Simple Structure High Stability NTC Temperature Sensor Use For
Refrigerator
Description
Thermistor probes are invaluable for sensing temperature levels in
a variety of industries ranging from HVAC and food handling to
automotive and laboratory research. In such applications, it's
critical that the thermistor probe used is accurate to ensure
reliable thermal monitoring.
A world-class provider of thermistors and thermistor probes and
assemblies, We offers temperature probes designed and built from
the ground up. The thermistors we use are created from a precise
blend of raw materials and processed using proprietary techniques
that result in superior discrete components, probes and assemblies.
We manufactures laboratory grade temperature probes, surface
temperature sensing probes, micro probes, as well as many others
designed to suit specific applications. Our application engineers
are experts in the design of temperature sensing probes and
assemblies utilizing thermistors as well as RTDs suitable for the
most demanding applications.
| 25deg.C |
| 5k 10k |
| Epoxy-----mainly used for indoor Copper ----mainly used for outdoor
|
| air conditioner |
| 1. Wide operating temperature range, good stability and
reliability.
2. Easy to installation and manipulation as the sealing can be done
according to environment
and conditions there it is applied by customer.
3. Accurate testing can reflect temperature change precisely.
4. Insulating resistance(MΩ): over 100MΩ at DC500 V
5. Working temperature range(°C): -10 to +105c
6. Dissipation factor(mw/°C): 1-2 (in still air) |
►Different NTC thermistor using in the NTC temperature sensors with
the following different operating temperature:
Chip or MF52A,MF51E,MF55: temperature resist grade 125℃,actual
temperature resist grade 150℃
MF58: temperature resist grade 200℃,actual temperature resist grade
250℃
MF51: temperature resist grade 200℃,actual temperature resist grade
250℃
Special MF51: temperature resist grade 250℃,actual temperature
resist grade 300℃
Weldless chip:temperature resist grade 450℃,actual temperature
resist grade 500℃
►Operating environment
In the environment of high temperature,high humidty and high
corrosion,we suggest to use glass sealed type thermistor as the
core element.And MF51 type will be the best NTC thermistor in high
humidity environment.
►Design considerations and procedure of temperature sensor:
1. Choose the shape acoording to customer's design or assemble
requirements, and confirm the thermistor.
2. Confirm the thermistor element and other materials according to
customers' requirement
3. Choose the suitable resistance,B value and tolerance
4. Choose suitable moisture-proof and insulation technology to meet
customer's requirement
5. Choose suitable encapsulation structure to meet performance
requirements of mechanical shock resistance
6. Meet customer's special requirements.
Working principle of temperature sensor
Using the NTC thermistor under a certain measurement power, the
resistance value drops rapidly as the temperature rises. Utilizing
this feature, the NTC thermistor can be used to determine the
corresponding temperature by measuring its resistance value, so as
to achieve the purpose of detecting and controlling the
temperature.
Reliability Test
| Test Item | Test Standard | Test method | Performance requirements |
| Zero Power Resistance | IEC 60539-1 | Immerse samples in the constant temperature bath at 25℃±0.005℃,test
steady resistance | Resistance tol ±1%
|
| B value | IEC60539-1 | Immerse samples in the constant temperature bath at 25℃,50℃(or
85℃), test steady resistance,and calculate B value | Resistance tol ±1%
|
| Free fall | IEC60068-2-32
| Fall height: 1.5±0.1m,Surface: Cement , 1 time | No obvious damage, R25 △R/R≤±1%
|
| Insulation | IEC60539-1
| 500V pressure on insulation shell test insulation resistance | >500MOhm
|
| Withstand voltage | IEC60539-1 | Withstand voltage: 1500V/AC ,Leakage current:2mA Lasting: 60sec
| No obvious damage
|
| Tension | IEC60068-2-21 | Pull uniform speed at the end, F>4.0KG(requested by customer)
| No obvious damage, R25 △R/R≤±1%
|
| Vibration | Q/HBm 108-94 | Test frequency: 10~500Hz,swing: 1.2mm acceleration: 30m/s2
Direction X,Y,Z Time:8Hour/direction | No obvious damage, R25 △R/R≤±1%
|
| Steady humidity and heat | IEC60068-2-78 | Temp:40±2℃ Humidity:92-95%RH Time:1000±24Hour | No obvious damage, R25 △R/R≤±1%
|
| Thermal time constant | EC60539-1 | Immerse in 25℃ water,after thermal balance,immerse in
85℃,resistance arrives 63.2%,calculate total time | <10 sec
|
| High temperature storage | IEC60068-2-2 | Temp:125℃±5℃ Time: 1000±24Hour | No obvious damage, R25 △R/R≤±1% |
| Cold and thermal shock | IEC60068-2-14 | -40℃~+125℃ T1:30min Cycle time:1000
| No obvious damage, R25 △R/R≤±1%
|
| Knock experiment | IEC60068-2-77 | Acceleration:250m/s2 Pulse lasting: 6ms Knock times: 1000 Recovery
time: 2 Hour
| No obvious damage, R25 △R/R≤±1%
|
| Low temperature storage | IEC60068-2-1 | Temp: 40±2℃ Time: 1000±24Hour
| No obvious damage, R25 △R/R≤±1%
|
| Salt spray | IEC60068-2-11 | Temp: 35±2℃ Collection hour : 1.0mL~2.0mL Time: determine per as
actual demand | No obvious damage, R25 △R/R≤±1%
|
Application
