Chemical Engineering October 2020 - 39

Test point no. 3
" 34 " DB
Test point no. 1
" 34 " DB
Test point no. 2
" 34 " DB
FIGURE 12. In this example, the ultrasound levels
at Test point 3 are equal or less than Test points
1 or 2
Setup and operation
The ultrasound unit needs to be set
at 25 kHz to provide the highest
clarity for high-frequency ultrasound
generated by steam or condensate
passing through an orifice in a
steam trap. The following steps outline
a typical operation procedure:
1. Pull the trigger to turn on the
ultrasound unit. If the instrument is
within sensitivity range, the decibel
(dB) indicator (A in Figure 11)
will blink.
2. The decibel reading should be
set to 20 dB.
3. The kHz (frequency) indicator
must be steady and not blinking (B
in Figure 11). If the kHz is blinking,
then it is in the adjustment mode for
frequency. Adjust it to the correct
frequency level and push in the sensitivity
knob to return to the sensitivity
adjustment-setting mode.
4. Once in the sensitivity mode,
turn the sensitivity control dial
clockwise to increase the sensitivity
and counterclockwise to decrease
the sensitivity.
5. The sensitivity
control
dial
increases
or decreases the sensitivity
of the instrument simultaneously with
the sound level in the headphones
(NOTE: The instrument needs to be
in range for accurate testing).
Temperature
transmitter
Heat exchanger
T4
T2
T3
T1 1. Upstream
2. Downstream
3. Steam trap discharge
orifce
4. Steam trap air vent
FIGURE 13. The four test points shown here are
used for testing float and thermostatic steam traps
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6. If the sensitivity is too low, a
blinking arrow pointing to the right
will appear, and no numeric decibel
level will be visible in the display
panel. If this occurs, increase
the sensitivity until the arrow disappears.
(In low-level sound environments,
the arrow will blink continuously,
and it will not be possible to
achieve a dB indication until a higher
intensity level is sensed.)
7. If the sensitivity is too high, a
blinking arrow pointing to the left
will appear, and no numeric decibel
value will be visible on the display
panel. Reduce the sensitivity until
the arrow disappears and the numeric
decibel value is shown.
Testing methods and results
What follows are a few examples of
some tests for comparison.
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Chemical Engineering October 2020

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