Lake Shore 218, User Manual

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Lake Shore Model 218 Temperature Monitor User’s Manual
Introduction 1-5
Table 1-2. Model 218 Sensor Input Performance Chart
Sensor Type Silicon Diode GaAlAs Diode
100
Ω
Platinum RTD
500
Ω
Full Scale
1000
Ω
Platinum RTD Cernox™ RTD
Temperature Coefficient Negative Negative Positive Positive Negative
Sensor Units Volts (V) Volts (V) Ohms (
Ω
) Ohms (
Ω
) Ohms (
Ω
)
Input Range 0 to 2.5 V 0 to 7.5 V 0 to 500
Ω
0 to 5000
Ω
0 – 7500
Ω
Sensor Excitation
(Constant Current)
10 µA ±0.01% 10 µA ±0.01% 1 mA ±0.3% 1 mA ±0.3% 10 µA ±0.01%
Display Resolution
(Sensor Units)
100 uV 100 uV 10 m
Ω
100 m
Ω
100 m
Ω
Example LSCI Sensor
DT-470-CO-13 with
1.4H Cal.
TG-120SD with 1.4H Cal. PT-103 with 14J Cal. PT-1001
2
with 1.4J Cal. CX-1050-SD with 4L Cal.
Temperature Range 1.4 – 475 K 1.4 – 475 K 30 – 800 K 30 – 800 K 3.5 – 400 K
Standard Sensor Curve LSCI Curve 10 Requires Calibration DIN 43760 Scaled from DIN 43670 Requires calibration
Typical Sensor
Sensitivity
-30 mV/K at 4.2 K
-1.9 mV/K at 77 K
-2.4 mV/K at 300 K
-2.2 mV/K at 475 K
-180 mV/K at 10 K
-1.25 mV/K at 77 K
-2.75 mV/K at 300 K
-2.75 mV/K at 475 K
0.19
Ω
/K at 30 K
0.42
Ω
/K at 77 K
0.39
Ω
/K at 300 K
0.35
Ω
/K at 675 K
0.33
Ω
/K at 800 K
1.9
Ω
/K at 30 K
4.2
Ω
/K at 77 K
3.9
Ω
/K at 300 K
3.3
Ω
/K at 800 K
-770
Ω
/K at 4.2 K
-1.5
Ω
/K at 77 K
-0.1
Ω
/K at 300 K
Measurement Resolution:
Sensor Units
Temperature Equivalence
20 uV
1 mK at 4.2 K
11 mK at 77 K
10 mK at 300 K
10 mK at 475 K
20 uV
1 mK at 10 K
16 mK at 77 K
10 mK at 300 K
10 mK at 475 K
2 m
Ω
10.6 mK at 30 K
10 mK at 77 K
10 mK at 300 K
10 mK at 675 K
10 mK at 800 K
20 m
Ω
10.6 mK at 30 K
10 mK at 77 K
10 mK at 300 K
10 mK at 800 K
50 m
Ω
1 mK at 4.2 K
33.3 mK at 77 K
500 mK at 300 K
Electronic Accuracy:
Sensor Units
Temperature Equivalence
±160 uV ±0.01% RDG
±11 mK at 4.2 K
±138 mK at 77 K
±88 mK at 300 K
±77 mK at 475 K
±160 uV ±0.02% RDG
±6 mK at 10 K
±300 mK at 77 K
±150 mK at 300 K
±110 mK at 475 K
±0.004
Ω
±0.02% RDG
±25 mK at 30 K
±18 mK at 77 K
±70 mK at 300 K
±162 mK at 675 K
±187 mK at 800 K
±0.06
Ω
±0.04% RDG
±40 mK at 30 K
±33 mK at 77 K
±135 mK at 300 K
±370 mK at 800 K
±0.1
Ω
±0.04% RDG
±1 mK at 4.2 K
±88 mK at 77 K
±1.144 K at 300K
Temperature Accuracy
including electronic
accuracy, CalCurve™
and calibrated sensor
±31 mK at 4.2 K
±193 mK at 77 K
±138 mK at 300 K
±177 mK at 475 K
±21 mK at 10 K
±390 mK at 77 K
±140 mK at 300 K
±210 mK at 475 K
±45 mK at 30 K
±38 mK at 77 K
±105 mK at 300 K
±262 mK at 675 K
±287 mK at 800 K
±60 mK at 30 K
±53 mK at 77 K
±170 mK at 300 K
±470 mK at 800 K
±9 mK at 4.2 K
1
±138 mK at 77 K
1
±1.284 K at 300K
1
Magnetic Field Use
Recommended for
T > 60 K & B < 3 T
Recommended for
T > 4.2 K & B < 5 T
Recommended for
T > 40 K & B < 2.5 T
Recommended for
T > 40 K & B < 2.5 T
Recommended for
T > 2 K & B < 19 T
1
Specified accuracy includes no effects of thermal EMF voltages. An error of 3 m
Ω
results from each 1 µV of thermal EMF voltage. In well-designed systems, thermal EMF voltage should be less than 10 µV.
2
No longer available from Lake Shore.