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| 型號(hào)： | DEM-XTR501C |
| 英文描述： | DEM-XTR501C - DISCONTINUED PRODUCT. No longer recommended for new design. |
| 中文描述： | DEM的XTR501C -已停產(chǎn)產(chǎn)品。不再推薦用于新設(shè)計(jì)。 |
| 文件頁(yè)數(shù)： | 2/4頁(yè) |
| 文件大?。?/td> | 70K |
| 代理商： | DEM-XTR501C |
2
DEM-XTR501C
POWER SUPPLY
The evaluation fixture operates from a single dc supply in
the range of 12V to 30V. The supply being used should be
capable of delivering 1 amp.
BOARD LAYOUT AND CONNECTIONS
Refer to Figure 1, PCB Layout and Figure 2, Circuit Diagram
for the connections to the evaluation fixture. The 4-part
connector, Con 1, is for the power supply and current/voltage
out. The connector designations are marked in Figure 1, PCB
Layout. The 5-part connector, Con 2, is for pellistor connec-
tions. The numbers refer to the XTR501 pins as indicated in
Figure 2. The circuit diagram also shows the manner in which
the pellistor can be connected. This is for a 5-wire connection.
For a normal 3-wire connection, connect terminal 15 to
terminal 16, and connect terminal 17 to terminal 11.
THEORY OF OPERATION
The XTR501 demo board should be used in conjunction
with the XTR501 product data sheet and is designed to
provide an example of a typical application in which the
XTR501 could be used. The demo board also fits into one of
the standard industrial enclosures.
The evaluation fixture is set up for an LEL of Methane, and
the assumption that a VQ21 gas sensor, or equivalent, is
being used. Reference to the accompanying circuit diagram
of this document details the circuit values for this application.
The bridge voltage, recommended by the manufacturer for
the gas sensor, is set by R
3
and VR
3
. When the gas sensor is
connected as shown in the circuit diagram, it forms one side
XTR501
16
15
18
3
17
11
22
24
23
1
2
10
14
R
2
470
L1
470μH
R
4
4.7k
VR
1
1k
R
5
4.7k
R
SPAN
VR
2
100
VR
3
5k
R
SET
R
3
20k
R
1
249
C
0.1μF
C
1
10μF
R
6
1.6k
12
Con 1
Con 2
V
IN
Com
V
O
I
O
SW1
Pellistor
FIGURE 2. Circuit Diagram.
of a Wheatstone bridge arrangement. The bridge is balanced
by VR
1
, giving an output of 4mA at I
O
on Con 2. The output
of the XTR501 can be converted to a voltage in the range of
1V to 5V corresponding to 4 to 20mA, by SW1. This can be
read on the terminal designated V
O
on Con 2. The voltage
output is filtered at a nominal 1kHz.
When the sensor is exposed to 2.5% Methane, i. e., midscale,
the output should read 12mA, or 2.5V depending on the
switch position. R
2
and VR
2
set the span of the unit and can
be adjusted to bring the output to the exact value for midscale.
DEM-XTR501C
FIGURE 1. PCB Layout.
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