Electro-Chemical Devices (ECD) SMS22 - Manual (Page 32)

signs of leakage or degradation of the material on a monthly basis. The Drain tube should be examined
for leakage when the flow cell is full or slow drainage after the solenoid has actuated, the tubing is
adhering to itself and not releasing the flow. Replace the Drain tubing if either condition exists.
Depending on the chemical make-up of the sample stream this tubing could require replacement every
two to three months.
The solenoid Drain Valve is a knife blade style shut off valve that is constantly pressing against the tubing
to provide a seal. When the solenoid is actuated it releases the pressure on the tube allowing the liquid
in the flow cell to drain. The valve can be released manually by pressing the black circulator portion on
the valve. The valve is supplied with a BLOCK that should be inserted into the gate whenever the
analyzer is not in use. This relieves the pressure on the tubing extending its service life. The tubing may
fuse together and not reopen if left in a compressed position for extended periods of time, weeks to
months.
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