INTRODUCTION MICRO-TEMP
®
LT, Model 749
OPERATION AND TECHNICAL MANUAL
Page 19 of 75
The circulating water flows over and around the heating element and water temperature sensor
located in the circulating reservoir. The heated water then flows out of the reservoir, to the
circulating pump, through the pump housing and connecting hoses, and then to the localized heat
therapy pad. The water circulates through the pad and returns to the unit to be reheated and
recycled.
In addition, the reservoir contains a low water level sensor which shuts down the heater and pump,
and illuminates the Low Water LED if the water level drops below a preset amount. The unit
becomes operational only after the water level is restored to normal.
1-5.4. TEMPERATURE SAFETY CONTROL SYSTEM
The MICRO-TEMP
®
LT unit is designed to carefully measure and control the temperature of the
circulating water. It is engineered so that when the temperature of the circulating water reaches the
desired set point, the heater cycles in order to maintain the set point temperature.
As a safety precaution, the MICRO-TEMP
®
LT unit has a >1°C (2°F) over set point indicator and a
high temperature indicator.
Each safety device continuously monitors the temperature of the circulating water. As an additional
precaution, if the water temperature sensor itself should fail, the unit shuts down and the display
indicates EE05. With this safety design, both the patient and the unit are protected from injury or
damage caused by extreme temperatures.
NOTE: The operator must regularly monitor the patient whenever localized heat therapy is used.
SAFETY CONTROLS FOR PROTECTION FROM HIGH TEMPERATURE
The circulating water reaches 42.0°C 0.5°C (107°C 1°F), and a microprocessor controls the set
point.
If the circulating water reaches 44°C 0.5°C (111°F 1°F), a safety device shuts off the heater and
pump, the display alternates between flashing the actual water temperature and flashing “HL,” an
audible indicator continuously sounds, and the red “Power Failure/Caution” LED illuminates. This
indicator condition cancels only after the unit is powered down.
If the circulating water reaches >1°C (2°F) over the set point, the display flashes the actual water
temperature, and 2 beeps sound while the red “Power Failure/Caution” LED flashes. The safety
device shuts off the heater. If the water temperature does not return to the set point temperature
after 9 minutes, the device will again sound 2 beeps and the “Power Failure/Caution” LED will flash.
The actual water temperature will continue to flash until the water temperature reaches the set
point.
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