CiDRA SONARtrac GVF-100 - Manual (Page 79)

Copyright © 2006 CiDRA Corporation Page 10-3
20675-01 Rev 02
transducer, user must configure the sensor inputs in the ‘Input
Config
’ menu.
•
Altitude
Used to calculate the atmospheric pressure corrected for elevation.
Enter the elevation above or below sea level.
The following equation is used within the transmitter to correct for
elevation.
P
atm
= 14.696 * [1 – ((Alt * 10
-3
)/145.45)]
5.2561
where: P
atm
= absolute atmospheric pressure corrected for altitude (psi)
Alt = altitude (feet)
•
Note: If an “absolute” scaled pressure transducer is used it is
not necessary to enter altitude.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.
•
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.
•
Op Mode
Used to select the operational mode of the meter. For combined VF &
GVF operation the Op Mode is set to ‘FLOW/GVF/SOS’. If single
parameter mode is desired, either ‘VF’ or ‘GVF/SOS’ can be selected.
•
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.
•
4-20mA (CH 1 & CH 2)
Several selections are available for outputting under the ‘4-20mA’
setup menu screens.
The ‘Output Sel’ sub-menu selection permits selection of the
parameter to output on the 4-20mA channels. The GVF meter permits