Datasheet

DATA SHEET
Technical changes reserved
0141 0316-115 07/2009
Thermocouple module
with digital I²C-Interface - THMOD-I²C
The respective elements are not compatible among each other be-
cause these are from different alloys. The elements deliver different
thermo voltages. The most frequently used thermo medium is the type
“K“ that is manufactured from the NiCr-Ni metal alloy. The application
temperature range of this type reaches up to 1200 °C.
Finally, thermocouples only consist of a twisted, welded conductor pair,
which can be produced from thin wires as an example. Because of its
low thermal mass, the response time is extremely fast.
Tolerance limits
As per IEC 584, three tolerance classes are dened, which are valid
for delivery condition of thermopairs from 0.25 to 3 mm. As per material
and application temperature, the thermocouples are subject to certain
ageing through diffusion of foreign materials.
The characteristics of thermo voltage over the temperature is not linear
and must be corrected with the subsequent electronics or software.
The electronics normally also takes care of the measurement and
compensation of the connection voltage.
The mechanical designs of thermocouples are very diverse. The metal
sheathed thermocouples occupy a special position. The thermowi-
res are embedded in a compact insulation of magnesium-oxide and
housed in a metal sheath of stainless steel or Inconel (nickel-alloy).
Metal sheath thermocouples are hermetically sealed, exible and me-
chanical very robust. The compact insulation completely holds the wi-
res so that internal short circuits are practically impossible.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon [phone] | Fax [phone] | [e-mail] | bb-sensors.com
5 / 5