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E-701 View Datasheet(PDF) - SEMITEC Corporation

Part NameDescriptionManufacturer
E-701 SURGE ABSORBERS , SENSORS AND MODULES , THERMISTORS Semitec
SEMITEC Corporation Semitec
E-701 Datasheet PDF : 44 Pages
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FROST DETECTING SENSOR
FD SENSOR
The FD Sensor has been developed to detect the level of accumulated frost
on the evaporator in frost-free systems, such as those found in domestic
fridge-freezers. It helps to eliminate unnecessary defrost cycles and also
increases the energy efficiency of the system.
1. Application
Any frost-free system found in domestic and commercial fridge-freezers,
vending machines, ice-makers, etc.
2. Features
Simple detecting principle
Highly sensitive
Ease of assembly
Replaces less-efficient conventional sensors
3. Dimensions
29
27
Housing
18
5
5
R4.3
Lead wire
27
Thermistor
Window Thermistor
Thermistor
33
Window
Housing
Lead wire
1
Evaporator Pipe
Thermistor
(mm)
4. Findings from studies carried on the FD Sensor
Study (A)
A 12% of energy saving in a 420 liter domestic frost-free fridge-freezer was found by one of the major Japanese refrigerator manufacturers by the following test
procedures.
Test Procedure
The power consumption measurement was carried out in accordance with ЉJIS C9607 power consumption test, item B ( ISO8561).
The test procedure was extended to one week to determine the full advantage of the defrost system using the FD Sensor.
Conventional Fixedtime defrost system
Defeost system with FD Sensor
Improved efficiency
Power Consumption
74.16KK Whr/month
65.6KK Whr/month
12%
No. of defrost cycle completed
9 times/week
Once/week
Study (B)
Evaluation of the FD Sensor in a 130 liter domestic frost-free fridge-freezer was made by another Japanese refrigerator manufacturer.
They obtained an energy saving of over 10% using the same test method as in 5(A) above but including the opening and closing the fridge-freezers
doors.
Study (C)
Evaluation of the FD Sensor in a 400 liter domestic frost-free fridge-freezer made by a Japanese refrigerator manufacturer shows an energy saving of over 10%.
Measurement of this energy saving was made using the test method specified as in 5(A) above.
5. Specifications
NTC Thermistor characteristics(only for reference)
FD Sensor
1) Nominal Zero power resistance
: R25ϭ10kϮ3%
1) Environmental Temperature range : Ϫ40ЊCϳϩ80ЊC
2) Rated B value
: B25ր85ϭ3435K Ϯ1%
2) Operating temperature range
: Ϫ40ЊCϳϪ5ЊC
3) Absolute difference between the two NTCs : Ϯ0.2% or Ϯ0.05ЊC at 25ЊC
3) Sensitivity
: 4ЊCϳ12ЊC
(Difference in temperature measured by both NTC Thermistors when no frost is recognized.)
6. Reliability
Climatic test properties
Test
Dry heat
Cold
Damp heat
Thermal shock
Test Conditions
In air at 100ЊC for 1,000hr.
In air at Ϫ55ЊC for 1,000hr.
95% RH at 40ЊC for 1,000hr.
Between Ϫ40ЊC and ϩ75ЊC for 10,000 cycles.
Criteria
Deviation of resistance at 25ЊC from the original value
after test within Ϯ2% and deviation of B value(B25ր85)
from the original value after test is within Ϯ1%.
7. Mechanical properties
Test
Free Fall
Robustness of
termination
Vibration
Test Conditions
3 natural drops from 75 cm high
40 N for 10 seconds
JIS C2571 Item A
Criteria
Deviation of resistance at 25ЊC from the original value
after test within Ϯ2% and deviation of B value(B25ր85)
from the original value after test is within Ϯ1%.
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