Cameron NUFLO MC-III EXP, Руководство пользователя

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MC-III™ EXP Flow Analyzer Section 4
Pulse Output
The Pulse Output screen (Figure 4.32) allows users to configure the MC-III EXP to provide a pulse output
representing increments in volume. A test mode function is also included, allowing a user to calibrate and/or
verify the output received by an end device.
Figure 4.32—Pulse Output screen
Configuring Pulse Output
By default, the pulse output option is disabled to reduce current consumption. To conserve power, do not
enable this feature unless it will be used.
To enable the pulse output option, perform the following steps:
1.
Check the “Enable” checkbox.
2. Enter the pulse duration value using the “plus” and “minus” buttons on the screen, or the page-up and
page-down keys on a computer keyboard. The pulse length (pulse width) determines the length of each
output pulse in milliseconds (ms).
3. Click on the pencil icon next to the scale field to open a data-entry window (
Figure 4.33, page 70
), and
enter the scale factor. Adjust the decimal position, if necessary, using the slide bar. The scale factor sets
the volume increment that will cause a pulse output to occur. The unit for this factor is determined by the
unit set for the volume display.
Note—The scale factor can be any number; it is not limited to powers of 10 (1, 10, 100, etc.).
In applications where high flow rates may occur for extended periods, pulses can be lost due to the
instrument’s inability to register the flow rate at the maximum output frequency. To avoid the loss of pulses,
users can raise the scale factor or shorten the pulse duration. The software calculates the maximum flow
rate that can be reached before pulse caching is likely to occur, and displays the information on the Pulse