CiDRA SONARtrac GVF-100 - Manual (Page 89)

Copyright © 2006 CiDRA Corporation Page 10-13
20675-01 Rev 02
10.1.3 Input Config
The Input Config menu is used when optional external sensors (for
example a pressure or temperature transducer) are powered by and
input to the transmitter. The transmitter does not have the capability
to display or transmit these sensor values. Note: When these sensor
inputs are used the ’Temperature Sel’ and ‘Pressure Sel’ menu
options under the ‘Basic Config’ menu must be used to designate
which sensor input is used for a particular measurement.
•
Sensor 1 & 2
‘Units’ allows for setting the sensor units to ‘None’ (not used) ‘F’
(temperature degrees F), ‘C’ (temperature degrees C), ‘Barg’
(pressure in Bars gauge), ‘kPag’ (pressure in kilo Pascals gauge),
‘PSIg’ (pressure in pounds per square inch gauge). Note: If an
“absolute” scaled pressure transducer is used select ‘None’ for units.
‘Scale’ allows for setting the range of the input in units of measure
(‘Units’) per mA.
‘Offset’ allows for inputting an offset in mA due to a non-zero milliamp
sensor output range. The offset is calculated by the equation y=mx+b
where: y is a value within the transducer range, m is the transducer
range divided by the milliamp output range, x is the milliamp output at
the ‘y’ value, and b is the offset.
For example, a 0-100 psig pressure transducer with a 4-20 mA output
will have a –25 offset.
y=mx+b
100 psi = (100psi / 16mA) x (20mA) +b
100 psi – 125 psi = b
-25 psi = b = ‘Offset’
10.1.4 Customize Menu
The Customize menu is used to configure the transmitter to meet user
needs for local display of flow parameters.
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Display
The display parameters are used to customize the displayed units and
appearance of the display.
‘Line 1’ and ‘Line 2’ adjustments set the outputs of those lines to
‘Totalizer’, ’Flow Rate %’, ‘Flow Rate’, ‘GVF’, ’SOS’, and ‘Blank’.
‘Contrast’ is used to adjust the screen appearance due to lighting
conditions. Normally this is set to 170.
•
Sensor Setup
‘State’ is used to turn individual sensors ‘On’ or ‘Off’. Normal
operating condition is with all sensors set to ‘On’.