LI-COR LI7200RS, Instruction Manual

Page: 39 / 226

Using the 7550-101 Auxiliary Sensor Interface
PLUGS
PLUGS
P1 P2
L
K1
L
I-7
5
5
0
L
I-7
5
5
0
L
I-
7
7
0
0
L
I-
7
7
0
0
3
6
0
-0
9
3
3
3
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2
Ma
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i
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U
SA
w
w
w
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ico
r.
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m
AU
X1
AU
X2
G
N
D
AU
X3
AU
X4
G
N
D
AU
X
1
+
AU
X
1
-
G
N
D
AU
X
2
+
AU
X
2
-
G
N
D
D
AC
1
D
AC
2
G
N
D
D
AC
3
D
AC
4
G
N
D
AN
AL
O
G
I
N
A
I
N
A
O
U
T
T
1
T
2
T
3
T
_
R
EF
R
ESE
R
V
ED
R
ESE
R
V
ED
+5
V
G
N
D
AU
X
3
+
AU
X
3
-
AU
X
4
+
G
N
D
AU
X
4
-
G
N
D
+5
V
G
N
D
D
AC
5
D
AC
6
R
EAD
Y
G
N
D
N
C
G
N
D
N
C
G
N
D
Figure 2-8. Interior label of the ASI.
The optional Auxiliary Sensor Interface
(ASI) is an O-ring sealed, weatherproof
junction box that can be used to connect
analog inputs and/or outputs. It has con-
nections for up to six analog outputs, four
general purpose analog inputs, and a con-
stant 5 VDC source (5 mA maximum).
The ASI can also be configured to work
with the LI-7700 Open Path CH
4
Ana-
lyzer. There is a small jumper located at position LK1 (far right in Figure 2-8 above).
When using the ASI with the LI-7700, make sure that the jumper is positioned
over the 2 pins nearest the LI-7550 label (the topmost 2 pins).
Mounting the ASI
Figure 2-9. Orient the gland plugs
toward the ground to prevent water
ingress.
The ASI mounting bracket can be
attached to a 1 to 1½” (2.5 to 4 cm) post.
Two U-bolts and hex nuts are included
for this purpose. It can be mounted either
vertically or horizontally, but to prevent
leaks, orient the plugs so they face the
ground. If you do not want to use the
mounting plate, remove the two screws
that hold the mounting bracket and
secure it however you want.
Section 2. Initial Setup
2-19 Using the 7550-101 Auxiliary Sensor Interface