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Fig. 2.9 Conversion Curve; depth vs. voltage
IMPORTANT
The pressure sensor is a non-linear device and the characteristic varies from device
to device. As the calibration data for the sensor in use are stored in the EEROM (U5
on SEN board), the sensor and SEN board should be used as a pair, that is, both the
sensor and SEN board should be replaced if either of them is defective.
Temperature Measurement
The thermistor, which has characteristics shown in Fig. 2.10, is used as the sensor device.
The variation of resistance caused by variation of temperature is converted to variation of
voltage (shown in Fig. 2.11) by the TEMP AMP circuit and fed to the CPU through the A/D
converter on the CONT B board.
Fig. 2.10 Characteristics of the thermistor
2-6
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