參數(shù)資料
型號： XTR114
英文描述： 4-20mA CURRENT TRANSMITTERS with Sensor Excitation and Linearization
中文描述： 的4 - 20mA的傳感器激勵和線性電流遞質(zhì)
文件頁數(shù)： 10/16頁
文件大?。?/td> 255K
代理商： XTR114
10
XTR112, XTR114
R
2
= RTD resistance at maximum measured temperature, T
MAX
R
LIN
= 1k
(internal)
where R
Z
= RTD resistance at the minimum measured temperature, T
MIN
R
1
= RTD resistance at the midpoint measured temperature, T
MID
= (T
MIN
+ T
MAX
)/2
XTR112 RESISTOR EXAMPLE:
The measurement range is –100
°
C to +200
°
C for a 3-wire Pt100 RTD connection. Determine the values for R
S
, R
G
, R
LIN1
, and R
LIN2
. Look up the values
from the chart or calculate the values according to the equations provided.
METHOD 1: TABLE LOOK UP
T
MIN
= –100
°
C and
T = 300
°
C (T
MAX
= +200
°
C),
Using Table II the 1% values are:
R
Z
= 604
R
G
= 750
R
LIN1
= 33.2k
R
LIN2
= 59k
METHOD 2: CALCULATION
Step 1:
Determine R
Z
, R
1
, and R
2
.
R
is the RTD resistance at the minimum measured temperature, T
MIN
= –100
°
C.
Using Equation (1) at right gives R
Z
= 602.5
(1% value is 604
).
R
2
is the RTD resistance at the maximum measured temperature, T
MAX
= 200
°
C.
Using Equation (2) at right gives R
2
= 1758.4
.
R
1
is the RTD resistance at the midpoint measured temperature,
T
= (T
+ T
)/2 = (–100 + 200)/2 = 50
°
C. R
1
is NOT the average of R
Z
and R
2
.
Using Equation (2) at right gives R
1
= 1194
.
Step 2:
Calculate R
G
, R
LIN1
, and R
LIN2
using equations above.
R
G
= 757
(1% value is 750
)
R
LIN1
= 33.322k
(1% value is 33.2k
)
R
LIN2
= 58.548k
(1% value is 59k
)
Calculation of Pt1000 Resistance Values
(according to DIN IEC 751)
Equation (1) Temperature range from –200
°
C to 0
°
C:
R
= 1000 [1 + 3.90802 10
–3
T – 0.5802 10
–6
T
2
– 4.27350 10
–12
(T – 100) T
3
]
Equation (2) Temperature range from 0
°
C to +850
°
C:
R
(T)
= 1000 (1 + 3.90802 10
–3
T – 0.5802 10
–6
T
2
)
where: R
is the resistance in
at temperature T.
T is the temperature in
°
C.
TABLE I. Summary of Resistor Equations for Two-Wire and Three-Wire Pt1000 RTD Connections.
Table I summarizes the resistor equations for two-wire and
three-wire RTD connections. An example calculation is also
provided. To maintain good accuracy, at least 1% (or better)
resistors should be used for R
G
. Table II provides standard
1% R
G
values for a three-wire Pt1000 RTD connection with
linearization for the XTR112. Table III gives R
G
values for
the XTR114.
LINEARIZATION
RTD temperature sensors are inherently (but predictably)
nonlinear. With the addition of one or two external resistors,
R
LIN1
and R
LIN2
, it is possible to compensate for most of this
nonlinearity resulting in 40:1 improvement in linearity over
the uncompensated output.
General Equations
NOTE: Most RTD manufacturers provide reference tables for
resistance values at various temperatures.
Resistor values for other RTD types (such as Pt2000) can be
calculated using the XTR resistor selection program in the
Applications Section on Burr-Brown’s web site (www.burr-
brown.com)
I
REF
2.5 [R
1
(R
2
+ R
Z
) – 2 (R
2
R
Z
)]
(R
2
– R
1
)
=
0.4 R
LIN
(R
2
– R
1
)
I
REF
(2R
1
– R
2
– R
Z
)
=
I
REF
2.5 (R
2
– R
Z
) (R
1
– R
Z
)]
(R
2
– R
1
)
=
0.4 R
LIN
(R
2
– R
1
)
I
REF
(2R
1
– R
2
– R
Z
)
=
0.4 (R
LIN
+ R
G
)(R
2
– R
1
)
I
REF
(2R
1
– R
2
– R
Z
)
=
XTR112 (I
REF
= 0.25)
(see Table II)
R
G
R
LIN1
R
G
R
LIN1
R
LIN2
THREE-WIRE
TWO-WIRE
0.625 [R
1
(R
2
+ R
Z
) – 2 (R
2
R
Z
)]
(R
2
– R
1
)
=
1.6 R
LIN
(R
2
– R
1
)
(2R
1
– R
2
– R
Z
)
=
0.625 (R
2
– R
Z
) (R
1
– R
Z
)]
(R
2
– R
1
)
=
1.6 R
LIN
(R
2
– R
1
)
(2R
1
– R
2
– R
Z
)
=
1.6 (R
LIN
+ R
G
)(R
2
– R
1
)
(2R
1
– R
2
– R
Z
)
=
0.25 [R
1
(R
2
+ R
Z
) – 2 (R
2
R
Z
)]
(R
2
– R
1
)
=
4 R
LIN
(R
2
– R
1
)
(2R
1
– R
2
– R
Z
)
=
0.25 (R
2
– R
Z
) (R
1
– R
Z
)]
(R
2
– R
1
)
=
4 R
LIN
(R
2
– R
1
)
(2R
1
– R
2
– R
Z
)
=
4 (R
LIN
+ R
G
)(R
2
– R
1
)
(2R
1
– R
2
– R
Z
)
=
XTR114 (I
= 0.1)
(see Table III)
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XTR114U 功能描述:電流靈敏放大器 4-20mA Crnt Trnsmtr w/Sensor Exc & Lin RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
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XTR114UA 功能描述:電流靈敏放大器 4-20mA Crnt Trnsmtr w/Sensor Exc & Lin RoHS:否 制造商:Texas Instruments 通道數(shù)量: 共模抑制比（最小值）:110 dB 輸入補償電壓:80 uV 電源電壓-最大:5.5 V 電源電壓-最小:2.7 V 電源電流:350 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-16 封裝:Reel
XTR114UA/2K5 功能描述:IC 4-20MA I-TRANSMITTER 14-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件
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