Calibrating and Correcting Errors on a Floboss 503


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i have Flowboss 503 installed for natural gas measurements. while calibrating it using roclink software, there are 3 columns displayed:

1. dead weight/tester value
2. live reading
3. Error

Now my query is- Suppose i am calibrating for Temperature and apply a certain value such as "0" degree C using resistance box for zero calibration and entered the same value in dead weight/tester value columns. but live reading is showing 10 degree C after being stabilized and error field also shown accordingly.

how will i correct the error? can simply clicking on "set zero" will eliminate the error?