PTC thermistors as
point level sensors
Stainless steel case, water level sensing
Series/Type:
Date:
B59050D1100B040
January 2016
© EPCOS AG 2016. 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.
Sensors
Point level sensor, stainless steel case, water level sensing
D1050
Applications
Liquid level detection in water tanks and
home appliances
Features
Hermetically sealed stainless steel case
Solderability complies with IEC 60068-2-20
RoHS-compatible
Delivery mode
Bulk
Dimensional drawing
Dimensions in mm
General technical data
Max. operating voltage
Rated resistance
Operating temperature range
Operating temperature range
Number of cycles
Residual current in water
Residual current in air
Settling time
Surface temperature
Ordering code
Ordering code
B59050D1100B040
V
max
R
R
T
op
T
op
N
I
r,oil
I
r,air
t
E
T
surf
18
40 ... 80
55/+100
+10/+65
5000
see diagram
see diagram
60
< 80
V DC
Ω
°C
°C
mA
mA
s
°C
(V = 0 V)
(V = 18 V)
(R
S
= 50
Ω,
V = 18 V)
(V = 18 V)
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 2 of 10
Sensors
Point level sensor, stainless steel case, water level sensing
D1050
Test set-up
Unclipped leads, held at the ends by clamps
Sensor in vertical position
Distance of clamping point to body:
min. 15 mm
Pellet points downwards
Settling time after application of voltage:
60 s
Circuit diagram
Limits of operating range
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 3 of 10
Sensors
Point level sensor, stainless steel case, water level sensing
D1050
Reliability data
Test
Electrical endurance,
cycling
Electrical endurance,
constant
Damp heat
Standard
Test conditions
V = 19 V; R
S
= 100
Ω
T
air
= 25
°C,
T
oil
= 50
°C
Number of cycles: 5000
Storage at V
max
and T
op,max
(@ V
max
)
Test duration: 1000 h
Temperature of air: 40
°C
Relative humidity of air: 93%
Duration: 56 days
Test according to IEC 60068-2-78
T
1
= T
op,min
(0 V), T
2
= T
op,max
(0 V)
Number of cycles: 5
Test duration: 30 min
Test according to IEC 60068-2-14, test Na
Frequency range: 10 to 55 Hz
Displacement amplitude: 0.75 mm
Test duration: 3
×
2 h
Test according to IEC 60068-2-6, test Fc
∆R
25
/R
25
< 25%
IEC 60738-1
IEC 60738-1
< 25%
< 25%
Rapid change
of temperature
IEC 60738-1
< 25%
Vibration
IEC 60738-1
< 5%
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 4 of 10
Sensors
Point level sensor, stainless steel case, water level sensing
D1050
Cautions and warnings
General
EPCOS thermistors are designed for specific applications and should not be used for purposes
not identified in our specifications, application notes and data books unless otherwise agreed
with EPCOS during the design-in-phase.
Ensure suitability of thermistor through reliability testing during the design-in phase. The ther-
mistors should be evaluated taking into consideration worst-case conditions.
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 hu-
midity
≤75%
annual mean, maximum 95%, dew precipitation is inadmissible.
Avoid contamination of thermistors surface during storage, handling and processing.
Avoid storage of thermistor in harmful environment with effect on function on long-term opera-
tion (examples given under operation precautions).
Use thermistor within the following period after delivery:
Through-hole devices (housed and leaded PTCs): 24 months
Motor protection sensors, glass-encapsulated sensors and probe assemblies: 24 months
Telecom pair and quattro protectors (TPP, TQP): 24 months
Leadless PTC thermistors for pressure contacting: 12 months
Leadless PTC thermistors for soldering: 6 months
SMDs in EIA sizes 3225 and 4032, and for PTCs with metal tags: 24 months
SMDs in EIA sizes 1210 and smaller: 12 months
Handling
PTCs must not be dropped. Chip-offs must not be caused during handling of PTCs.
The ceramic and metallization of the components must not be touched with bare hands. Gloves
are recommended.
Avoid contamination of thermistor surface during handling.
Soldering (where applicable)
Use rosin-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.
Standard PTC heaters are not suitable for soldering.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
Page 5 of 10
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