Icon Definitions - Walchem WDP420 Instruction Manual

Wph series, wdp series, ph & orp controllers

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Instruction manual (20 pages)

Table Of Contents

Table of Contents

For submersion applications, mount the electrode below the minimum solution level. If the tank will be

completely emptied, plan on removing the electrode and storing it in tap water (NOT DI water) or pH 4

buffer solution while the tank is empty. If this is not desirable, a recirculation loop may be installed

with the electrode mounted in-line. The WEL electrode cable is not waterproof and must be protected

from moisture by connecting a pipe to the top of the electrode housing. The opposite end of the pipe

should also be protected from moisture using a cable gland. When submerging the electrode, make sure

the cable is protected by a length of pipe, sealed at the top using a cable gland.

For in-line applications, where the electrode is installed in a pipe, the electrode should be placed on the

discharge side of the pump (under positive pressure). A "U" trap should be included so that if flow

stops, the electrode is still immersed in the solution. If the flow through the pipe can not be shut down

for cleaning and calibrating the electrode, install the electrode in a by-pass line with isolation valves to

allow for electrode removal. The electrode should be installed in an area where there is good solution

movement and where it will respond rapidly to chemical additions. The placement of the electrode

relative to the placement of chemical replenishment, along with the quality of the mixing and

replenishment flow rate, is critical to accurate control.

IMPORTANT: To avoid cracking the female pipe threads on the supplied plumbing parts, use no more

than 3 wraps of Teflon tape and thread in the pipe FINGER tight plus 1/2 turn! Do not use pipe dope to

seal the threads of the flow switch because the clear plastic will crack!

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