Check the 3MTM RangerTM system website to ensure you have the most recent version of this document. | www.rangerfluidwarming.com reorder #202524A |
3MTM RangerTM Blood/Fluid and Irrigation Warming Systems | English |
| |
Testing the Over-temperature Alert Points (48°C [±2] and 50°C [±2])
The over-temperature alert test causes the Ranger irrigation warming unit to go into an over-temperature test mode by manually overriding the primary control system and engaging the heaters. The Ranger irrigation 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 48°C (±2) notifies user to the rise in temperature (see step 7). At the 50°C (±2) secondary alert set point, the unit cuts power to the heaters (see step 8).
7.Loosen the over-temperature screw on the bottom of the Ranger irrigation 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 display reads 48°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 irrigation fluid warming unit over-temperature screw
8.Listen for the power relay to click at 50°C (±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 alert 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 50°C (±2).
note: If the temperature displayed on the thermocouple monitor exceeds 52°C during the test, tighten the over-temperature test screw on the bottom of the Ranger irrigation 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 irrigation warming unit should continue alerting throughout this sequence.
10.Securely tighten the over-temperature screw, turn off the Ranger irrigation warming unit, and unplug the unit. Once power is cut to the Ranger irrigation 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).
