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www.rangerfluidwarming.com reorder #202524A

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Model 245

3MTM RangerTM Blood/Fluid and Irrigation Warming Systems

Testing the Over-temperature Alert Points (43°C [±1] and 46°C [+3, -2])The over-temperature alert test causes the Ranger warming unit to go into an over-temperature test mode by manually overriding the primary control system and engaging the heaters. The Ranger warming system is very responsive to heater input; therefore the test procedures are technique sensitive. Read instructions thoroughly before beginning these tests.

The first alert point at 43°C (±1) notifies user to the rise in temperature (see step 7). At the

46°C (+3, -2) secondary alert set point, the unit cuts power to the heaters (see step 8). Please note that due to the heaters’ rapid response, you may see temperature readings drift within the range of 44- 49°C.

7.Loosen the over-temperature screw on the bottom of the Ranger warming unit (see Fig. 3). Listen for a slight click as the microswitch opens. Loosen 1/2 turn more. This unit is now in over-temperature test mode, and the temperature output of the unit should begin to rise. When the Ranger display reads 43°C, verify that an audible alert sounds, the alert light illuminates, and the display alternately flashes “HI” and the plate temperature.

Over-temperature

screw

Fig. 3: Ranger warming unit over-temperature screw

8.Listen for the power relay to click at 46°C (+3, -2) (you can feel the click when holding the lower left corner of the unit as you face the front display). The click signifies the secondary alert trip point and signals that power to the heaters has been shut off. The over-temperature alert sounds, the alarm light illuminates, and the alphanumeric display alternately reads “HI” and the plate temperature. Watch the thermocouple temperature monitor to determine the unit’s peak temperature output (less than 1 minute). The temperature reading on the monitor should peak at 46°C (+3, -2).

note: If the temperature displayed on the thermocouple monitor exceeds 49°C during the test, tighten the over-temperature test screw on the bottom of the Ranger warming unit, unplug it, and run cold fluids through the cassette. This returns the unit to normal operating temperature. Call 3M Patient Warming technical support.

9.The secondary alert is designed to latch. Verify this feature by momentarily turning off the power switch, then turning it on again. The Ranger warming unit should continue alerting throughout this sequence.

10.Securely tighten the over-temperature screw, turn off the Ranger warming unit, and unplug the unit. Once power is cut to the Ranger warming unit, the alert will cease. The unit is ready to return to service after it cools to normal operating temperature (approximately 20-30 minutes).

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