thermocouple reference junction

hi Anyone

i have thermocouple type K in my office, i try to read the value using AI 6ES7531-7KF00-0AB0, after selected what i need in device configuration i found reference junction, and i choose internal reference junction type, when i watch the value in watch & force table the value not same with my measurement device, how to fix that error or deviation?

my measurement device read 27 C but in watch table the value 316 (31.6 C) using thermocouple device.

Thank You :)
Fernando

thermocouple may be not so precisely as a PT100 i.e..
It depends from Quality of your thermocouple, what is the class for it?

Also make sure, that you do not use an unsuitable extention cable when using internal reference.

IBN-Service

thermocouple may be not so precisely as a PT100 i.e..
It depends from Quality of your thermocouple, what is the class for it?

Also make sure, that you do not use an unsuitable extention cable when using internal reference.

 thanks for the info, but i have make the thermocouple value exact with my measurement device, any ide for that?

IBN-Service

You can use an offset value.

 how to set the offset value, can you give me instruction for that? 

thanks IBN-Service