Lakeshore 211 - Analog Output to Temperature Conversion

Lake Shore Model 211 User’s Manual
Operation 3-
9
Analog Output Setup (Continued)
Table 3-3. Analog Table 3-4. Analog Output
Output Range Scales Scales In Sensor Units
Range
Number
Low
Output
High
Output
Input
Type
Low
Output
High
Output
0
0 K
20 K
Silicon Diode
0 V
10 V
1
0 K
100 K
GaAlAs Diode
0 V
10 V
2
0 K
200 K
PT-100, 250 
0 
1 k
3
0 K
325 K
PT-100, 500 
0 
1 k
4
0 K
475 K
PT-1000
0 
10 k
5
0 K
1000 K
NTC RTD
0 
10 k
3.9 ANALOG OUTPUT TO TEMPERATURE CONVERSION
The output current or voltage is directly proportional to the temperature
reading. For the 4 – 20 mA output, the following formula converts output
current to temperature:
T = A + B × I
OUT
where T = temperature in kelvin, I
OUT
= output current in mA, and A and B
are constants from Table 3-5.
For the 0 – 10 V output, the following formula converts output voltage to
temperature:
T = C × V
OUT
where T = temperature in kelvin, V
OUT
= output voltage, and C is a constant
from Table 3-5.
Table 3-5. Conversion Parameters for Temperature in K
4 – 20 mA
0 – 10 V
RANGE
TEMP. (K)
A (K) B (K/mA)
C (K/V)
0
0 – 20
–5.00 1.2500
2.0
1
0 – 100
–25.00 6.2500
10.0
2
0 – 200
–50.00 12.5000
20.0
3
0 – 325
–81.25 20.3125
32.5
4
0 – 475
–118.75 29.6875
47.5
5
0 – 1000
–250.00 62.5000
100.0