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202524A
3M
TM
Ranger
TM
Blood/Fluid and Irrigation Warming Systems
Check the 3M
TM
Ranger
TM
system website to ensure you have the most recent version of this document. www.rangerfluidwarming.com reorder #202524ACheck the 3M
TM
Ranger
TM
system website to ensure you have the most recent version of this document. www.rangerfluidwarming.com reorder #202524A
teSting the oveR-tempeRAtURe AleRt pointS (48°C [±2] And 50°C [±2])
e 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. e Ranger
irrigation warming system is very responsive to heater input; therefore the test procedures are technique
sensitive. Read instructions thoroughly before beginning these tests.
e rst alert point at 48°C (±2) noties 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 ½ turn more. is
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 ashes “HI” and
the plate temperature.
8. Listen for the power relay to click at 50°C (±2) (you can feel the click when holding the lower le
corner of the unit as you face the front display). e click signies the secondary alert trip point and
signals that power to the heaters has been shut o. e 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). e 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 uids through the cassette. is returns the unit to normal operating temperature. Call 3M
Patient Warming technical support.
9. e secondary alert is designed to latch. Verify this feature by momentarily turning o the power
switch, then turning it on again. e Ranger irrigation warming unit should continue alerting
throughout this sequence.
10. Securely tighten the over-temperature screw, turn o the Ranger irrigation warming unit, and
unplug the unit. Once power is cut to the Ranger irrigation warming unit, the alert will cease. e
unit is ready to return to service aer it cools to normal operating temperature (approximately 20-30
minutes).
Fig. 3: Ranger irrigation uid warming unit over-temperature screw
Over-temperature
screw
Model 247