LM135 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

LM135

PRECISION TEMPERATURE SENSORS

STMicroelectronics 

LM135-LM235-LM335,A

THERMOCOUPLE COLD JUNCTION COMPENSATION

(compensation for grounded thermocouple)

+15V

4.7kΩ

200kΩ

R2

1%

R3*

1N4568 10

kΩ

1MΩ

1%

LM135

LM235

LM335

R1

10kΩ

12kΩ

71.5kΩ

1%

Th ermo-

couple

J

T

K

S

R3

377Ω

308Ω

293Ω

45.8Ω

Seebeck

Coefficient

52.3µV/oC

42.8µV/oC

40.8µV/oC

6.4µV/oC

Adjustments : compensates for both sensor

and resistor tolerances.

1. Short 1N4568.

2. Adjust R1 for SEEBECK coefficient times

ambient temperature (in degrees K) across

R3.

3. Short LM135 and adjust R2 for voltage

across R3 corresponding to thermocouple

type.

J 14.32mV

K 11.17mV

T 11.79mV

S 1.768mV

Thermocouple

-15V

* Select R3 for proper thermocouple type

SINGLE POWER SUPPLY COLD JUNCTION COMPENSATION

+15V

10kΩ

200kΩ

LM135

LM235

LM335

R1

R3*

10kΩ

+15V

Thermo-

couple

J

T

K

S

R3

1.05kΩ

856Ω

816Ω

128Ω

R4

365Ω

315Ω

300Ω

46.3Ω

Seebeck

Coefficient

52.3µV/oC

42.8µV/oC

460..48µµVV//ooCC

Thermocoup le

Adjustments :

1. Adjust R1 for the voltage across R3 equal

to the SEEBECK coefficient times ambient

temperature in degrees Kelvin.

2. Adjust R2 for voltage across R4 correspon-

ding to thermocouple.

J 14.32mV

K 11.17mV

T 11.79mV

S 1.768mV

1N4568

R2

10

kΩ

200kΩ

1MΩ

Output

R4*

* Select R3 and R4 for proper thermocouple

9/11

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