Ranger Fluid Warming Systems
English
Testing the Over-temperature Alarm Points (48° and 50°C)
The 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. The Ranger Irrigation system
is very responsive to heater input; therefore the test procedures are technique sensitive. Read instructions
thoroughly before beginning these tests.
The first alarm point at 48°C alerts user to the rise in temperature (see step 3). At the 50°C secondary
alarm set point, the unit cuts power to the heaters (see step 4).
1. Perform Test Setup.
2. Turn the Ranger Irrigation unit ON and allow it to stabilize at normal operating temperature (41°C±1)
for 5 minutes.
3. Slowly loosen the over-temperature screw on the bottom of the Ranger Irrigation unit (see Figure 3).
Listen for a slight click as the microswitch opens.
Stop turning the over-temperature screw as soon as
you hear the click.
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 alarm sounds, the alarm
light illuminates, and the display alternately flashes “HI” and the plate temperature.
4. Listen for the power relay to click between 49-52°C (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 alarm trip point and
signals that power to the heaters has been shut off. The 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). The temperature reading on the monitor should peak between 49-51°C.
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
fluids through the warming cassette. This returns the unit to normal operating temperature. Call
Arizant Healthcare Inc. Technical Support.
5. The secondary alarm is designed to latch. Verify this feature by momentarily turning off the power
switch, then turning it on again. The Ranger Irrigation unit should continue alarming throughout this
sequence.
6. Securely tighten the over-temperature screw, turn off the Ranger Irrigation unit, and unplug the unit.
Once power is cut to the Ranger Irrigation unit, the alarm 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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Fig. 3: Ranger Irrigation over-temperature screw
Over-temperature screw
