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Caps Materials, Characteristics and Application

SN

Cap Materials

Model

Characteristics

Application

1

ABS

SP1

Damp proofing, Antisepsis, Low cost, Enduring voltage
Working temperature-50~80

Icebox, Air-conditioner

2

PVC

SP2

3

PP

SP3

4

PA6

SP4

5

Copper

SC1

Damp proofing, Heat transmitting, Enduring temperature shock.

Air-conditioner, Water heater,

6

Nickel plated copper

SC2

Damp proofing, Heat transmitting, Enduring temperature shock, Antisepsis

7

Stainless steel

SS1

Intensity, Damp proofing, Enduring temperature shock, Antisepsis, High temperature application

Home electric appliance, Barbecue, Refrigeratory

Practical Caps size

Materials

Diametermm

Lengthmm

 

Plastic Shell

579

253050

 

(Client decides)

Copper Shell

4568

20253045

Stainless Steel Shell

345678

20253045

 

 

 

Comparison with different temperature sensors

Sensor Type

NTC Thermistor sensor

Winding Pt Sensor

Film Pt sensor

Semiconductor IC sensor

Materials

Ceramic

Winding Pt wire

Film Pt

Silicon

Relative cost

Low

High

Middle

Middle

Temperature range

-100~500

-200~600

-150~500

-55~150

Sensitivity

-4%/

0.39%/

0.39%/

0.81%/

Relative sensitivity

Very high

Very low

Very low

Low

Linearity

Logarithm

Linearity

Linearity

Linearity

Allowed current

Small

Big

Relatively big

 

Slope

Negative

Positive

Positive

Positive

 

R-T Curve

R-T CHARACTERISTICS
  • R-T CHARACTERISTICS
R-T CHARACTERISTICS COMPARISON
  • COMPARISON OF R-T CHARACTERISTICS

 

Professional Glossary for Thermistor Temperature Sensor
A. Zero Power Resistance Value
The zero-power resistance is the resistance value of a thermistor measured at a specified temperature with power dissipated by the thermistor low enough that any further decrease in power will result in not more than 0.1% (or one tenth of the specified measurement tolerance, whichever is smaller) change in resistance.
Nominal Resistance (Rated zero power resistance) R25
Zero power resistance value at 25
B. B Value
The material constant of a thermistor, Unless otherwise specified, Beta is derived from thermistor resistance measurements obtained at 0 and 50C.

RT1=Zero power resistance at T1; RT2=Zero power resistance at T2
C. Dissipation coefficient
The dissipation constant is the ratio, (expressed in milliwatts per degree C) at a specified ambient temperature, of a change in power dissipation in a thermistor to the resultant body temperature change.
=P/T
D. Thermal time constant
The thermal time constant is the time required for a thermistor to change 63.2% of the total difference between its initial and final body temperature when subjected to a step function change in temperature under zero-power conditions.

Cautious About Using Temperature Sensor
To avoid quick aging acute temperature change should be shun.
To avoid temperature error and product damage we should minimize the current passing through the sensor when designing the circuit.
To avoid error Thermistor should be measured in the constant temperature vessel.

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