Section 2 – SR-2 Hardware Description
CARGOWATCH SENSORS
The CargoWatch Data Logger is internal to the HMI
Control Panel. This Data Logger conforms to
European standard EN12830. The Data Logger
supports up to 6 temperature sensors and 4 digital
inputs.
The sensors used for the CargoWatch Data Logger
are RTD thermistor-type sensors that differ from the
sensors used for unit control. The CargoWatch
sensors are connected directly to the HMI Control
Panel.
IMPORTANT
The CargoWatch sensors ARE NOT inter-
changeable with the unit temperature sensors.
These thermistor sensors change resistance as the
temperature changes. Resistance values can be
measured using a high quality ohmmeter and
compared to a table to directly determine the
temperature.
Note that these resistance values only
apply to CargoWatch sensors.
CargoWatch Sensor
No Shrink Tubing
For testing and replacement of the CargoWatch
Sensors see Service Procedure D04A Checking
CargoWatch Sensors.
2-23
31 January 2005
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