3M Ranger 247 - Model 247 Over-Temperature Testing; Testing Model 247 Alarm Points

English
15
247021E English
Ranger Blood and Fluid Warming Systems
testing the oveR-temPeRatuRe alaRm Points (48°C [±2] and 50°C [±2])
e over-temperature alarm test causes the Ranger irrigation unit to go into an over-temperature
test mode by manually overriding the primary control system and engaging the heaters� e Ranger
irrigation system is very responsive to heater input; therefore the test procedures are technique
sensitive� Read instructions thoroughly before beginning these tests�
e rst alarm point at 48°C (±2) alerts user to the rise in temperature (see step 7)� At the
50°C (±2) secondary alarm 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
Ranger display reads 48°C, verify that
an audible alarm sounds, the alarm
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 signies the secondary alarm
trip point and signals that power to the heaters has been shut o� e over-temperature alarm
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)� 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 unit, unplug it,
and run cold uids through the warming cassette� is returns the unit to normal operating
temperature� Call Arizant Healthcare Inc� Technical Support�
9� e secondary alarm is designed to latch� Verify this feature by momentarily turning o the
power switch, then turning it on again� e Ranger irrigation unit should continue alarming
throughout this sequence�
10� Securely tighten the over-temperature screw, turn o the Ranger irrigation unit, and unplug the
unit� Once power is cut to the Ranger irrigation unit, the alarm will cease� e unit is ready to
return to service aer it cools to normal operating temperature (approximately 20-30 minutes)�
Fig. 3: Ranger irrigation over-temperature screw
Over-temperature
screw
Model 247