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| Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series Welwyn Components * * * * Impervious lead free vitreous enamel coating Can be supplied with fixed, adjustable, tapped or low inductance winding Seven termination styles with choice of mounting arrangements Manufactured RoHS compliant Pb-free terminations* * Check status of stock when ordering General Information Vitreous enamelled wirewound resistors are capable of withstanding a higher dissipation size for size, than any other protected type; this is attributable to the higher operating temperature which the wire and enamel can withstand. Vitreous enamel provides exceptionally good protection to the wire element and is essentially impervious to moisture. The resistors can safely be used in harsh environmental conditions. The Welwyn range is based on thirteen sizes of tube, each of which has a recommended maximum dissipation which limits operating surface temperature to a maximum of 375C. The stability and high reliability of Welwyn tubular vitreous resistors is a direct result of the best quality materials being used in their construction. High purity ceramic tubes have been matched with nickel chromium resistance wires and specially formulated enamel to ensure that the resistors can withstand repeated heat cycling without damage. Connections between the resistance element and end terminations are welded; other connections are brazed. Mounting devices are available which permit resistors to be mounted by both ends or by one end. Single ended mounting is recommended for applications which do not subject the resistor to shock or vibration. Ferrules and the F type mounting plug are anchored into the tubes with high temperature adhesive. Special requirements, for types or styles not described in this brochure, will be considered for economic quantities. Electrical Data Power rating at 70C Resistance range Limiting element voltage TCR (-55 to +200C) Resistance tolerance Values Thermal impedance Operating temperature range watts ohms volts ppm/C % C/watt C 1605 47 1601 11 1905 16 1602 1906 1603 1604 17 22 25 35 See Table 1 See Table 1 Typically: <+75 Maximum + 200 1, 2, 5, 10 See table 1 for value restrictions E24 preferred See fig. 1 -55 to +375 1908 54 1607 1606 76 91 See Table 1 See Table 1 1608 115 1609 165 1600 16.5 Power rating at 70C Resistance range Limiting element voltage TCR (-55 to +200C) Resistance tolerance Values Thermal impedance Operating temperature range watts ohms volts ppm/C % Typically: <+75 1, 2, 5, 10 C/watt C-55 to +375 Maximum + 150 See table 1 for value restrictions E24 preferred See fig. 1 Note See Figure 1 for curves of temperature rise / watts dissipation. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data, relates to current manufacture and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue E * 10.05 (c) 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 121 Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series Welwyn Components Electrical Data Table 1 (continued) *Dissipation (watts) to produce operating hotspot temperature (C) of: Ambient = 20C Ambient = 70C Resistance range (ohms) Limiting element voltage Termination style Low inductance winding resistance range (ohms) Min. res. at Max. at either tolerance 1.3k 3.5k 5.0k 4.0k 5.5k 7.5k 11.5k 14k 16k 22k 32k 38k 58k Minimum resistance at Max. at any tolerance 15k 30k 56k 43k 50k 83k 100k 100k 100k 100k 160k 180k 250k Type 200 1601 1905 1600 1602 1906 1603 1604 1605 1908 1607 1606 1608 1609 5 7 7.5 8 9.5 11 15.5 21 24 34 41 52 74 300 10 14.5 15 15.5 19 22 31 41 47 66 80 101 145 375 14 20 21 22 28 32 45 59 68 95 115 145 208 375 11 16 16.5 17 22 25 35 47 54 76 91 115 165 5% 1 1 1 1 1 1 1 1 1 1 1 1 1 2% 15 15 15 20 20 20 20 30 30 30 30 30 35 1% 25 30 30 25 30 30 60 40 40 50 40 50 50 C 250 500 700 850 1300 1100 1200 1300 2100 2100 3000 All others 150 450 600 350 550 750 1000 900 1000 900 1900 1800 2500 10% 10 10 10 10 10 10 15 15 10 15 15 20 30 5% 50 50 50 50 50 50 50 50 50 50 50 