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B-26 SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
B.15 Sensor Unit
The sensor unit (SNSU) monitors the intake-air temperature and humidity. In the M9000, this
unit is mounted only on a base cabinet. When the output value of the sensor exceeds the
reference value, XSCF issues an alarm to the system.
FIGURE B-18 shows the SNSU.
FIGURE B-18 Sensor Unit (SNSU)
SNSU has the following characteristics.
■ Only cold replacement is available for the SNSU.
■ Only the temperature sensor and the humidity sensor are mounted.
■ Data processing such as A/D conversion is performed with the operator panel (OPNL).
■ The SNSU has a label bearing the printed component number and manufacture's serial
number.