Arena Service Manual
The following tests are therefore performed during Self Test to
guarantee a fully functional system.
1. Primary probe temperature measurement accuracy test
The SBC compares the I/O Controller's primary probe
measurement with the UF-Proportioning Controller's
measurement of the “B” probe’s temperature reading and
verifies that they are within 1°C of each other. In addition, the
primary dialysate temperature is continuously displayed on the
front panel, allowing user verification of its accuracy.
2. I/O temperature alarm test
The SBC consecutively generates both primary temperature
alarms by first setting the upper alarm limit to a value below
the current temperature, and then by setting the lower alarm
limit to a value above the current temperature. An upper alarm
is also generated through hardware by shunting the primary
probe thermistor with a resistance. In each case, a reported
alarm condition from the I/O Controller board is verified by the
SBC.
3. UF/Prop temperature alarm test
The backup high temperature alarm in the UF-Proportioning
Controller is tested by moving the alarm limit so that it forces
an alarm condition. The alarm response is then verified.
6.5 INTERNAL CABINET TEMPERATURE CONTROL
The purpose of the cabinet cooling system is to keep the internal
temperature of the cabinet lower than 50°C. Most electronic
components are rated to operate at 60°C (local ambient). An
internal fan, with an externally accessible dust filter, located at the
base of the Instrument (see Section 2) draws in ambient room
temperature air to cool the electronics of the Instrument.
6-8 157-1278-913 Rev A
November 2003
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