50 100 *The stated dissipation applies to resistors mounted horizontally with unobstructed bore. Performance Data Max Load : 1000 hours at 70C Shelf life : 12 months at room temperature Climatic Long term damp heat Bump and vibration Noise (in a decade of frequency) Pulse Handling Data R% R% R% R% R% R% 5.0 1.0 0.5 0.2 0.1 zero Available by request Typ 3.5 0.1 0.35 0.05 0.02 zero (c) 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 122 Issue E * 10.05 Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series Welwyn Components Physical Data Table 2 Dimensions in millimetres. See fig 2-8 for styles A Type 1601 1905 1600 1602 1906 1603 1604 1605 1908 1607 1606 1608 1609 max 33.0 56.1 61.5 51.0 64.3 74.5 102 89.5 102 102 166 152 216 B max 17.5 14.5 14.5 17.5 17.5 17.5 17.5 24.0 24.0 32.0 24.0 32.0 32.0 C max 8.2 6.55 6.55 8.2 8.2 8.2 8.2 13.2 13.2 19.2 13.2 19.2 19.2 D nom 4.5 4.5 4.5 4.5 4.5 4.5 4.5 5.7 5.7 7.0 5.7 7.0 7.0 E max 5.0 5.0 5.0 5.0 5.0 5.0 5.0 6.8 6.8 9.8 6.8 9.8 9.8 F max 19.5 17.5 17.5 19.5 19.5 19.5 19.5 26.5 26.5 32.0 26.5 32.0 32.0 G nom 15 10 10 15 15 15 15 17 17 22 17 22 22 H .25 3.0 3.0 3.0 3.0 3.0 3.0 3.0 4.0 4.0 6.4 4.0 6.4 6.4 M3 M3 M3 M3 M3 M3 M3 M4 M4 M6 M4 M6 M6 J K max 59 77 90 101 128 122 134 134 198 184 248 Terminations Styles B, 4B, AP and AW are available in all 13 tube sizes. Styles C, CB and CP are available in sizes 1601 to 1609 inclusive, 1906 and 1908 Lugs (Figure 2): Pb free solder coated nickel iron. Denoted by prefix B to size reference, thus B1602 Pigtails (Figure 3): 14/.193 mm copper, 150 mm minimum length. Denoted by prefix AP, thus AP1602 Rigid wires (Figure 4): 1.2 mm diameter tinned copper, 32 mm minimum length. Denoted by prefix AW, thus: AW1602 Lugs with screws, nuts and washers (Figure 5): Nickel plated brass screws and nuts. Denoted by prefix 4B, thus: 4B1602. Ferrule, electrically isolated (Figure 6) Connection to resistor via Pb free solder coated nickle iron lugs. Denoted by prefix CB, thus: CB1602. Ferrule, electrically live (Figure 7) Nickel plated brass. Denoted by prefix C, thus: C1602. Ferrule, electrically isolated (Figure 8): Connection to resistor via pigtails of 14/.193 mm copper, 150mm minimum length. Denoted by prefix CP thus: CP1602 Marking The resistors are legend marked with type reference, resistance value, tolerance and manufacturing date code. Value marking conforms to IEC 62. Solvent resistance: The vitreous coating and marking are resistant to all accepted industrial cleaning fluids. (c) 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 Issue E * 10.05 123 Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series Adjustable Resistors (see Figure 9) Adjustable resistors use the same basic construction as fixed resistors already described, and have a window in the vitreous enamel through which contact is made to the resistive element by a sliding contact band. The band is fitted with a clamping screw and nut to retain it firmly in position. The adjustable winding style has a maximum permissible hot spot temperature of 300C and the maximum dissipation, for an ambient temperature of 20C, is specified in Table 4. The Welwyn Components partial open winding necessitates a reduced maximum resistance, when compared with fixed resistors, and the resistance range is also defined in Table 4. More than one adjusting band can be fitted, up to the maximum number specified in Table 3. Adjustable resistors are available in termination styles B, 4B, AP, C, CB and CP, in sizes 1602 to 1609 inclusive and 1906 and 1908 denoted by prefix `V'. Table 3 Tube size 1602 1603 1906 1604 1605 1908 1606 1607 1608 1609 20 25 25 30 30 30 27 32 32 38 38 38 3.2 3.7 3.7 3.7 3.7 3.7 3 2 4 2 3 5 20 27 3.2 1 A mm max. B mm max. Hole C dia. mm Max. no of adjusting bands Table 4 Max. dissipation in 20C ambient (watts) Type 200C hot spot 1602 1906 1603 1604 1605 1908 1607 1606 1608 1609 8 9.5 11 16 21 24 34 41 52 74 300C hot spot 15.5 19 22 31 41 47 66 80 101 145 Min. for styles VC, VCP 4 4 6 8 6 11 11 14 17 25 Resistance range (ohms) Min. for