Emerson Rosemount 928 Reference Manual page 48

Configuration
February 2023
9. Select OK when the zero measurement reading stabilizes.
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c) Attach a length of calibration tubing (PVC tubing, 3/16-in. ID, 5/16-in. OD)
from the regulator on the cylinder to the fitting on the IP filter assembly (part
number 00628-9000-0001).
d) Release the clean air/known percent oxygen specified calibration gas to the
sensor.
Note
If you need a long length of calibration tubing to reach the device, make
allowances for a delay in response time from the sensor while the clean air
travels the length of the calibration tubing.
e) Complete Step 9 through Step 11.
f) Turn off the clean air (or percent oxygen specified calibration gas) when the
sensor is correctly zeroed.
Note
Negative measurement readings may occur and are normal during zeroing.
Reference Manual
00809-0100-4928
Emerson.com/Rosemount