90
Reference Manual
00809-0300-4750, Rev CA
Advanced Configuration Functionality
March 2016
Advanced Configuration Functionality
The width, or duration, of the pulse can be adjusted to match the requirements of different
counters or controllers (see
). These are typically lower frequency applications
(< 1000 Hz). The transmitter will accept values from 0.1 ms to 650 ms.
For frequencies higher than 1000 Hz, it is recommended to set the pulse mode to 50% duty
cycle by setting the
pulse mode
to
frequency output
.
The
pulse width
will limit the maximum frequency output, If the
pulse width
is set too wide
(more than
1
/
2
the period of the pulse) the transmitter will limit the pulse output. See
example below.
Figure 5-1. Pulse Output
Example
If pulse width is set to 100 ms, the maximum output is 5 Hz; for a pulse width of 0.5 ms, the
maximum output would be 1000 Hz (at the maximum frequency output there is a 50% duty
cycle).
To achieve the greatest maximum frequency output, set the pulse width to the lowest value
that is consistent with the requirements of the pulse output power source, pulse driven
external totalizer, or other peripheral equipment.
Example
The maximum flow rate is 10,000 gpm. Set the pulse output scaling such that the
transmitter outputs 10,000Hz at 10,000 gpm.
Pulse Scaling =
Pulse width
Minimum period (50% duty cycle)
Maximum frequency
100 ms
200 ms
0.5 ms
1.0 ms
Open
Closed
Pulse
Width
Period
1cycle
200 ms
--------------------
5 Hz
=
1cycle
1.0 ms
------------------
1000 Hz
=
Flow Rate gpm
(
)
60
s
min
-----------
frequency
(
)
×
---------------------------------------------------------------
Содержание Rosemount 8750W
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