Operation / Technical Manual
NORM-O-TEMP
®
, Model 111W
Page 25 of 82
In addition, the circulating reservoir contains a low water level sensor which shuts
down the unit and sounds an alarm if the water level drops below 1 ½ quarts (1.4
liters). The unit becomes operational after the water level is restored to normal.
1-5.3.
Temperature Safety Control System
The NORM-O-TEMP
®
unit is designed to carefully measure and control the
temperature of the circulating water by heating. The unit is engineered so that when
the temperature of the circulating water reaches the desired set point, the heater
cycles on and off to maintain that set point temperature. The unit is designed to stay
within 0.6
°
C of the selected temperature.
The microprocessor board continuously monitors the temperature of the circulating
water and each unit is protected by an independent high limit safety. As an additional
precaution, if the water temperature sensor itself should fail, the unit shuts down, the
alarm sounds, and the display will read ERR (for error). With this safety design, the
patient is protected from injury and the unit from damage caused by extreme high
temperatures.
Safety Controls for Protection from High Temperature
If the circulating water reaches 43.5°C
0.6°C, the primary high temperature safety
will activate to turn off pump, turn off heater, the HI TEMP LED flashes and the
trouble alarm sounds.
If the circulating water reaches 44.5°C ± 0.6°C, the secondary high temperature safety
will activate to turn off pump, turn off heater, the HI TEMP LED illuminates and the
trouble alarm sounds.
If the circulating water reaches 46°C
0.6°C, the independent mechanical high
temperature safety will activate to shut off the power to the pump, shut off the power
to the heater, the HI TEMP LED and Power Fail LED illuminate, and the trouble alarm
sounds.
CAUTION
The operator must regularly monitor the patient whenever hyperthermia or
normothermia therapy is used.
