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Reference Manual
00809-0100-4860, Rev BC
Section 4: Operation
January 2013
Operation
Pulse output
The Rosemount 8600D 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 four methods for
configuring the pulse output:
Off
Direct (Shedding Frequency)
Scaled Volume
Scaled Velocity
Scaled Mass
Direct (shedding frequency)
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 volume
This mode allows you to configure 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.)
Pulse scaling rate
Pulse scaling rate allows the user to set a certain volume flow rate to a desired Frequency.
For example:
1. Enter a flow rate of 100 gallons per minute.
2. Enter a frequency of 10,000 Hz.
Pulse scaling unit
Pulse scaling unit allows the user to set one pulse equal to a desired volume.
For example:
1 pulse = 100 gal. Enter 100 for the Flow Rate.
Field Comm. 1, 4, 2, 2, 1
Field Comm. 1, 4, 2, 2, 1, 2
Field Comm. 1, 4, 2, 2, 1, 3
Field Comm. 1, 4, 2, 2, 1, 3, 1
Field Comm. 1, 4, 2, 2, 1, 3, 2