Is it possible to connect an external power supply to each channel on a DT80 that is not multiplexed? This would save me having to make up a junction box or run separate wiring. Our sensors have a settling time that is too long to wait for each one.

Hi Charles,

Connecting an external power is possible but I am still lost to your requirement. Can you please explain in detail? What is the sensor you want to read and why does it need a long wait time? What is the sensor output that the logger needs to read?

Best regards,
Rudy Gunawan

It's a HS 420 series accelerometer, which is actually a 4-20 mA velometer.

Hi Charles,

Since the sensor has 4-20 mA output and uses a junction box, I assume you try to utilize the internal shunt resistor. It would be neat on wiring, but because the internal shunt resistor is separated by relay, the logger would only close the relay when the measurement is due.

Obviously, because the shunt resistor is not connected to the 4-20 mA circuit, you may experience a required delay on measurement (long wait time). I recommend you to use an external 100 ohms shunt resistor instead and perhaps resistor network type to get the wiring neat for each terminal. Furthermore, if you utilize the external shunt resistor, you can connect more than one sensor per terminal.

Best regards,
dataTaker Expert