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參數(shù)資料
| 型號： | IXR100 |
| 英文描述： | IXR100 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | IXR100 -已停產產品。不再推薦用于新設計。 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大小： | 138K |
| 代理商： | IXR100 |
IXR100
11
V
D
/
T = –2mV/
°
C. R
5
and R
6
form a voltage divider for
the diode voltage V
D
. The divider values are selected so that
the gradient
V
D
/
T equals the gradient of the thermo-
couple at the reference temperature. At +25
°
C this is
approximately –52
μ
V/
°
C (obtained from standard thermo-
couple table); therefore,
V
TC
/
T = (
V
D
/
T)(R
6
/(R
5
+ R
6
)) (2)
–52
μ
V/
°
C = (–2000
μ
V/
°
C)(R
6
/(R
5
+R
6
))
R
5
is chosen as 3.74k
to be much larger than the resistance
of the diode. Solving for R
6
yields 100
.
Transmit 4mA for T
l
= 0
°
C and 20mA for T
l
= +1000
°
C.
Note: V
lN
= V
IN+
– V
IN–
indicates that T
l
is relative to T
2
.
The input full scale span is 58mV. R
S
is found from
Equation (1) and equals 153.9
.
R
4
is chosen to make the output 4mA at T
TC
= 0
°
C (V
TC
=
1.28mV) and T
D
= 25
°
C (V
D
= 0.6V).
V
TC
will be –1.28mV when T
TC
= 0
°
C and the reference
junction is at +25
°
C. V
4
must be computed for T
D
= +25
°
C
to make V
IN
= 0V.
V
D(25
°
C)
= 600mV
V
IN(25
°
C)
= 600mV (100/3740) = 16.0mV
V
IN
= V
IN+
– V
IN–
= V
TC
+ V
4
– V
IN–
With V
IN
= 0 and V
TC
= –1.28mV,
V
4
= V
IN+
– V
TC
V
4
= 16.0mV – (–1.28mV)
0.4mA (R
4
) = 17.28mV
R
4
= 43.2
THERMOCOUPLE BURN-OUT INDICATION
In process control applications it is desirable to detect when
a thermocouple has burned out. This is typically done by
forcing the two-wire transmitter current to the upper or
lower limit when the thermocouple impedance goes very
high. The circuits of Figures 10, 11 and 12 inherently have
down scale indication. When the impedance of the thermo-
couple gets very large (open) the bias current flowing into
the + input (large impedance) will cause I
O
to go to its lower
range limit value (about 3.6mA). If up scale indication is
desired, the circuit of Figure 13 should be used. When the T
C
opens, the output will go to its upper range limit value (about
32mA or higher).
FIGURE 9. Pt100 RTD Without Linearization.
3
7
6
2
R
S
V
IN
+
+
–
IXR100
–
5
0.4mA
R
Z
RTD
0.4mA
R
0.01μF
D
1
1N4148
R
L
–
+
V
OUT
+V
S
4-20mA
4
1
28
18
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