Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 94)

Model 9110T NOx Analyzer Overview of Operating Modes
Teledyne Analytical Instruments 94
I MPORTANT I MPACT ON R EADINGS OR D ATA
Any changes made to a variable during the SETUP procedures are not
acknowledged by the instrument until the ENTR button is pressed. If the
EXIT button is pressed before the ENTR button, the analyzer will make an
audible signal before exiting the menu, alerting the user that the newly
entered value had not been accepted.