Rosemount Model 8800C Vortex Flowmeter
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Pulse Output Scale
The Model 8800C 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 three methods
for configuring the pulse output:
• Pulse Scaling — Rate
• Pulse Scaling — Unit
• Direct (Shedding Frequency)
Pulse Scaling – Rate
This mode allows you to configure the pulse output based on a flow
rate. For example, set 100 gallons per minute = 10,000 Hz. (The user
enterable parameters are flow rate and frequency.)
1. Enter a flow rate of 100 gallons per minute.
2. Enter a frequency of 10,000 Hz.
Pulse Scaling – Unit
This mode changes the frequency output to represent the flow rate. If
you are using an external totalizer or the frequency output, it may be
important to be able to scale the frequency output to familiar terms.
The scaled output equates one transistor switch closure pulse to a
selectable number of volume units. For example, 1 pulse = 1 gallon.
The pulse output is an isolated switch-closure frequency output signal
proportional to flow. The frequency limits are as follows:
• Maximum Frequency = 10,000 Hz
• Minimum Frequency = 0.0000035 Hz (1 pulse/79 hours)
• Duty Cycle = 50%
• For Frequencies
0.1 Hz the pulse width will equal 5 seconds
Example: Pulse Output Frequency = 0.0333 Hz (1 pulse/30 seconds)
HART Comm. 1, 4, 3, 2, 1
HART Comm. 1, 4, 3, 2, 1, 1
HART Comm. 1, 4, 3, 2, 1, 2
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