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參數(shù)資料
| 型號： | 203CT-4 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | THERMOPILE TYPE INFRARED SENSOR |
| 中文描述： | 熱電型紅外傳感器 |
| 文件頁數(shù)： | 19/44頁 |
| 文件大小： | 669K |
| 代理商： | 203CT-4 |
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19
3. Dimensions
29
27
27
33
Housing
Housing
Thermistor
Thermistor
Thermistor
Thermistor
Window
Window
Lead wire
Lead wire
Evaporator Pipe
18
R4.3
5
1
5
(mm)
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
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.
5. Specifications
FD Sensor
1) Environmental Temperature range : 40 C
2) Operating temperature range : 40 C
3) Sensitivity : 4 C 12 C
(Difference in temperature measured by both NTC Thermistors when no frost is recognized.)
6. Reliability
Climatic test properties
Test
7. Mechanical properties
Test
NTC Thermistor characteristics(only for reference)
Power Consumption
74.16KK Whr/month
65.6KK Whr/month
No. of defrost cycle completed
9 times/week
Once/week
Conventional Fixedtime defrost system
Defeost system with FD Sensor
Improved efficiency
12%
Criteria
Dry heat
Cold
Damp heat
Thermal shock
Test Conditions
In air at 100 C for 1,000hr.
In air at 55 C for 1,000hr.
95% RH at 40 C for 1,000hr.
Between 40 C and 75 C for 10,000 cycles.
Deviation of resistance at 25 C from the original value
after test within 2% and deviation of B value(B25 85)
from the original value after test is within 1%.
Criteria
Free Fall
Robustness of
termination
Test Conditions
3 natural drops from 75 cm high
40 N for 10 seconds
JIS C2571 Item A
Vibration
Deviation of resistance at 25 C from the original value
after test within 2% and deviation of B value(B25 85)
from the original value after test is within 1%.
Test Procedure
The power consumption measurement was carried out in accordance with JIS 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.
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.
80 C
5 C
1) Nominal Zero power resistance : R25 10k 3%
2) Rated B value
: B25 85 3435K 1%
3) Absolute difference between the two NTCs
: 0.2% or 0.05 C at 25 C
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