System Description - Input Functions
Fusion4 MSC-L
Part No.: 4418309_Rev09
3- 44
Installation & Operation Manual
Honeywell
3.8.3.2 Characteristics
3.8.4 Dual-Pulse Input (Quad PI)
3.8.4.1 Functional Description
The Dual-Pulse Input (Quad PI) can accept signals from one dual pulse
flow meter for applications requiring a high level of pulse integrity
offered by a dual-pulse flow meter. This is also referred to as a quad
(quadrature) flow meter or one single-pulse flow meter. See section
NOTE: The dual-pulse input cannot be used for accepting
signals from two separate single-pulse flow meters.
FIGURE 3-27 illustrates the simplified block diagram of the Dual-Pulse
Input connections.
Item
Minimum
Typical
Maximum
Unit
Isolation voltage
-
-
3500
V
AC
Switching current (I
SW
)
-
-
10
mA
Input switching frequency
-
-
10
kHz
Input on time (T
ON
)
50
-
-
µs
Input off time (T
OFF
)
50
-
-
µs
External Device presence detec
-
tion Voltage Level
0-5, 18-30
V
External Device absence detec
-
tion Voltage Level
Floating Input (Open Contact), 9-14
V