Calibration And Maintenance; Calibrate - Emerson Rosemount CX1100 Reference Manual

Reference Manual
00809-0100-4110
5

Calibration and maintenance

You can calibrate the Rosemount in the installed condition without removing the
instrument from the process duct and also while the combustion process is online.
Gas is applied to the sensor through the calibration gas fitting. New Rosemount systems
are factory calibrated and are generally acceptable for initial start-up and operation.
To gain high accuracy, calibrate a system during normal operating conditions. Emerson
recommends calibrating on a semi-annual to annual basis for most applications; however
actual calibration frequency may vary per process unit.
Use a two-point calibration. Emerson recommends using 0.4 percent O
gases with a balance of nitrogen, as those are the gases used at the factory. Calibration
gases with other oxygen concentrations are acceptable. If using different calibration gas
values, you must do some additional configuration through the transmitter. Emerson does
not recommend pure nitrogen as a calibration gas. Use a two-stage pressure regulator to
establish a pressure of 20 psig (137.9 kPa) from the bottles and set the flowmeter to 5 scfh
(2.5 L/min) flow rate.
5.1

Calibrate

Intiate probe calibration from the remote transmitter. The transmitter display prompts you
with the calibration instructions.
Procedure
1. Press the x1 or x2 menu button on the transmitter display to enter the probe.
2. Navigate, using Up and Down buttons to Setup; press Enter.
3. Navigate to Cal Gas values; press Enter.
4. Navigate to Cal Gas 1 and press Enter twice to highlight the value setting.
5. Use the Up and Down buttons to set Cal Gas 1 value and Left and Right buttons to
6. After setting the correct value, press Enter and press Left to go to the Calibration
7. After setting the values, press Left to go up to the Calibration submenu.
8. Navigate using the Up and Down buttons to Calibration and press Enter to start.
9. Follow the instructions on the display, manually applying calibration gases to the
10. After the calibration is finished, press Left and use the Up and Down buttons the
After completing the procedure, the software calculates new calibration values and
determines whether they meet an acceptance criteria. If successful, the new calibration
values automatically replace the previous values. In the event the calibration values do not
meet the accepted performance criteria, the existing calibration values remain in effect,
and Emerson recommends replacing the probe.
Reference Manual
move to decimals setting.
Setup for Cal Gas 2, Gas time, and Purge time settings.
0.4 percent O , 8.0 percent O
2
calibration port.
Emerson recommends applying 0.4 percent and 8.0 percent O
check the current and previous ten calibration logs.
, and 300 seconds are the defaults.
2
Calibration and maintenance
May 2023
and 8.0 percent O
2
at 5 SCFH.
2
2
31