Heater Tube Deposit Rating; Visual Method - PAC Alcor JFTOT II Manual

5. HEATER TUBE DEPOSIT RATING

5.1 VISUAL METHOD

5.1.1 Use the Visual Tuberator light box equipped
with a magnifying glass assembly.
1. Make certain all (three) bulbs in the
Tuberator are functioning to assure consis-
tent ratings.
2. Use only persons to rate tubes who can
distinguish colors, i.e. they should not be
color blind.
5.1.2 Snap the upper end of the heater tube into the
clamp of the adapter for the heater tube.
5.1.3 Push the heater tube against the stop of the
adapter for the heater tube.
5.1.4 Slide the adapter with the heater tube over the
guide rod into the Tuberator.
JFTOT II Operation Manual Rev. C
5.1.5 Insert the ASTM Color Standard horizontally
into the back of the Tuberator in the slot
provided.
NOTE - the Color Standard is known to fade upon
exposure to strong light. The life of the Standard
is not known, but a separate standard plate can
be stored in the dark and compared to the Stan-
dard routinely used.
5.1.6 Rotate the adapter and position the heater tube
such that the side with the maximum deposit is
visible. If necessary, remove adapter and
rotate heater tube slightly in holder to better
reveal the maximum deposit.
5.1.7 Compare the maximum heater tube deposit
with the ASTM Color Standard. When the
maximum deposit corresponds exactly to a
color standard, that number should be re-
corded. If the maximum heater tube deposit
being rated is in the obvious transition state
between any two adjacent color standards, the
rating should be reported as less than the
darker (the higher number) standard.
5.1.8 In the event the heater tube has deposits which
do not match the normal Color Standard colors,
then use the following rules for rating. With
reference to standard terms:
1. If the deposit is peacock color, rate this as
"Code P", but also rate any deposit that
shows normal deposit color.
NOTE - Peacock is a multicolored, rainbow-like
deposit color caused by interference phenomena
when deposit thickness exceeds the quarter-
wavelength of visible light.
2. If the deposit contains an abnormal color,
rate this as "Code A", but also rate any
deposit that shows normal deposit color.
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