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360093-1/H
Platelet Incubator Operation Manual
4
Test the high temperature alarm.
a
Using the water for the high alarm test, fill the tube for alarm checks to a depth of at least 3 inches
(8 cm). After returning the tube to its holding bracket, slide the tube upward to immerse the tip of
the temperature control probe.
b
Watch the chamber temperature reading on the temperature controller. The temperature should
increase slowly (at a rate of about 0.5 °C per minute). When the temperature reaches the high
alarm setpoint, and the alarm delay period elapses, an alarm should sound and -AL- and the red
alarm light should flash.
5
Dispose of the water and return the tube to the bracket. Slide the tube so that it is below the probe.
!
CAUTION:
Leaving the probe covered during normal operation prevents the probe from
accurately reading the chamber temperature.
7.8.1.2
Testing temperature alarms on Horizon Series models other than PC100h
You must have the following to complete this procedure:
►
A container for holding the water to be used during the tests. The container should be deep enough
to keep the tip of the probe immersed in water. The volume of the container should be large enough
to accommodate additional water that is used to raise or lower the temperature. The opening in the
container should be at least 3.25 inches (8 cm) wide to accommodate the probe bracket (for more
information, see steps 5-6 in the procedure that follows).
►
Room-temperature water. The water should be at least 1 °C higher than the low alarm setpoint, and
at least 1 °C lower than the high alarm setpoint. There should be enough to fill the test container to a
depth of about 1 inch (2 cm).
►
Crushed ice or chilled water to be used for the low alarm test. The ice or chilled water will be added to
the test container to slowly lower the temperature of the water.
►
Hot water to be used for the high alarm test. After the low alarm test has been completed, the hot water
will be added to the test container to slowly raise the temperature of the water.
To test the temperature alarms
!
CAUTION:
Temperature probes are fragile. Handle them with care.
1
Verify that the temperature controller readout has been calibrated. For calibration instructions, see
Section 7.6, “Calibrating the temperature controller readout.”
2
Identify the current settings for the low alarm setpoint and high alarm setpoint. For instructions, see
Section 5.1, “Viewing and changing the setpoints for temperature alarms.”
3
Prepare the container for testing. Using the room-temperature water, fill the container to a depth of
at least 1 inch (2 cm). Also prepare a separate container with the crushed ice or chilled water, and a
separate container with the hot water.
4
Remove the probe bracket from the chamber. Loosen the screws for the probe bracket, then slide the
bracket upward. If an agitator is installed, you may need to move it to access the bracket.
