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Model 321 Cryogenic Temperature Controller

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The Model 321 temperature controller is obsolete and has been replaced by the new Model 325 temperature controller.

Sensor Selection

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

	Example Lake Shore Sensor	Temp	Nominal Resistance/ Voltage	Typical Sensor Sensitivity²	Measurement Resolution: Temperature Equivalents	Electronic Accuracy: Temperature Equivalents	Temperature Accuracy including Electronic Accuracy, CalCurve™, and Calibrated Sensor	Electronic Control Stability³: Temperature Equivalents
Model 321-01 Silicon Diode	DT-670-C0-13 with 1.4H calibration	1.4 K	1.644 V	-12.49 mV/K	3.3 mK	±42.4 mK	±54.4 mK	±6.6 mK
		77 K	1.028 V	-1.73 mV/K	23.1 mK	±234 mK	±246 mK	±46.2 mK
		300 K	0.5597 V	-2.3 mV/K	17.4 mK	±135 mK	±167 mK	±34.8 mK
		500 K	0.0907 V	-2.12 mV/K	18.9 mK	±103 mK	±153 mK	±37.8 mK
Model 321-01 Silicon Diode	DT-470-SD-13 with 1.4H calibration	1.4 K	1.6981 V	-13.1 mV/K	3.1 mK	±41.2 mK	±53.2 mK	±6.2 mK
		77 K	1.0203 V	-1.92 mV/K	20.8 mK	±210 mK	±232 mK	±41.6 mK
		300 K	0.5189 V	-2.4 mV/K	16.7 mK	±127 mK	±159 mK	±33.4 mK
		475 K	0.0906 V	-2.22 mV/K	18.0 mK	±98.3 mK	±148 mK	±36.0 mK
Model 321-02 100 W Platinum RTD 300 W Full Scale	PT-103 with 1.4J calibration	30 K	3.660 W	0.191 W/K	26.2 mK	±115 mK	±125 mK	±52.4 mK
		77 K	20.38 W	0.423 W/K	11.9 mK	±72 mK	±84 mK	±23.8 mK
		300 K	110.35 W	0.387 W/K	13 mK	±195 mK	±218 mK	±26 mK
		500 K	185.668 W	0.378 W/K	14 mK	±299 mK	±345 mK	±28 mK
Model 321-04⁴ Thermocouple 45 mV	Chromel vs AuFe 0.07%	2 K	-5292 µV	10.1 µV/K	149 mK	±658 mK⁵	Calibration not available from Lake Shore	±298 mK
		300 K	597.44 µV	22.4 µV/K	67 mK	±192 mK⁵		±134 mK
		600 K	7470.7 µV	23.4 µV/K	65 mK	±331 mK⁵		±130 mK
² Typical sensor sensitivities were taken from representative calibrations for the sensor listed ³ Control stability of the electronics only, in an ideal thermal system ⁴ All thermocouple data is for uncompensated inputs ⁵ Accuracy specification does not include errors from room temperature compensation

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