Welwyn AWF1905-10RKI Tubular vitreous enamelled wirewound resistor Datasheet

Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
•
•
Impervious lead free vitreous enamel coating
•
Seven termination styles with choice of
mounting arrangements
•
Manufactured RoHS compliant
Pb-free terminations*
Can be supplied with fixed, adjustable,
tapped or low inductance winding
* 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 375°C.
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 70°C
Resistance range
Limiting element voltage
TCR (-55 to +200°C)
Resistance tolerance
Values
Thermal impedance
Operating temperature range
watts
ohms
volts
ppm/°C
%
Power rating at 70°C
Resistance range
Limiting element voltage
TCR (-55 to +200°C)
Resistance tolerance
Values
Thermal impedance
Operating temperature range
watts
ohms
volts
ppm/°C
%
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
°C/watt
°C
1605
47
1600
16.5
1908
54
Typically: <+75
1, 2, 5, 10
°C/watt
°C-55 to +375
1607
1606
76
91
See Table 1
See Table 1
1608
115
1609
165
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
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
Issue E · 10.05
121
Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
Electrical Data
(continued)
Table 1
*Dissipation (watts) to
produce operating
hotspot temperature (°C) of:
Ambient = 20°C
Resistance range (ohms)
Ambient
= 70°C
Limiting
element
voltage
Minimum
resistance at
Termination
style
Low inductance
winding resistance
range (ohms)
Min. res. at
200
300
375
375
±5%
±2%
±1%
Max. at
any
tolerance
C
All others
±10%
±5%
Max. at
either
tolerance
5
10
14
11
1
15
25
15k
250
150
10
50
1.3k
1905
7
14.5
20
16
1
15
30
30k
-
450
10
50
3.5k
1600
7.5
15
21
16.5
1
15
30
56k
-
600
10
50
5.0k
1602
8
15.5
22
17
1
20
25
43k
500
350
10
50
4.0k
1906
9.5
19
28
22
1
20
30
50k
700
550
10
50
5.5k
1603
11
22
32
25
1
20
30
83k
850
750
10
50
7.5k
1604
15.5
31
45
35
1
20
60
100k
1300
1000
15
50
11.5k
1605
21
41
59
47
1
30
40
100k
1100
900
15
50
14k
1908
24
47
68
54
1
30
40
100k
1200
1000
10
50
16k
1607
34
66
95
76
1
30
50
100k
1300
900
15
50
22k
1606
41
80
115
91
1
30
40
160k
2100
1900
15
50
32k
1608
52
101
145
115
1
30
50
180k
2100
1800
20
50
38k
1609
74
145
208
165
1
35
50
250k
3000
2500
30
100
58k
Type
1601
*The stated dissipation applies to resistors mounted horizontally with unobstructed bore.
Performance Data
Max
Typ
Load : 1000 hours at 70°C
∆R%
5.0
3.5
Shelf life : 12 months at room temperature
∆R%
1.0
0.1
Climatic
∆R%
0.5
0.35
Long term damp heat
∆R%
0.2
0.05
Bump and vibration
∆R%
0.1
0.02
Noise (in a decade of frequency)
∆R%
zero
Pulse Handling Data
zero
Available by request
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
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122
Issue E · 10.05
Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
Physical Data
Table 2 Dimensions in millimetres. See fig 2-8 for styles
A
B
C
D
E
F
G
H
Type
max
max
max
nom
max
max
nom
±.25
J
K
1601
33.0
17.5
8.2
4.5
5.0
19.5
15
3.0
M3
59
1905
56.1
14.5
6.55
4.5
5.0
17.5
10
3.0
M3
-
1600
61.5
14.5
6.55
4.5
5.0
17.5
10
3.0
M3
-
1602
51.0
17.5
8.2
4.5
5.0
19.5
15
3.0
M3
77
1906
64.3
17.5
8.2
4.5
5.0
19.5
15
3.0
M3
90
1603
74.5
17.5
8.2
4.5
5.0
19.5
15
3.0
M3
101
1604
102
17.5
8.2
4.5
5.0
19.5
15
3.0
M3
128
1605
89.5
24.0
13.2
5.7
6.8
26.5
17
4.0
M4
122
1908
102
24.0
13.2
5.7
6.8
26.5
17
4.0
M4
134
1607
102
32.0
19.2
7.0
9.8
32.0
22
6.4
M6
134
1606
166
24.0
13.2
5.7
6.8
26.5
17
4.0
M4
198
1608
152
32.0
19.2
7.0
9.8
32.0
22
6.4
M6
184
1609
216
32.0
19.2
7.0
9.8
32.0
22
6.4
M6
248
max
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
Ferrule, electrically isolated (Figure 6) Connection to
resistor via Pb free solder coated nickle iron lugs. Denoted
by prefix CB, thus: CB1602.
