CiDRA SONARtrac HD VF-100 - Manual (Page 77)

Copyright © 2006 CiDRA Corporation Page 10-2
20638-02 Rev 01
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Calibration
Calibration factors are specific to a given pipe size and wall thickness.
The value for ‘C0’ term, ’C1’ term, and ‘C2’ term are found on the
sensor band, and on the label that attaches to the sensor cover
access panel and on the transmitter inner door.
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Flow Direction
Input (‘Forward’ or ‘Reverse’) is used if the sensor is installed with
flow indicating arrows opposite the actual flow within the process pipe.
It is also used if the flow within the pipe is reversed.
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Set Date/Time
The date and time is entered in the transmitter in order to set the time
stamp that will be applied to data downloaded on the USB Port
(discussed later in this manual). Whenever possible, the time and
date should to be synchronized to the process control system. Note:
The time is not automatically updated to reflect daylight savings time.
10.1.2 Output Config Menu
These inputs are used to configure the various outputs from the
transmitter.
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4-20mA (CH 1 & CH 2)
Several selections are available for outputting under the ‘4-20mA’
setup menu screens.
The ‘Output Sel’ sub-menu outputs measurement of ‘Flow Rate’, or
‘Blank’.
The ‘Power Sel’ selection is used to specify whether ‘Internal’ power
or ‘External’ power is used to drive the 4-20mA current output.
The ‘Low End’ and ‘High End’ menu selections allow the user to
change the limits of flow that are output on the 4-20mA channel, by
specifying what the corresponding flow values are for the 4mA and
20mA current settings. The specific flow rates that correspond to the
two limits in current output are set by the user, who specifies a
percentage of the total flow range of the meter.
The following figure gives an example screen shot of a user specified
‘High End‘ setting. The user settable percentage is located on the left
side of the bottom line of the display, with the corresponding flow
value shown on the right. The percentage represents a point within
the output range of the meter. This is represented by 0%=0 ft/s and
100%=30 ft/s. As the percentage is changed between 0-100%, the
corresponding flow value is indicated in the currently selected flow
units.