all other styles 3 3 6 8 6 10 9 13 16 24 Max. for all styles 1.6k 2.5k 3.0k 5.3k 4.5k 7.5k 8.1k 13.2k 15.4k 25.5k Manufactured Values E24 preferred Standard Selection Tolerance 10% All other details of the electrical and environmental performance of adjustable resistors are the same as for fixed resistors. (c) 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 124 Issue E * 10.05 Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series 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 and the standard selection tolerance for any section is 10% Welwyn Components 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 in 20C ambient (watts) with single tap 14.5 15.0 15.5 19.0 22 31 41 47 66 80 101 145 Maximum* resistance with single tap (ohms) Maximum* number of taps Type 1905 1600 1602 1906 1603 1604 1605 1908 1607 1606 1608 1609 9k 12k 9k 13k 18k 29k 34k 38k 53k 78k 93k 140k 1 1 1 1 1 2 2 2 2 4 4 4 *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 300C. The maximum dissipation is defined in Table 1 under the heading Operating hot spot temperature of 300C, and resistance ranges are defined in the three right-hand columns of this table. 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 300C. 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. (c) 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 Issue E * 10.05 123 Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series Table 6 mounting clip dimension (mm) See Fig. 11 Clip Type A B C D E F G ref. type nom. max nom. max max max 0.2 1601 1602 MD1 1603 52 70 90 68 86 106 29 19 17.5 14.5 4.8 4.0 3.9 7.2 MD16 H dia J dia K nom Auxiliary locking spring ref Welwyn Components MD4 1604 121 137 1605 108 128 1906 83 99 49 33 32.0 19.0 6.4 4.0 6.3 9.5 MD18 1607 125 146 MD3 1608 176 197 MD6 1609 240 261 Ordering Procedure Mounting clips (and auxiliary locking springs when required) should be ordered in units and the type reference specified. These mounting clips are suitable for termination styles C, CB and CP. MD4, 5 and 6 have an ear formed in the bottom surface of the bracket to prevent rotation of the mounting plate. The auxiliary locking springs ensure positive retention of the tube under severe mechanical shock conditions. See Figure 11. Table 7 Mounting brackets dimensions (mm). See Fig. 12. Bracket ref. MD40 Type 1600 1905 1601 1602 MD41 1603 1604 1906 MD42 1605 1606 1908 1607 MD43 1608 1609 A nom 78 73 50 68 91 119 81 106 183 119 121 171 235 B nom 92 87 64 82 105 133 95 120 197 133 143 193 257 28 30 5.2 20 25 5.2 13 20 4.2 C nom 10 D nom 20 E nom 4.2 Ordering Procedure Mounting brackets should be ordered in units and the type reference specified. These brackets are suitable for termination styles B, 4B, AP & AW Table 8 Mounting plug dimensions (mm) See Fig. 13. Type 1601 1602 1603 1604 1906 1605 1606 1908 1607 1608 1609 3.2 5.2 6.8 M6 1.6 3.7 5.3 M5 1.6 3.7 5.3 M4 A Min. B Max. C Ordering Procedure Mounting plugs are denoted by the prefix `F' added to the size reference; e.g. BF1602 and APF1602. F type bushes are suitable for termination styles B, 4B AP and AW (c) 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 126 Issue E * 10.05 Tubular Vitreous Enamelled Wirewound Resistors 1600/1900 Series Welwyn Components Ordering Procedure Specify the full type reference, resistance value and tolerance, using IEC 62 code references. The addition of L to the prefix describing terminal configuration indicates Ayrton-Perry winding. Example: Electrically live ferrule terminated 1601 size at 10 ohms and 5% C Adjustable Option Fixed V Adjustable 1601 - 10R J I Termination Style B AP AW 4B CB C CP See Figures 2 to 8 Winding & Mounting Options Standard L F Low Inductabce Mounting plug Tube Size Value (USE IEC62 code) Tolerance (use IEC62 code) F G J K 1% 2% 5% 10% Packing I Box Standard Note - consult data sheet in detail for valid combinations. Minimium Ordering Quantity: 10 Order Multiple: 1 (c) 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 Issue E * 10.05 |
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