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參數(shù)資料
| 型號(hào)： | XTR501 |
| 英文描述： | XTR501 - HIGH CURRENT BRIDGE DRIVER and 4-20mA Transmitter |
| 中文描述： | XTR501 -大電流橋式驅(qū)動(dòng)器和4 - 20mA變送器 |
| 文件頁(yè)數(shù)： | 7/7頁(yè) |
| 文件大?。?/td> | 68K |
| 代理商： | XTR501 |
XTR501
7
100
50
0
10
20
30
40
50
60
70
80
90
B
% Methane In Concentration
To Calculate R
SPAN
For V
IN
= 10mV and I
O
= 20mA
i.e
For additional bridge
smoothing, 100
μ
H
inductors may be
inserted as shown.
Note that inductors
must be able to handle
high bridge current.
FIGURE 4. Internal Circuit +V
B
SET
.
50k
10k
(a)
R
SET
+V
BSENSE
+V
BSET
X
T
R
5
0
1
10
11
An interesting feature of pellistor elements, and those tested
in the applications, is that they create a similar bridge output
at LEL for almost all hydrocarbons. This feature allows a
comparative measurement to be made of one gas when an
instrument has been calibrated for another.
e.g. Instrument calibrated for Methane (K=112) measuring
Hydrogen (K=85.8).
Actual % of LEL will be 1.31 x meter reading. (112/85.8).
This is an approximation and it is recommended that for
exact conversions the instrument should be calibrated using
the relevant gases.
Tables of these constants can be sourced through the manu-
facturers of gas sensing products.
An example of the XTR501 used with a pellistor catalytic
gas detector is shown in Figure 1.
To Calculate R
SET
See Figure 4. Point (a) will be maintained at 1.235V.
FIGURE 2. Bridge Smoothing.
FIGURE 3. Typical Pellistor Response.
Example:
V
B
1.5
2.0
3.0
4.0
5.0
R
SET
Calculated
Open
21.858k
7.891k
4.815k
3.464k
V
B
–1.235
10k
=
1.235 50k
+
R
SET
R
SET
50k
)
50k
V
B
–1.235
(
10k
(
)
1.235
)
(
)
=
50k
+
R
SET
R
SET
=
1
+
50k
R
SET
5 V
B
–1.235
1.235
)
–1
=
50k
R
SET
R
SET
=
50k
(
)
1.235
(
)
–1.235
)
5 V
B
1.235
0.016
)
0.01
(
0.016
(
)
=
1
+
50k
/ R
SPAN
(
)
4.94
0.02
=
0.004
+
0.016
1
+
50k
/ R
SPAN
4.94
0.01
I
O
=
0.004
+
0.016
1
+
50k
/ R
SPAN
4.94
V
IN
494
=
1
+
50k
/ R
SPAN
R
SPAN
=
50k
493
=
101.4
4.94
V
IN
=
1
+
50k
R
SPAN
R
SPAN
=
50k
4.94
V
IN
–1
100μH
100μH
Detector
Compensator
R
T
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