40
Reference Manual
00809-0300-4750, Rev CA
Advanced Installation Details
March 2016
Advanced Installation Details
3.4
Additional loops
There are three additional loop connections available on the 8750W Transmitter:
Pulse output — used for external or remote totalization.
Channel 1 can be configured as discrete input or discrete output.
Channel 2 can be configured as discrete output only.
3.4.1
Connect pulse output
Field mount transmitter
The pulse output function provides a galvanically isolated frequency signal that is
proportional to the flow through the sensor. The signal is typically used in conjunction with
an external totalizer or control system. The default position of the internal/external pulse
power switch is in the EXTERNAL position. The user-selectable power switch is located on
the electronics board.
External
For transmitters with the internal/external pulse power switch set in the EXTERNAL
position, the following requirements apply:
Supply voltage: 5
to
28 VDC
Maximum current: 100 mA
Maximum power: 1.0 W
Load resistance: 200 to 10k Ohms (typical value 1k Ohms)
Pulse mode: Fixed pulse width or 50% duty cycle
Pulse duration: 0.1 to 650 ms (adjustable)
Maximum pulse frequency: 10,000 Hz
FET switch closure: solid state switch
Output option code
Supply voltage
Resistance vs cable length
A
5—28 VDC
Содержание Rosemount 8750W
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