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OPERATION
SENSOR SELECT Switches
6 TCM-39032
CHAPTER 2
SENSOR SELECT Switches
The SENSOR SELECT and THERM RANGE switches are used to select sensor
type and, in the case of thermistor sensor, the source current level. Table 2.1
shows the SENSOR SELECT ( THERM RANGE) positions and corresponding
position code. When the sensor switch is changed during TEC mode operation,
the new sensor position code will be indicated on the TEC display for three
seconds.
Table 2.1 SENSOR SELECT Switch Positions.
The 10 µA and 100 µA designations are for the current source level; thermistor
sensor type is implied. When using a thermistor, the supply current depends on
the thermistor operating temperature range and the required temperature
resolution.
The AD590 sensor operates as a current source which is proportional to the
sensed temperature. The LM335 sensor operates as a voltage source which is
proportional to the sensed temperature. Both of these sensors are approximately
linear over their operating ranges. When they are used, the constants C1 and C2
are used for a two-point conversion.
SWITCH Position Code
100 µA -- 01
10 µA -- 02
LM335 -- 03
AD590 -- 04
RTD (with TSC-595) -- 05