Please help us help you to select the correct transducer for your application by providing some basic information. Complete as much of the application data requested as possible, then print this page and fax it to us. Use the separate Model F or TR Tension Roll Transducer worksheets for sizing F type or Tension Roll® transducers.
The load rating of your desired tension transducers needs to be determined prior to size selection. Load rating is calculated using physical properties like the weight of the idler roll, the wrap angle on the roll, your expected web tension, and the direction of force due to web tension. The drawings below illustrate an axial (side) view of a tension-sensing roll in a machine frame for the three general web wrap orientations (Up, Down, Sideways). Record the information requested in the terms B through E below. Then use the formula below the drawing closest to your orientation to calculate your load rating, or call DFE and we calculate it for you.
B. TYPE OF WRAP
Cross out the wrap examples that do not apply.
Note: The resultant force FT points in the same direction as the arrow on the transducer.
C. ANGLES AND IDLER WEIGHT
Record your information below.
• B = Wrap Angle: _____ Degrees (Note: The wrap angle (B) may be calculated by subtracting your measured angle (C) from 180°.
B = 180 - C)
• W = Weight of Idler Roll: _____ Pounds
• FT = force on idler roll due to web tension. FT is in the same direction as the arrow on the transducer: _____ Degrees
• A = Angle between FT and vertical axis: _____ Degrees
D. WEB CHARACTERISTICS
• Total estimated operating tension: Max. _____ Pounds, Min. _____ Pounds
• Type of Web Material: _______________________________
Web Width: Max. _____ Inches, Min. _____ Inches
• Basis Weight or Thickness: _____ Pounds
• Web Speed: Max. _____ Feet Per Minute,
Min _____ Feet Per Minute
E. TRANSDUCER CHARACTERISTICS (1)
• Type: Model C _____ RS _____ RFA _____ LT _____ NW _____ (Specify roll width)