Teledyne 356WA instruction manual Cell Installation

Trace Oxygen Analyzer Operations 4

Sufficient electrolyte is provided for initial servicing of the cell. Elec- trolyte for future service should be ordered from Teledyne. When ordering, specify type and quantity.

4.2.3 Cell Installation

Prior to servicing and installing the cell, inspect the lead electrode in the acrylic base for signs of oxidation, indicated by a reddish-brown or yellow discoloration. If discoloration is noted, clean the cell as directed in section 5.5.2 before placing it in service.

WARNING: Type A electrolyte is caustic. Use extreme care in handling. Protective equipment including but not limited to gloves and safety glasses should be worn while handling electrolyte. Refer to the Material Safety Data Sheet in the Appendix regarding potential hazards and corrective action in case of accident.

1)Remove the four cell mounting bolts which secure the plastic cover. Pour out the distilled water.

2)Pour about half the furnished electrolyte into the cell and slosh until all components within the cell are wetted by the solution. Drain and dispose of the solution.

3)Wipe the top of the cell and the O-ring with a clean, disposable tissue to remove solution from the exterior. DO NOT touch the interior of the cell.

4)Carefully pour in electrolyte until it just touches the bottom edge of the silver screen assembly at all points. This is indicated by a definite wicking of electrolyte onto the screen assembly at every point along ithe bottom edge. It is essential at this point that the bottom edge of the screen assembly be wetted at all points (as seen by the wicking action), but not over-immersed (as large a surface area as possible of the screen assembly must remain above the electrolyte, while every point of the bottom edge must be wetted). The level is correct when the bottom edge of the sensor screen is wetted but not immersed; approximately 3/32 "of the silver electrode extends into the pool of eelectrolyte.

NOTE: The electrolyte level in the cell is critically related to its sensitivity due to the change in the cathode surface area exposed to the eledctrolyte.

5)Carefully place the cell under the cell mounting plate with the outer terminal toward the front. Secure in place with four bolts supplied with the cell. Refer to Figure 4-2.

Teledyne Analytical Instruments 4-3