LM135, LM135A, LM235, LM235A, LM335, LM335A

SNIS160D – MAY 1999 – REVISED MARCH 2013

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Figure 28. Single Power Supply Cold Junction Compensation

*Select R3 and R4 for thermocouple type

THERMO-COUPLE

R3

R4

SEEBECK COEFFICIENT

J

1.05K

385

Ω

52.3

μV/°C

T

856

Ω

315

Ω

42.8

μV/°C

K

816

Ω

300

Ω

40.8

μV/°C

S

128

Ω

46.3

Ω

6.4

μV/°C

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 corresponding to thermocouple.

J

14.32 mV

T

11.79 mV

K

11.17 mV

S

1.768 mV

10

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