Filter
Top Products
90
Reference Manual
00809-0100-4444, Rev AC
Section 5: Advanced Configuration Functionality
January 2015
Advanced Configuration Functionality
5.2.2 Pulse output
Under this function the pulse output of the 8732EM can be configured.
Pulse scaling
Transmitter may be commanded to supply a specified frequency between 1 pulse/ day at 39.37
ft/sec (12 m/s) to 10,000Hz at 1 ft/sec (0.3 m/s).
Note
Line size, special units, and density must be selected prior to configuration of the pulse scaling
factor.
The pulse output scaling equates one transistor switch closure pulse to a selectable number of
volume units. The volume unit used for scaling pulse output is taken from the numerator of the
configured flow units. For example, if gal/min had been chosen when selecting the flow unit, the
volume unit displayed would be gallons.
Note
The pulse output scaling is designed to operate between 0 and 10,000Hz. The minimum
conversion factor value is found by dividing the minimum span (in units of volume per second)
by 10,000Hz.
Note
The maximum pulse scaling frequency for transmitters with an intrinsically safe output (output
option code B) is 5000Hz.
When selecting pulse output scaling, the maximum pulse rate is 10,000Hz. With the 110
percent over range capability, the absolute limit is 11,000Hz. For example, if you want the
Rosemount 8732EM to pulse every time 0.01 gallons pass through the sensor, and the flow rate
is 10,000 gal/min, you will exceed the 10,000Hz full-scale limit:
The best choice for this parameter depends upon the required resolution, the number of digits
in the totalizer, the extent of range required, and the maximum frequency limit of the external
counter.
LOI menu path Detailed Setup, Output Config, Pulse
Traditional fast keys 1,4,2,2
Device dashboard 2,2,2,2
LOI menu path Detailed Setup, Output Config, Pulse, Pulse Scaling
Traditional fast keys 1,4,2,2,1
Device dashboard
2,2,2,2,3