Measured value correction and compensation
However, the cold junction temperature can also be measured using an exter-
nal measuring sensor (Pt100 or NTC) in an isothermal block (see Manual
6.7.3); this must be located upstream from the thermocouples and the first 2
characters of the channel designation must have been programmed with con-
trol code ´*J´ (see 13.2.1). As and when necessary the cold junction tempera-
ture can be checked with function channel ´CJ´. This can also be used as de -
vice temperature.
For especially exacting requirements (e.g. for thermocouples for which there is
no connector with thermo-contacts or for large temperature differences caused
by thermal irradiation) special connectors are available, each with its own inte-
grated temperature sensor (ZA-9400-FSx) for cold junction compensation.
These can be used for all thermocouple types; however, they require 2 mea-
suring channels. Having ´#J´ programmed in the first two positions of the chan-
nel designation for the thermocouple ensures that the temperature sensor inte-
grated in the connector is indeed used for cold junction compensation.
ALMEMO
®
710 45
To Next Page
Loading...
