Temperature measurement
Probe assemblies with O-ring sealing
B57301K
K301-A001
Applications
Immersion probe for water boilers
Features
Nickel-plated brass housing
Compact design
Fast and easy mounting
G1/8'' thread to ISO 228/1
Tab connector, lead spacing 3.96 mm
Options
Alternative resistance ratings, rated
temperatures and resistance tolerances
available on request.
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
Approx. weight 12 g
General technical data
Climatic category
Maximum operating temperature
Max. power
Resistance tolerance
Rated temperature
Thermal time constant
Insulation resistance
Test voltage
(IEC 60068-1)
(at 25
°C)
T
op,max
P
25
∆R
R
/R
R
T
R
τ
a
R
ins
V
test
30/110/56
110
375
±2
60
approx. 5
> 100
2500
°C
mW
%
°C
s
MΩ
V AC
(in water)
(V = 500 V DC)
(t = 1 s)
Electrical specification and ordering codes
R
60
Ω
3000
R
25
Ω
9959
No. of R/T
characteristic
2908
B
25/100
K
3460
±1%
Ordering code
B57301K0103A001
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 9
Temperature measurement
Probe assemblies with O-ring sealing
B57301K
K301-A001
Reliability data
Test
Storage in
dry heat
Standard
IEC
60068-2-2
Test conditions
∆R
25
/R
25
(typical)
< 2%
Remarks
No visible
damage
Storage in damp
heat, steady state
Rapid temperature
cycling
Storage in water
Vibration
resistance
Voltage proof test
Storage at maximum operating
temperature
T: 110
°C
t: 1000 h
IEC
Temperature of air: 40
°C
60068-2-78 Relative humidity of air: 93%
Duration: 56 days
IEC
Lower test temperature: 20
°C
60068-2-14 Upper test temperature: 90
°C
Dwell time: 15 s
Time to change from lower to
upper temperature: approx. 5 s
Number of cycles: 60 000
Medium: ethyleneglycol/water
(metal head immersed to the
liquid medium up to the sealing)
Temperature of water: 80
°C
t: 1000 h
Applied voltage with drop resistor
3.9 kΩ: 5 V DC
(metal head immersed to the
liquid medium up to the sealing)
IEC
Frequency range: 10 to 1000 Hz
60068-2-6
Amplitude: 1.5 mm, 10
g
Duration: 3 x 4 h
2500 V AC
1s
< 2%
No visible
damage
No visible
damage
< 2%
< 2%
No visible
damage
< 2%
No visible
damage
No flashover
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 9
Temperature measurement
Probe assemblies with O-ring sealing
B57301K
K301-A001
Cautions and warnings General
See "Important notes" at the end of this document.
Storage
Store thermistors only in original packaging. Do not open the package prior to storage.
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 factory seals, i.e. the
polyvinyl-sealed packages.
Solder thermistors within the time specified after shipment from EPCOS.
For leaded components this is 24 months, for SMDs 12 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.
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.
Twisting (torsion) by 180° of a lead bent by 90° is permissible at 6 mm from the bottom of the
thermistor body.
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 9
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