Dynatron® 850plus & 550plus
Ultrasound Technical Information
109
Problem Solving
Soundhead Temperature Too Hot
If poor coupling occurs during a treatment, the temperature of the soundhead rises and the
patient does not receive the full ultrasonic output. This device continuously measures the
temperature of the soundhead to ensure both that the patient is receiving the optimal
treatment and that the soundhead crystal is protected from overheating.
If the soundhead temperature approaches the maximum level, the POWER display will
begin flashing.
For devices having software Rev. prior to 1.02:
If the temperature reaches the maximum level allowed, the treatment is
automatically PAUSED, the output power is stopped, the treatment time stops
counting down, both the Time and Power displays flash continuously. The
soundhead must then be cooled down before the treatment can resume.
For devices having software greater than Rev. 1.01:
With software revisions greater than Rev. 1.01, the Time and Power displays do not
flash, but the Time display shows the error message “HOT” (see Page 2 of this
manual for instructions on determining the revision level of your device). When this
condition occurs, the treatment timer is paused, output is stopped, and the soundhead
must be cooled down before the treatment can resume. Once the soundhead is
cooled, press Pause or Start to resume the treatment.
See "Ultrasound Instructions" in this manual for more information regarding warnings for a
hot soundhead, and the new soundhead temperature graph (available for software revisiong
1.02, 1.03, or later), as well as more complete information for cooling the soundhead before
resuming treatment.
Cooling the Soundhead
The temperature alert not only ensures good coupling throughout the treatment, it helps avoid
damage to the soundhead crystal. If the soundhead becomes too hot, it must be allowed to
cool down before resuming the treatment. The head will cool slowly if allowed to sit at room
temperature. To cool the soundhead quickly, you can place it in room temperature water.
Sometimes just applying more conductive gel will adequately cool the head. Larger
soundheads will take longer to cool down. DO NOT USE ICE to cool the soundhead as
this can cause thermal shock to the crystal and may necessitate a costly repair. Damage
caused by thermal shock is not covered under the warranty.
Whirlpool Treatments
If you are treating in a whirlpool, you may find the temperature reaches a high enough
temperature to cause the display to flash (115˚). This is a warning only to let you know you
are approaching the temperature limit. You may, however, continue with the treatment at this
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