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參數(shù)資料
| 型號(hào)： | IXR100 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Isolated, Self-Powered,Temperature Sensor Conditioning 4-20mA Two-Wire Transmitter(隔離的，自備電源的溫度傳感器4-20mA可兩線傳輸) |
| 中文描述： | 隔離，自供電，溫度傳感器調(diào)節(jié)的4 - 20mA雙線變送器（隔離的，自備電源的溫度傳感器的4 - 20mA可兩線傳輸） |
| 文件頁(yè)數(shù)： | 5/14頁(yè) |
| 文件大?。?/td> | 157K |
| 代理商： | IXR100 |
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IXR100
5
12
11
+
–
IXR100
10
10k
+
–
IXR100
5k
5k
(a)
(b)
±400μA adjust range
±40μA adjust range
12
11
10
R
L1
, R
L2
The resistor connected between these terminals determines
the gain of the linearization circuit and the amount of
correction applied to the RTD. Its value may be determined
in several ways. Two of which are shown as follows.
1. Empirically by interactively adjusting R
LIN
, R
S
and R
Z
to
achieve best fit 4 to 20mA output. R
Z
is used to set 4mA
at minimum input, R
S
is adjusted for 12mA with a half
span input, and R
LIN
is adjusted to give 20mA with a full
span input. This may require a few iterations but is
probably the most practical method for field calibration.
R
LIN
will range between 500
and 1500
for 100
sensors (Pt100, D100, SAMA). Initially it may seem a
little strange adjusting R
S
for 12mA and R
LIN
for 20mA.
However, convergence is achieved much more quickly as
the linearized curve passes through zero and has less
effect at the mid span and the linearity trim resistor tends
to adjust the transfer function more at the full span than
the mid point.
2. Using Table I and linear interpolation for values of span
not given in the table. This will yield very accurate results
for the Pt100 sensor and acceptable results for D100 and
SAMA sensors.
ZERO ADJUST (OPTIONAL) O
S1
, O
S2
, O
S3
The IXR100 has provision for adjusting the output offset
current as shown in Figure 2. In many applications the
already low offset will not need to be known at all. This trim
effects the V/I converter stage and does not introduce V
OS
drift errors that occur when the trim is performed at the input
stage. If possible use R
Z
to trim sensor output error to zero
and use the offset control to trim the output to 4mA when
V
IN
= 0V. The offset adjustment can be made with a
FIGURE 2. Basic Connection for Zero Adjust.
TABLE I. R
LIN
Values for Pt100 Sensor.
T
MIN
(
°
C)
–200
–150
–100
–50
50
100
200
300
400
500
600
700
800
900
1000
573
745
983
1233
653
855
1105
1284
839
1059
1228
1286
995
1158
1251
1262
1083
1197
1249
1236
1131
1206
1231
1208
1152
1205
1207
1180
1159
1196
1182
1152
1159
1175
1156
1125
1154
1151
1129
1097
1140
1127
0
1302
1263
1225
1188
1287
1249
1211
1174
1273
1220
1183
1146
1229
1192
1155
1119
1201
1164
1127
1091
1173
1136
1100
1064
1145
1108
1073
1038
1117
1081
1046
1011
1089
1054
50
100
150
200
250
300
350
1151
1114
1079
1044
1137
1101
1066
1031
1110
1074
1039
1005
1083
1048
1013
979
1056
1021
987
954
1030
995
962
928
1003
969
400
450
500
550
1009
975
942
909
996
963
930
897
971
938
905
873
946
913
881
849
921
888
600
650
700
750
800
877
845
814
784
754
865
834
803
773
841
810
NOTES: (1) Linear interpolation between two horizontal
or vertical values yields acceptable values. (2) Although
not optimum, these values will also yield acceptable
results with D100 and SAMA 100
nominal sensors.
(3) Double R
LIN
value for PT200.
SPAN
T (
°
C)
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