5
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!
3.4 Icon
Definitions
Symbol Publication Description
IEC 417, No.5019
Protective Conductor Terminal
IEC 417, No. 5007
On (Supply)
IEC 417, No. 5008
Off (Supply)
ISO 3864, No. B.3.6
Caution, risk of electric shock
ISO 3864, No. B.3.1
Caution
