Thermocouple Mode
Thermo
couple
Connection
block
Cold
junction
sense
TEDS
Class 2
MAX31826
Signal conditioner
Signal (+)
+
-
+V
-V
10 MΩ
10 MΩ
Signal (-)
Teds (+)
Teds (-)
Signal ground
TEDS Control
Cold junction reading
Amplifier
Figure A.235:
Thermocouple mode block diagram
Linearization for thermocouples
K, J, T, B, E, N, R, S, C
Cold junction compensation
Digital 1
-
wire readout of MAX31826 or DS18S20 digital thermometer
Filtered bandwidth
0.1 Hz to 5Hz (Bessel), 0.25 Hz to 12.5 Hz (Butterworth and Elliptic)
Connector cable
Connection box
TEDS support
Class 2 (no software support at release date)
Types
Temperature range
Typical
(1)
Maximum
(1)
Type B
From 100° C to 200° C (212° F to 392° F)
±
1.4° C (
±
2.52° F)
±
7° C (
±
12.6° F)
From 200° C to 500° C (392° F to 932° F)
±
0.75° C (
±
1.35° F)
±
3.5° C (
±
6.3° F)
From 500 °C to 1820° C (932° F to 3308° F)
±
0.5° C (
±
0.9° F)
±
2°C (
±
3.6° F)
Type C
From 0° C to 1000° C (32° F to 1832° F)
±
0.6° C (
±
1.08° F)
±
1.5° C (
±
2.7° F)
From 1000° C to 2315° C (1832° F to 4199° F)
±
1.5° C (
±
2.7° F)
±
3°C (
±
5.4° F)
Type E
From
-
200 °C to 900° C (
-
328° F to 1652° F)
±
0.4°C (
±
0.72° F)
±
0.8°C (
±
1.44° F)
Type J
From
-
210° C to 1200° C (
-
346° F to 2192° F)
±
0.5° C (
±
0.9° F)
±
1°C (
±
1.8° F)
Type K
From
-
200° C to 1372° C (
-
328° F to 2501.6° F)
±
0.6° C (
±
1.08° F)
±
1°C (
±
1.8° F)
Type N
From
-
250°C to
-
100°C (
-
418° F to
-
148° F)
±
1.25°C (
±
2.25° F)
±
2.5°C (
±
4.5° F)
From
-
100°C to 1300°C (
-
148° F to 2372° F)
±
0.5° C (
±
0.9° F)
±
1°C (
±
1.8° F)
Type R
From
-
50° C to 0° C (
-
58° F to 32° F)
±
1°C (
±
1.8° F)
±
2°C (
±
3.6° F)
From 0° C to 1100° C (32° F to 2012° F)
±
0.5° C (
±
0.9° F)
±
1°C (
±
1.8° F)
From 1100° C to 1768° C (2012° F to 3214.4° F)
±
0.7°C (
±
1.26° F)
±
1.4°C (
±
2.52° F)
Type S
From
-
50° C to 0° C (
-
58° F to 32° F)
±
1°C (
±
1.8° F)
±
2°C (
±
3.6° F)
From 0° C to 1100° C (32° F to 2012° F)
±
0.5° C (
±
0.9° F)
±
1°C (
±
1.8° F)
From 1100° C to 1768° C (2012° F to 3214.4° F)
±
0.7°C (
±
1.26° F)
±
1.4°C (
±
2.52° F)
Type T
From
-
260°C to
-
100°C (
-
436° F to
-
148° F)
±
2°C (
±
3.6° F)
±
4°C (
±
7.2° F)
From
-
100° C to 400° C (
-
148° F to 752° F)
±
0.3°C (
±
0.54° F)
±
0.6°C (
±
1.08° F)
(1)
Measured using Bessel filter at 5 Hz bandwidth.
Thermocouple Wire Diagram
Thermocouple
1-G089-2 with cold junction
1-KAB2124-3
Figure A.236:
Recommended thermocouple tools
GEN3i
I3763-3.1 en HBM: public
651