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Probe
Typical
Type
Application
B
Kiln
K
General purpose
N
Furnace, kiln
R/S
Kiln
The standard probes for furnace operation are type K: they have a hot junction
combining nickel-chromium alloy and nickel-aluminum alloy.
International specifications for type K define a sensitivity and linearity over the
range 0–1,370°C/32–2,498°F (see below). The practical operating range is
limited by the properties of the cable insulation (normally PTFE, mineral or
ceramic fiber; see below) or metallic sheathing.
Never connect thermocouples to mains electricity. This could cause major injury
Take care when handling thermocouple cables to avoid accidental damage to the
Thermocouple Specifications
Probe
Temperature
Type
Range*
B
Contact Fluke
Process Instruments
K
0°C to 1,370°C/
32°F to 2.498°F
N
0°C to 1,300°C/
32°F to 2,372°F
R/S
0°C to 1,760°C/
32°F to 3,200°F
*
The cable insulation material limits the actual operating temperature (see below).
20
Basic Hardware
IEC
Plug/Socket Color
Gray
Green
Pink
Orange
WARNING
or death.
eyes by sharp thermocouple-tips.
Cable
Accuracy of Datapaq
Insulation
Probes
PTFE,
0–1,250°C ±1.1°C/
ceramic,
32°F to 2,282°F ±2°F
mineral
or ±0.4%, whichever is greater
insulation,
(ANSI MC96.1)
glass fiber
Mineral
0–1,300°C ±1.1°C/
insulation
32°F to 2,372°F ±2°F
only
or ±0.4%, whichever is greater
(ANSI MC96.1)
Ceramic
0–1,000°C ±1.1°C; 1,100–
tube
1,600°C ±1°C +
0.003(t−100)°C, where
t = measurement temperature
Previous
Plug/Socket Color
White
Yellow
Orange
Green
FURNACE TR ACK ER
Notes
Datapaq probes
are Nicrobell™
sheathed for
high-temperature
operation
Not available
from Fluke
Process
Instruments
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