Pulse Output - Emerson Rosemount 8800D Series Reference Manual

Operation
May 2016
Restore Factory Calibration
FastKeys
Restores factory analog trim settings.
4.2.1

Pulse Output

FastKeys
Can be configured using the configuration tool guided setups.
Note
Configuration of the pulse features is allowed even if the pulse option (Option P) was not
ordered.
The Rosemount 8800D comes with an optional pulse output option (P). This enables the
flowmeter to output the pulse rate to an external control system, totalizer, or other device.
If the flowmeter was ordered with the pulse mode option, it may be configured for either
pulse scaling (based on rate or unit) or shedding frequency output.
There are several methods for configuring the pulse output:
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Note
In order to totalize in compensated mass flow, for units with the MTA option only, set pulse
output to Scaled Mass even if the pulse output was not ordered or will not be used.
Direct (shedding)
This mode provides the vortex shedding frequency as output. In this mode, the software
does not compensate the K-factor for effects such as thermal expansion or differing mating
pipe inside diameters. Scaled pulse mode must be used to compensate the K-factor for
thermal expansion and mating pipe effects.
Scaled volumetric
This mode allows for configuration of the pulse output based on a volumetric flow rate. For
example, set 100 gallons per minute = 10,000 Hz. (The user enterable parameters are flow
rate and frequency.)
Scaled corrected volumetric
This mode allows for configuration of the pulse output based on a corrected volumetric
flow rate.
54
3, 4, 3, 9
2, 2, 4, 4, 2
Off
Direct (Shedding Frequency)
Scaled Volume
Scaled Velocity
Scaled Mass
Scaled Corrected Volumetric
Reference Manual
00809-0100-4004, Rev DC
Operation