Emerson Micro Motion LF Series, Installation Manual

Page: 41 / 104

LF-Series Flowmeters: Sensor/Transmitter Installation 35
I/O Wiring – FM CIO Transmitters
I/
O
Wi
ri
ng
– FM
A
N
I/
O
W
ir
in
g
– FM FB an
d P
A
I/O
W
ir
in
g
–
F
M
C
IO
Sens
or
W
ir
in
g
Figure 7-5 Frequency output – Terminals 3 & 4 (Channel B) – Internal power
Figure 7-6 Frequency output – Terminals 3 & 4 (Channel B) – External power
Note: See Figure 7-13 for output voltage versus load resistance.
Counter
+
–
Output voltage level is +15 VDC ± 3%
00042
Note: See Figure 7-15 for recommended resistor versus supply voltage.
CAUTION
Excessive current will damage the transmitter.
Do not exceed 30 VDC input. Terminal current must be less than 500 mA.
Pull-up resistor
+
–
Counter
3–30 VDC
+
–
+
–
00042