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
3.8.3 - Single Pulse Input.
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
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