Sensoray 518 Manual do Utilizador descarregar pdf (Página 43)

Thermistor/Custom Resistive Sensors

In the following discussion, thermistor is used interchangeably with custom resistive sensor.

Thermistors have much higher resistance than RTD’s over most of their operating range. As a

result, the RTD two-wire configuration is recommended if your sensor will be operating only at

higher resistance values. If your thermistor will be operating at lower resistance values, you

should consider implementing a three- or four-wire hookup to prevent cable-losses.

Thermistors should be connected using shielded cable. The shield should be connected only to

the 7409TC S terminal.

Strain and Pressure Gages

In a typical strain/pressure gage, four wires connect the gage to the measurement system. Two

wires supply gage excitation, while the other two wires carry the gage output signal. If you are

using a six-wire gage, you must connect the gage’s excitation source and sense leads together at

the 7409TC I+ and I- terminals.

Strain and pressure gages should use shielded cable. The shield should be connected only to the

channel S terminal on the 7409TC.

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Sensoray 518 Manual do Utilizador Página 43