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BL1908-10RKI Datasheet(PDF) 5 Page - Welwyn Components Limited |
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BL1908-10RKI Datasheet(HTML) 5 Page - Welwyn Components Limited |
5 / 7 page Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series © Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: info@welwyn-tt.com · Website: www.welwyn-tt.com 123 Issue E · 10.05 Welwyn Components Maximum* Maximum* Maximum* total resistance number dissipation with single of taps in 20°C tap ambient (ohms) (watts) with Type single tap 1905 14.5 9k 1 1600 15.0 12k 1 1602 15.5 9k 1 1906 19.0 13k 1 1603 22 18k 1 1604 31 29k 2 1605 41 34k 2 1908 47 38k 2 1607 66 53k 2 1606 80 78k 4 1608 101 93k 4 1609 145 140k 4 Tapped Resistors See Figure 10 Fixed resistors can be supplied with taps to special order. Because of the reduced winding length, the total resistance of a tapped resistor will be less than can be offered on a fixed resistor of the same size. The reduction is proportional to the number of taps and Table 5 is intended as a guide. The minimum resistance per section on all sizes is 1 Ω and the standard selection tolerance for any section is ±10% Ordering Procedure Enquiries for tapped resistors must state the following details: Resistance per section Maximum dissipation per section Maximum operating ambient temperature Maximum permissible dimensions if important Type of terminations required. (See ‘Terminations’, page 3) Resistor style or proposed method of mounting. Table 5 *Maximum total dissipation assumes that this will be evenly spread over the total element length. Low Inductance Resistors Ayrton-Perry wound elements are supplied for low inductance applications. This winding style has a maximum permissible hot spot temperature of 300°C. The maximum dissipation is defined in Table 1 under the heading Operating hot spot temperature of 300°C, and resistance ranges are defined in the three right-hand columns of this table. Application Notes When cold, vitreous enamel has excellent insulation resistance. In common with all insulants the specific resistance of the enamel decreases with increased temperature; therefore, if operated at any temperature approaching the maximum, the resistor cannot be classed as an insulated type and should not be used in contact with any conducting materials. The recommended dissipations for each of the resistor hot spot temperatures applies to resistors mounted horizontally. If the bore is completely blocked a 15% derating is recommended. However, wherever possible, resistors should be mounted vertically with unobstructed bore. This makes best use of the chimney effect of the heated tube and will encourage a cooling stream of air through the bore. Allowances must be made, when tubular resistors are mounted in banks, for the effects produced by radiation between tubes. Appreciable reduction of hot spot temperature can be achieved by arranging that resistors are subjected to some measure of forced draught. In general, it is most efficient to extract air from the resistor enclosure and arrange that an air inlet is adjacent to the bottom of the tubes. If soft soldered connections are used the resistors should be derated where applicable to limit the hot spot temperature to 300°C. |
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