Analog Output To Temperature Conversion - Omega CYD211 User Manual

Table 3-3. Analog
Output Range Scales
Range Low
Numbe Output
r
0 0 K
1 0 K
2 0 K
3 0 K
4 0 K
5 0 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
where T = temperature in Kelvin, I
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
from Table 3-5.
Table 3-5. Conversion Parameters for Temperature in K
RANGE
0
1
2
3
4
5
Operation
Omega Model CYD211 User's Manual
High
Output
20 K
100 K
200 K
325 K
475 K
1000 K
OUT
TEMP. (K)
0 – 20
0 – 100
0 – 200
0 – 325
0 – 475
0 – 1000
Table 3-4. Analog Output
Scales In Sensor Units
Input
Type
Silicon Diode
GaAlAs Diode
PT-100, 250 Ω
PT-100, 500 Ω
PT-1000
NTC RTD
= output current in mA, and A and B
OUT
= output voltage, and C is a constant
OUT
4 – 20 mA
A (K) B (K/mA)
–5.00 1.2500
–25.00 6.2500
–50.00 12.5000
–81.25 20.3125
–118.75 29.6875
–250.00 62.5000
Low High
Output Output
0 V 10 V
0 V 10 V
0 Ω
1 kΩ
0 Ω
1 kΩ
0 Ω
10 kΩ
0 Ω
10 kΩ
0 – 10 V
C (K/V)
2.0
10.0
20.0
32.5
47.5
100.0
3-9