Cincinnati Sub-Zero HEMOTHERM 400CE, Руководство по эксплуатации, Страница: 69 / 95

OPERATION MANUAL HEMOTHERM MODEL 400CE
Page 22 of 46
When in cool mode, the low wattage heater will pre-warm the water to the desired
temperature set point for that reservoir. While in the heat mode, the water is heated with
both high and low wattage elements. It is important to remember that there is no direct
relationship between the temperature in the reservoirs and the rate of change in the blood
temperature.
An over temperature limit (OTL) alarm automatically monitors the actual heat side
reservoir temperature and compares it to the heat side set point. If the actual display
temperature increases above the set point by 1°C or more for longer than two (2) minutes
the high temperature limit LED on the front panel will flash and the alarm will sound a
short beep. Once the temperatures are within 1°C the alarm will clear.
If the controller should happen to fail at the 42°C set point, the HIGH TEMP. LIMIT light
on the key pad will illuminate and the alarm will sound at 44°C. The primary high
temperature safety is designed to automatically shut off the heaters at 44°C. The heating
system will come back on after approximately a 1°C temperature drop below the heat set
point.
This is a redundant system in that there is a secondary high temperature safety preset at
46°C. If the primary high temperature safety should happen to fail at 44°C, the HIGH
TEMP. LIMIT light on the key pad will illuminate and alarm will sound at 46°C and the
heaters will turn off automatically. If this should occur, the system should be inspected by
the hospital's maintenance or engineering department. This is a Remove from Service
(RFS) alarm.
1.7 WATER CIRCULATION SYSTEM
The HEMOTHERM 400CE circulation system consists of:
1. Two water reservoirs
Cool Reservoir - (8 qts. - 7.6 liters)
Heat Reservoir - (6 qts. - 5.7 liters)
2. One recirculation pump
3. Four water flow control solenoid valves
4. One water filter
5. Six quick-connect fittings
6. Interconnecting water piping
Selection of the heat or cool mode determines which water flow circuit is used.
HEAT MODE: Pump draws water from the heat reservoir and circulates it through
the water filter to the quick-connect fittings connected to the device in use (blood
oxygenator/heat exchanger and/or blanket). Returning water flows back into the
same heat reservoir. The circulation system operates with distilled water only.
COOL MODE: Pump draws water from the cool reservoir and circulates it through
the water filter to the quick-connect fittings connected to the external device(s).
Returning water flows back into the same cool reservoir.