Raven Viper Pro Installation & Operation Manual page 255

Pressure Transducer
Calibrating the Pressure Transducer
Read the pressure on an analog gauge connected in line with the pressure transducer.
1.
Note:
If no pressure gauge is installed in line with the pressure transducer, bleed or relieve any pressure
applied to the transducer and enter a value of '0' for the pressure value in the procedure below.
Touch the Pressure area on the CAN Controller Status screen.
2.
Note:
Each product node or control channel has two pressure settings. Use the Next or Prev buttons to
display the correct pressure transducer to calibrate before proceeding.
Touch the Pressure value and use the on-screen keyboard to enter the pressure gauge reading
3.
Touch Set to calibrate the pressure transducer.
4.
Touch OK to return to the CAN Controller Status screen.
5.
Spreader Constant
Note:
The spreader constant should be verified by performing the procedure in Verification of Spreader
Constant section on page 249.
For Gran 2 or Gran 3 applications, gate width is the total of both openings.
Standard Unit Rate Display
For Rates displayed in 1 pound increments, the formula to calculate the spreader constant is:
Where SC = the Spreader Constant, L = Length of belt travel in inches per 1 revolution of the encoder, GH =
Gate Height in inches, GW = Gate Width in inches.
For Example:
Given a Length of belt travel of 13 inches, a Gate Height of 7 inches and a Gate Width of 15 inches:
Enter 228 as the Spreader Constant if the field computer is set to display English units.
Manual No. 016-0171-122 Rev. I
,
311 040
SC = --------------------------------- -
× ×
L GH GW
,
311 040
-------------------------- - = 228
× ×
13 7 15
245