Preventive Maintenance - Magnetrol AMETEK T62 Installation And Operating Manual

PREVENTIVE MAINTENANCE

Periodic inspections are a necessary means to keep your level control in good working order. This control is a safety device to
protect the valuable equipment it serves. A systematic program of "preventive maintenance" must be implemented when the
control is placed into service. If the following sections on "What to do" and "What to avoid" are observed, your control will pro-
vide reliable protection of your equipment for many years.
What to do
1. Keep control clean
Be sure the switch housing cover is always in place on
the control. This cover is designed to keep dust and dirt
from interfering with switch mechanism operation. In
addition, it protects against damaging moisture and acts
as a safety feature by keeping bare wires and terminals
from being exposed. Should the housing cover become
damaged or misplaced, order a replacement immediate-
ly.
2. Inspect switch mechanisms, terminals and connec-
tions regularly
Dry contact switches should be inspected for excessive
wear on actuating lever or misalignment of adjusting
screw at point of contact between screw and lever. Such
wear can cause false switch actuating levels. Adjust
switch mechanism to compensate (if possible) or
replace switch.
Do NOT operate your control with defective or malad-
justed switch mechanisms (refer to bulletin on switch
mechanism furnished for service instructions).
. Magnetrol controls may sometimes be exposed to
excessive heat or moisture. Under such conditions,
insulation on electrical wires may become brittle, even-
tually breaking or peeling away. The resulting "bare"
wires can cause short circuits.
NOTE: Check wiring carefully and replace at the first
sign of brittle insulation.
Vibration may sometimes cause terminal screws to
loosen. Check all terminal connections to be certain that
screws are tight.
On units with pneumatic switches, air (or gas) lines sub-
jected to vibration, may eventually crack or become loose
at connections causing leakage. Check lines and connec-
tions carefully and repair or replace, if necessary.
NOTE: Spare switches should be kept on hand at all
.
times.
3. Inspect entire unit periodically
Isolate control from vessel. Raise and lower liquid level
to check for switch contact and reset.
6
What to avoid
1. NEVER leave switch housing cover of the control longer
than necessary to make routine inspections.
2. NEVER use lubricants on pivots of switch mechanisms.
A sufficient amount of lubricant has been applied at the
factory to insure a lifetime of service. Further oiling is
unnecessary and will only tend to attract dust and dirt
which can interfere with mechanism operation.
3. NEVER attempt to make adjustments or replace switch-
es without reading instructions carefully. Certain adjust-
ments provided for in Magnetrol controls should not be
attempted in the field. When in doubt, consult the facto-
ry or your local Magnetrol representative.
4. NEVER place a jumper wire across terminals to "cut-out"
the control. If a "jumper" is necessary for test purposes,
be certain it is removed before placing control into ser-
vice.