 India Contact Information

BHUBAN CENTRE, P-512/3,PARNASHREE PALLY, KOLKATA – 700060, INDIA.

Tel: 0091 98304 19756
E-Mail: amitbanerjee@alloywire.com Designing a Tape Element

The method is similar to that used in designing a round wire element.

Where:

 b Tape width (mm) t Tape thickness (mm)

Example:

1.  To calculate the tape size and length required for a 600w/220v mica-wound element in a band heater, operating at a maximum temperature of 800°C, the total resistance of the element at operating temperature (Rt) will be: 2.  Using RW80 tape, the Temperature Resistance Factor (F) at 800°C is 1.051.  Thus, the total resistance of the element at 20°C (R) will be: 3.  Knowing the dimensions of the mica-board, the length of the tape that may be wound round it may be estimated.  Thus, the resistance required per metre of tape will be:

For example a length of tape of 7 metres – 4.  A tape size of 1.1mm x 0.09mm has a resistance per metre of 11.10 ohms/m (see stock sizes) which is near to 10.97 ohms/m.

5.  To verify the actual tape length (L) A change in tape length may mean adding or subtracting turns (altering the pitch of the tape) to achieve the total resistance value required. 