Lugs (Figure 2): Pb free solder coated nickel iron. Denoted
by prefix B to size reference, thus B1602
Ferrule, electrically live (Figure 7) Nickel plated brass.
Denoted by prefix C, thus: C1602.
Pigtails (Figure 3): 14/.193 mm copper, 150 mm minimum
length. Denoted by prefix AP, thus AP1602
Ferrule, electrically isolated (Figure 8): Connection to
resistor via pigtails of 14/.193 mm copper, 150mm
minimum length. Denoted by prefix CP thus: CP1602
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.
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.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
Issue E · 10.05
123
Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
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 300°C and the maximum dissipation, for
an ambient temperature of 20°C, is specified in Table 4. The
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
A mm
max.
B mm
max.
Hole C
dia. mm
Max. no of
adjusting
bands
20
27
3.2
1
1605
20
27
3.2
3
1908
25
32
3.7
2
1606
25
32
3.7
4
1607
30
38
3.7
2
1608
30
38
3.7
3
1609
30
38
3.7
5
1602
1603
1906
1604
Table 4
Max. dissipation in
20°C ambient (watts)
Type
Resistance range (ohms)
200°C
hot spot
300°C
hot spot
Min. for
styles VC,
VCP
Min. for
all other
styles
Max. for
all styles
1602
8
15.5
4
3
1.6k
1906
9.5
19
4
3
2.5k
1603
11
22
6
6
3.0k
1604
16
31
8
8
5.3k
1605
21
41
6
6
4.5k
1908
24
47
11
10
7.5k
1607
34
66
11
9
8.1k
1606
41
80
14
13
13.2k
1608
52
101
17
16
15.4k
1609
74
145
25
24
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.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
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124
Issue E · 10.05
Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
Tapped Resistors See Figure 10
Ordering Procedure
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.
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
The minimum resistance per section on all sizes is 1Ω and the
standard selection tolerance for any section is ±10%
Type of terminations required. (See ‘Terminations’, page 3)
Resistor style or proposed method of mounting.
Table 5
Maximum*
resistance
with single
tap
(ohms)
Maximum*
number
of taps
Type
Maximum*
total
dissipation
in 20°C
ambient
(watts) with
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
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.
*Maximum total dissipation assumes that this will be
evenly spread over the total element length.
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.
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
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123
Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
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
52
1602
70
86
MD1 1603
90
106
H
dia
J
dia
K
nom
Auxiliary
locking
spring ref
4.0
3.9
7.2
MD16
68
29
19
17.5 14.5 4.8
MD4 1604 121 137
1605 108 128
1906
83
99
Ordering Procedure
1607 125 146
MD3 1608 176 197
49
33
32.0 19.0 6.4
4.0
6.3
9.5
MD18
MD6 1609 240 261
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.
Type
A
nom
B
nom
C
nom
D
nom
E
nom
MD40
1600
78
92
10
20
4.2
1905
73
87
1601
50
64
1602
68
82
1603
91
105
13
20
4.2
1604
119
133
20
25
5.2
28
30
5.2
MD41
MD42
MD43
1906
81
95
1605
106
120
1606
183
197
1908
119
133
1607
121
143
1608
171
193
1609
235
257
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
A
B
C
Min.
Max.
1.6
3.7
5.3
M4
1.6
3.7
5.3
M5
1601
1602
1603
1604
1906
1605
1606
1908
Ordering Procedure
1607
1608
3.2
5.2
6.8
1609
M6
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
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
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126
Issue E · 10.05
Tubular Vitreous Enamelled
Wirewound Resistors
Welwyn Components
1600/1900 Series
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
1601
-
10R
J
I
Adjustable Option
Fixed
V
Adjustable
Termination Style
B
AP
AW
4B
CB
C
CP
See Figures 2 to 8
Winding & Mounting Options
Standard
L
Low Inductabce
F
Mounting plug
Tube Size
Value (USE IEC62 code)
Tolerance (use IEC62 code)
F
1%
G
2%
J
5%
K
10%
Packing
I
Box
Standard
Note - consult data sheet in detail for valid combinations.
Minimium Ordering Quantity: 10
Order Multiple: 1
© Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 · Facsimile: +44 (0) 1670 829465 · Email: [email protected] · Website: www.welwyn-tt.com
Issue E · 10.05
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