ASDI Operations and Maintenance – TX Models – P/N: 52368
5-24
CONTACTOR
INSPECTION
WARNING
Contactor that powers the heaters produces sparks which may
ignite any flammable vapors in the area when the control box cover
is removed. If the cover must be removed, shut off the power,
remove the cover and check very carefully for fumes, leaks, or any
indication of flammable vapors in the atmosphere or in the control
enclosure.
Do not re-apply power if fumes are present. They may ignite!
CAUTION
Keep a fire extinguisher available in the immediate vicinity before
re-applying power when the control cover is removed.
TORREXX
TM
vaporizer utilizes an electro-mechanical contactor to switch power
to the heating elements. Since contactors wear out in normal operation, it is
prudent industry practice to inspect then on a preventive maintenance basis.
Manufacturers define a cycle life for contactors based upon operations at rated
current. The cycle rate of the contactor in vaporizers varies due to liquid
temperature/pressure, percent loading of the vaporizer, and installation specifics.
Vaporizer testing has demonstrated that cycle rates are greatest at around 50%
of the vaporizer loading and least when vaporizers are energized in a standby
mode.
We recommend the following inspection schedule for contactors:
5000 hours for vaporizers in service
30,000 hours for vaporizers in standby mode
Remove the incoming and outgoing wires and inspect the individual contacts for
signs of excessive heat or wear. If blackening or pitting is present, the contactor
should be replaced.
For vaporizers operating in a combination of service and standby modes, we
are providing a simple formula to help determine when contactors should be
inspected.
Contactor life factor (LF) can be defined as follows:
LF
=
X + Y _
5000 30000
When
X = hours of vaporizer operation mode
Y = hours of vaporizer in standby mode
If LF is 1 or greater, the contactor should be replaced.
This data is to be used only as a guide. It is not “fool-proof” as the environment
your vaporizer operates in and its load may affect the contactor life span.
Summary of Contents for TORREXX TX100
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