Emerson NGA2000 TO2 instruction manual Water Addition To add water, Fuses, Electrolyte Replacement

Instruction Manual

748374-F March 2003

Model NGA2000 TO2

a.Water Addition To add water:

1.Remove the top cover of the analyzer module.

2.Unscrew the black sensor cover.

3.Slide the cover back just enough to al- low the neck of the fill bottle to fit into the sensor reservoir.

4.Add distilled or deionized water using the fill bottle provided with the analyzer module. Fill to approximately midway between the min and max level indica- tors on the sensor label. Be careful not to spill water, splash electrolyte or over- fill sensor.

5.Replace the sensor cover securely.

6.Replace the top cover of the analyzer module.

If the electrolyte alarm is activated but the sensor shows sufficient electrolyte, the elec- trolyte may have been contaminated by substances present in the sample which are chemically incompatible with the sensor or electrolyte. If this should occur, the electro- lyte must be drained and replaced with fresh electrolyte.

Refer to Section 4-3 below for the proper procedure for replacing electrolyte.

Several other components may require re- placement. These are discussed in the fol- lowing sections.

4-2 FUSES

Remove power to the Analyzer Module prior to fuse replacement. To replace the Power Fuse, locate the fuse cover on the front panel of the Analyzer Module, as shown partially in Figure

2-3 on page 2-4. Push and turn the fuseholder cover 1/4 turn counterclockwise. Remove and replace the fuse as required. There are no other fuses in the Analyzer Module.

4-3 ELECTROLYTE REPLACEMENT

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

To replace the Sensor electrolyte, 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 liquid that can spill. Re- move the cover of the Analyzer Module and lo- cate the 5 mounting screws that hold the Sensor Assembly onto the Analyzer Module chassis (see Figure 4-1 on page 4-1). Remove the 5 screws and retain. Do not lose the screws - they have metric threads.

Disconnect the Sensor signal connector (J5) and the Flow Sensor connector (J6) from the power board. Remove the complete Sensor Assembly from the Analyzer Module. Remove the black sensor cover and invert the Sensor Assembly over a suitable receptacle. Flush the Sensor twice with deionized water. Dispose of the discarded electrolyte and rinse water in ac- cordance with National, Federal, State and Lo- cal regulations. (See MSDS in the rear of this manual.)

Refill the Sensor with electrolyte as instructed in Section 2-2a on page 2-1. Reinstall the Sensor Assembly and reconnect J5 and J6 to the power board.

4-4 SENSOR REPLACEMENT

If the Sensor cannot be regenerated by the ad- dition of water or the replacement of electrolyte, or if the Sensor shows signs of leakage, it may be necessary to replace the Sensor. To replace the Sensor, remove the Sensor Assembly and remove the electrolyte as described in Section

4-3 above. Reinstall the black sensor cover to catch any residual electrolyte. Invert the Sensor Assembly and locate the four (4) mounting screws which hold the Sensor to the Sensor As- sembly mounting plate. Remove and retain the four screws.

4-2 Maintenance and Troubleshooting Rosemount Analytical Inc. A Division of Emerson Process Management