![Ahlborn ALMEMO 2690-8 Скачать руководство пользователя страница 27](http://html1.mh-extra.com/html/ahlborn/almemo-2690-8/almemo-2690-8_operating-instructions-manual_2870442027.webp)
Correction of the Meas. Value and Compensation
9.2.7 Cold Junction Compensation
Cold junction compensation for thermocouples is normally performed automati-
cally by means of an NTC sensor in measuring socket M2. The Cold junction
temperature is displayed as an operating parameter in the device configuration
(s. 10.5.8) It can be incorporated if necessary in measured data acquisition as
a device temperature with function channel "CJ" (s. 10.3.10) Instead of this
form of cold junction temperature measurement it is also possible to use an
external measuring sensor (Pt100 or NTC) in an isothermal block (see Manual,
section 6.7.3); this must be positioned upstream from the thermocouples and
"*J" must have been programmed in the first two positions in the comments (s.
10.3.2).
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) there are special connectors available for cold junction
compensation each with its own integrated temperature sensor (ZA-9400-FSx).
These can be used for all thermocouple types; however, they require two mea-
suring channels. Having "#J" programmed in the first two positions in the com-
ments for the thermocouple ensures that the temperature sensor integrated in
the connector is indeed used for cold junction compensation.
ALMEMO
®
2690-8
27