Enflow Fluid Warming System Temperature Control And Alarms - GE Vital Signs enFlow Service Manual

Instructions for changing the Controller/AC Power Pack or AC Power Pack fuse.
1. Insert a screwdriver on either side of the fuse box and push gently to pop the fuse case out of its socket.
2. Pull the broken fuse out of the case.
3. Replace the fuse with (Bussmann #GDB 5A or equivalent). When reinserting the fuse case into the socket
on the Controller, it is keyed so that it can only be inserted in the correct orientation. Push the case in
gently, but firmly, until it snaps into place. At this point, it will be flush with the surrounding surface.

enFlow Fluid Warming System Temperature Control and Alarms

Temperature Control
The enFlow IV Fluid/Blood Warming System includes multiple safety features to prevent over-heating of
infusion fluids. There are built in redundancies and back-up safety systems as means for protection in the
event of a failure in the primary control mechanism. Several aspects of the system work together to
accomplish desired and appropriate safety:
1. Closed-loop temperature control software
2. Audible and visual alarms
3. Software system monitor
4. Independent heater temperature monitoring circuit
Audible / Visual Alarms
The enFlow Warmer incorporates an audible/visual alarm system. This system monitors the fluid
temperature for an over-temperature condition and system faults. The alarm function is tested each time a
Cartridge is inserted. The audible alarm is briefly sounded, and the red light emitting diode indicator is also
briefly illuminated. If a dangerous condition occurs, a continuous audible and visual alarm is activated.
When used with the Model 121 Controller, the audible alarm will come from the Controller, and the display
will identify the alarm condition. When the Warmer is used with Model 120 power supply, the temperature
LED will flash and the audible alarm will come from the Warmer. Over-temperature conditions are
calculated according to ASTM Standard F2172-02 (an FDA Recognized Standard for fluid warmers). This
standard allows for spikes in the fluid temperature without activating an alarm. The alarm has a linear time-
temperature relationship, therefore, the hotter the fluid the less time it will take for the alarm to be activated.
At 45 ºC the alarm will sound after about 20 seconds while at 50 ºC it will be essentially instantaneous. The
alarm will be activated by either the Warmer over-heating the fluid or if the fluid entering the Warmer is too
hot. The audible aspect of the alarm can be muted for 1 minute by pressing any key on the Controller. The
alarm can also be ended completely by sliding open the covers on the Warmer. (For further information,
please reference test for Over-temperature Alarm located in Appendix F: Preventive Maintenance Procedure.
enFlow Service Manual Rev. F 04/12
4400_0060
Fuses
Fusecase
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