Teledyne 356WA - page 17

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Teledyne Analytical Instruments

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.

4.2.34.2.3

4.2.3 Cell InstallationCell Installation

Cell InstallationCell Installation

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 NOTDO NOT

DO NOTDO NOT

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.