$
Other Useful Data
Fahrenheit to Celsius Conversion
F = 9/5 (C°) + 32
C = 5/9 (°F -32)
Thermocouple Material
Temp. Range
J
Iron-Constantan
-346 to +1400°F
K
Chromel-Alumel
-450 to +2300°F
T
Copper-Constantan
-450 to +750°F
E
Chromel-Constantan
-450 to +1700°F
S
Platinum-Platinum
10% Rhodium
- 58 to +2650°F
R
Platinum-Platinum
13% Rhodium
- 58 to +2650°F
B
Platinum-6% Rhodium
-266 to +3300°F
Note: The thermocouple temperature ranges are NIST specified
material range, and do not indicate the useful range using the 470.
As can be seen in the thermocouple output curves, linearization is
not a significant factor for most thermocouples, particularly over a
limited range.
FIGURE 3.
0
500
1000
1500
2000
2500
3000
3500
4000
4500
TEMPERATURE IN FAHRENHEIT
0
10
20
30
40
50
60
70
80
MILLIVOLTS
THERMOCOUPLE OUTPUT BY TYPE
E
J
T
K
R
S
B
1
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Mechanical Specifications
Top View
Side View
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C
6
C
A
shielding the input leads in steel conduit may be required.
Ground loops, where both ends of the thermocouple wires or
the shield are grounded, should always be avoided. Only
ground one end of any shield. Stray magnetic fields can
induce large currents which in turn can cause normal mode
interference capable of swamping the amplifier. It is generally
best to ground the common of the amplifier. In the special case
where the thermocouple must operate at a high potential from
ground, the common of the amplifier should be connected to
one of the thermocouple inputs.
OMNI-AMP IV
