Precision Digital PD6080 - Manual (Page 83)

PD6080/PD6081 Super Snooper Modbus Scanner Instruction Manual
83
Changing the Volume from Gallons to Liters
In the above graphic, entering the 48" for the diameter and 120" for the length of the round horizontal
tank, the scanner automatically calculates that the volume of the tank is 940.02 gallons.
1. Convert gallons to liters
1 US gallon = 3.7854 L
940.02 gal = 3558.4 L
2. Go to the Setup - PV - Decimal Point menu and change the decimal point to 1 decimal.
3. Go to the Setup - PV - Scale menu and press Enter until dis 2 is shown on the top display.
4. Press Enter and change the display 2 value to 3558.4.
5. The scanner is now displaying the volume in liters.
Note: The display can be scaled to display the volume in any engineering units.
Math Functions (math)
The Math menu is used to select the math function that will determine the channels’ C1-C4 value. These
math functions are applied to PVs and other math channels. The results are displayed by selecting
Display Channel C (d Ch C) in the Display menu. Most math functions may be applied to all PVs: For
example it is possible to add up to 16 PVs and calculate the total volume of all the tanks in a field. The
Math2 function allows for further calculations on the results of other math channels (e.g. C4 = C2/C1).
The following math functions are available:
Name Math Operation (Examples)
(P = Adder, F = Factor)
Setting
Addition (PV1+PV2+P)*F Sunm
Difference (PV1-PV2+P)*F diF
Absolute difference ((Abs(PV1- PV2)+P)*F diFAbS
Average (((PV1+PV2)/2)+P)*F AvG
Multiplication ((PV1*PV2)+P)*F Nmulti
Division ((PV1/PV2)+P)*F divide
Max PV Max value of all selected PVs Hi-pv
Min PV Min value of all selected PVs Lo-pv
Draw ((PV1/PV2)-1)*F drAuw
Weighted average ((PV2-PV1)*F)+PV1 uwavg
Ratio (PV1/PV2)*F Ratio
Concentration (PV1/(PV1+PV2))*F Concen
Math 2 Math on other math channels Nmath2
Addition C3 = (C1+C2+P)*F Sunm
Difference C4 = (C1-C2+P)*F diF
Absolute difference C3 = ((Abs(C1- C2)+P)*F diFAbS
Average C4 = (((C1+C2)/2)+P)*F AvG
Multiplication C3 = ((C1*C2)+P)*F Nmulti
Division C4 = ((C1/C2)+P)*F divide
Math Constants (Const)
The Math Constants menu is used to set the constants used in the math channel. The math functions
include the selected PVs, as well as the constants P (Adder) and the Factor F (Multiplier) as indicated in
the above examples.
The Adder constant (P) may be set from -99.999 to 999.999.
The Factor constant (F) may be set from 0.001 to 999.999.
The above chart details the math functions that may be selected in the Math Function menu.