EBME Forums Forums Maintenance Service Manuals & Schematics Respical T300 gasflow analyzer, who is still using

I am at the pressure sensor voltage output interface,Use a separate power supply to connect the voltage.
View the pressure value on the screen and record the corresponding voltage value
But why the pressure value can only reach 85.07cmh20and 85.44psi?
According to the manual, it should be +120cmh2o and 100psid