Datasheet

Typical Applications (Continued)
Ground Referred Fahrenheit Thermometer
TL/H/5698–22
*Adjust R2 for 2.554V across LM336.
Adjust R1 for correct output.
Centigrade Thermometer
TL/H/5698–23
*Adjust for 2.7315V at output of LM308
Fahrenheit Thermometer
TL/H/5698–24
*To calibrate adjust R2 for 2.554V across LM336.
Adjust R1 for correct output.
THERMOCOUPLE COLD JUNCTION COMPENSATION
Compensation for Grounded Thermocouple
TL/H/5698–6
*Select R3 for proper thermocouple type
THERMO- R3 SEEBECK
COUPLE (
g
1%) COEFFICIENT
J 377X 52.3 mV/
§
C
T 308X 42.8 m V/
§
C
K 293X 40.8 mV/
§
C
S 45.8X 6.4 mV/
§
C
Adjustments: Compensates for both sensor and resistor tolerances
1. Short LM329B
2. Adjust R1 for Seebeck Coefficient times ambient temperature (in degrees
K) across R3.
3. Short LM335 and adjust R2 for voltage across R3 corresponding to ther-
mocouple type
J 14.32 mV K 11.17 mV
T 11.79 mV S 1.768 mV
6