483 mK	±1.42 K	±1.49 K	±966 mK
Germanium	GR-300-AA with 0.3D calibration	1.2 K	600 W	-987 W/K	51 µK	±345 µK	±4.5 mK	±101 µK
		1.4 K	449 W	-581 W/K	86 µK	±481 µK	±4.7 mK	±172 µK
		4.2 K	94 W	-27 W/K	1.9 mK	±5.19 mK	±10.2 mK	±3.8 mK
		100 K	2.72 W	-0.024 W/K	2.1 K	±4.25 K	±4.27 K	±4.20 K
Germanium	GR-1400-AA with 1.4D calibration	4 K	1873 W	-1008 W/K	50 µK	±842 µK	±5.0 mK	±99 µK
		4.2 K	1689 W	-862 W/K	58 µK	±900 µK	±5.1 mK	±116 µK
		10 K	253 W	-62 W/K	807 µK	±3.2 mK	±8.2 mK	±1.6 mK
		100 K	2.80 W	-0.021 W/K	2.4 K	±4.86 K	±4.884 K	±4.81 K
Carbon-Glass	CGR-1-2000 with 4L calibration	4.2 K	2260 W	-2060 W/K	20 µK	±0.5 mK	±4.5 mK	±40 µK
		77 K	21.65 W	-0.157 W/K	255 mK	±692 mK	±717 mK	±510 mK
		300 K	11.99 W	-0.015 W/K	2.667 K	±7 K	±7.1 K	±5.334 K
Thermocouple 50 mV	Type K	75 K	-5862.9 µV	15.6 µV/K	26 mK	±0.25 K¹⁰	Calibration not available from Lake Shore	±52 mK
		300 K	1075.3 µV	40.6 µV/K	10 mK	±0.038 K¹⁰		±20 mK
		600 K	13325 µV	41.7 µV/K	10 mK	±0.184 K¹⁰		±20 mK
		1505 K	49998.3 µV	36.006 µV/K	12 mK	±0.73 K¹⁰		±24 mK
⁷ Typical sensor sensitivities were taken from representative calibrations for the sensor listed ⁸ Control stability of the electronics only, in an ideal thermal system ⁹Non-HT version maximum temperature: 325 K ¹⁰ Accuracy specification does not include errors from room temperature compensation

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