NTC thermistors for
temperature measurement
Probe assemblies
Series/Type:
Date:
B57514K
January 2018
© EPCOS AG 2018. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS' prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
Temperature measurement
Probe assemblies
B57514K
K514
Applications
Temperature measurement in household
appliances (e.g. dryers, cookers, small
appliances)
Features
NTC thermistor assembled in a stainless
steel case with cable outlet
Temperature range 20 to 200
°C
Wire heat-resistant up to 200
°C
(PTFE-insulated wire in fiberglass sleeve)
Fast and simple flange installation
Options
Alternative casing, cable lengths,
R/T characteristics, connectors available
on request.
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
Approx. weight 4.5 g
General technical data
Climatic category
Resistance tolerance
Rated temperature
Dissipation factor
Thermal time constant
Insulation resistance
Test voltage
(IEC 60068-1)
∆R
R
/R
R
T
R
δ
th
τ
a
R
ins
V
test
20/200/42
±2.5
100
approx. 3
approx. 3
> 100
1250
(in air)
(in water)
(V = 500 V DC)
(t = 1 s)
%
°C
mW/K
s
MΩ
V AC
Electrical specification and ordering codes
R
100
Ω
3300
R
25
Ω
48538
No. of R/T
characteristic
7002
B
25/100
K
3988
±1%
Ordering code
B57514K0493A001
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 11
Temperature measurement
Probe assemblies
B57514K
K514
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 3%
Remarks
No visible
damage
Storage in damp
heat, steady state
Rapid temperature
cycling
Voltage proof test
Insulation test
Storage at upper category
temperature
T: 200
°C
t: 1000 h
IEC
Temperature of air: 85
°C
< 3%
60068-2-67 Relative humidity of air: 85%
Duration: 1000 h
Lower test temperature: 20
°C
< 3%
Upper test temperature: 200
°C
Number of cycles: 1000
Medium: air
Applied voltage between metal
housing and sensor wires:
1250 V AC/60 s
The sensors are placed in a
vessel containing metallic balls
of 1 mm diameter (with total
immersed head) at room
temperature. The applied voltage
is 500 V DC.
No visible
damage
No visible
damage
No flashover
Above
100 MΩ
Note
Contact of NTC thermistors with any liquids and solvents shall be prevented. It must be
ensured that no water enters the NTC thermistors (e.g. through plug terminals).
Avoid dewing and condensation unless thermistor is specified for these conditions.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 11
Temperature measurement
Probe assemblies
B57514K
K514
R/T characteristics
R/T No.
7002
T (°C) B
25/100
= 3988 K
T (°C)
R
T
/R
25
α
(%/K)
55.0
50.0
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
96.33
66.866
47.037
33.508
24.156
17.613
12.98
9.6643
7.2656
5.5129
4.22
3.2575
2.5348
1.9876
1.5699
1.2488
1.0000
0.80594
0.65355
0.53312
0.43735
0.36074
0.29911
0.24925
7.4
7.2
6.9
6.7
6.4
6.2
6.0
5.8
5.6
5.4
5.3
5.1
4.9
4.8
4.6
4.5
4.4
4.3
4.1
4.0
3.9
3.8
3.7
3.6
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
105.0
110.0
115.0
120.0
125.0
130.0
135.0
140.0
145.0
150.0
155.0
160.0
165.0
170.0
175.0
180.0
B
25/100
= 3988 K
T (°C)
R
T
/R
25
α
(%/K)
0.20872
0.17558
0.14837
0.12592
0.10731
0.091816
0.078862
0.067988
0.058824
0.051071
0.044489
0.03888
0.034084
0.02997
0.02643
0.023373
0.020727
0.018429
0.016427
0.014679
0.013149
0.011806
0.010623
0.0095804
3.5
3.4
3.3
3.2
3.2
3.1
3.0
2.9
2.9
2.8
2.7
2.7
2.6
2.5
2.5
2.4
2.4
2.3
2.3
2.2
2.2
2.1
2.1
2.0
185.0
190.0
195.0
200.0
205.0
210.0
215.0
220.0
225.0
230.0
235.0
240.0
245.0
250.0
255.0
260.0
265.0
270.0
275.0
280.0
285.0
290.0
295.0
300.0
B
25/100
= 3988 K
R
T
/R
25
α
(%/K)
0.0086582
0.0078408
0.0071148
0.0064685
0.005892
0.0053767
0.0049152
0.0045011
0.0041287
0.0037934
0.0034908
0.0032173
0.0029697
0.0027451
0.0025412
0.0023556
0.0021865
0.0020323
0.0018913
0.0017623
0.0016441
0.0015357
0.001436
0.0013444
2.0
2.0
1.9
1.9
1.8
1.8
1.8
1.7
1.7
1.7
1.6
1.6
1.6
1.6
1.5
1.5
1.5
1.5
1.4
1.4
1.4
1.4
1.3
1.3
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 11
Temperature measurement
Probe assemblies
B57514K
K514
Cautions and warnings
General
See "Important notes" on page 2.
Storage
Store thermistors only in original packaging. Do not open the package prior to processing.
Storage conditions in original packaging: storage temperature 25
°C
... +45
°C,
relative
humidity
≤75%
annual mean, <95% maximum 30 days per annum, dew precipitation is
inadmissible.
Do not store thermistors where they are exposed to heat or direct sunlight. Otherwise, the
packing material may be deformed or components may stick together, causing problems during
mounting.
Avoid contamination of thermistor surface during storage, handling and processing.
Avoid storage of thermistors in harmful environments like corrosive gases (SO
x
, Cl etc).
Use the components as soon as possible after opening the original packaging.
Solder thermistors within the time specified after shipment from EPCOS.
For leaded components this is 24 months, for SMD components with nickel barrier termination
12 months, for leadless components this is 12 months, for SMD components with AgPd
termination 6 months.
Handling
NTC thermistors must not be dropped. Chip-offs or any other damage must not be caused
during handling of NTCs.
Do not touch components with bare hands. Gloves are recommended.
Avoid contamination of thermistor surface during handling.
Washing processes may damage the product due to the possible static or cyclic mechanical
loads (e.g. ultrasonic cleaning). They may cause cracks to develop on the product and its parts,
which might lead to reduced reliability or lifetime.
Bending / twisting leads
A lead (wire) may be bent at a minimum distance of twice the wire’s diameter plus 4 mm from
the component head or housing. When bending ensure the wire is mechanically relieved at the
component head or housing. The bending radius should be at least 0.75 mm.
Soldering
Use resin-type flux or non-activated flux.
Insufficient preheating may cause ceramic cracks.
Rapid cooling by dipping in solvent is not recommended.
Complete removal of flux is recommended.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 11
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