Emerson NGA 2000 TO2 Electrolyte Replacement, Sensor Replacement, Sensor Lleak Check

Model NGA 2000 TO2

Instruction Manual

760008-A September 2001

b.Electrolyte Replacement

Before replacing the electrolyte, be sure to turn off and disconnect all gas connec- tions to the analyzer module. Turn off or disconnect the power to the analyzer module.

7.Refill the Sensor with electrolyte as instructed in Section 4-2b.

8.Reinstall the Sensor Assembly and reconnect J5 and J6 to the power board.

To replace the Sensor electrolyte:

CAUTION.

CAUSTIC LIQUID

Electrolyte is a caustic solution. Re- view the Material Safety Data Sheet in the rear of this manual.

1.Remove the Analyzer Module from its mounting location and place on a sturdy work surface. Be careful not to tilt the module from its horizontal position as the Sensor contains liq- uid that can spill.

2.Remove the cover of the Analyzer Module and locate the 5 mounting screws that hold the Sensor As- sembly onto the Analyzer Module chassis (see Figure 4-1). Remove the 5 screws and retain. Do not lose the screws - they have metric threads.

3.Disconnect the Sensor signal con- nector (J5) and the Flow Sensor connector (J6) from the power board.

4.Remove the complete Sensor As- sembly from the Analyzer Module.

5.Remove the black sensor cover and invert the Sensor Assembly over a suitable receptacle.

6.Flush the Sensor twice with deion- ized water. Dispose of the dis- carded electrolyte and rinse water in accordance with National, Federal, State and Local regulations.

c.Sensor Replacement

If the Sensor cannot be regenerated by the addition of water or the replacement of electrolyte, or if the Sensor shows signs of leakage, it may be necessary to replace the Sensor. Obtain a replacement sensor from the factory. Prior to installa- tion of a new Sensor, perform the leak check described in Section 4-2d.

To replace the Sensor:

1.Remove the Sensor Assembly and remove the electrolyte as described in Section 4-2b.

2.Reinstall the black sensor cover to catch any residual electrolyte.

3.Invert the Sensor Assembly and lo- cate the four (4) mounting screws which hold the Sensor to the Sensor Assembly mounting plate. Remove and retain the four screws.

4.Install replacement Sensor in re- verse order.

5.Check Sensor for leaks and add electrolyte as described in Section 3-5d.

6.Reinstall Sensor Assembly in Ana- lyzer Module and reconnect J5 and J6 to the power board.

After installation of new Sensor, it will be necessary to load new linearization data as described in Section 4-3.

d.Sensor Lleak Check

Before adding electrolyte to the Sensor, it is recommended to check the Sensor for

Rosemount Analytical Inc. A Division of Emerson Process Management Maintenance and Service 4-3