Environmental measurements can be determined by reading a simple voltage output from a sensor. The voltage level is proportional to the measurement parameter. Every NexSens iSIC ships standard with (8) analog channels. (8) additional analog channels can be added with a factory installed analog expansion. The iSIC can measure voltages up to 2.5V (i.e. 0-1V, 0-2.5V, 0-custom voltage). If the sensor outputs a higher voltage, two resistors are required to measure the sensor reading. Contact a NexSens applications engineer for more information regarding a specific sensor.
Single-Ended (Non-Isolated) Voltage Sensors
Connect single-ended analog mV input devices to the analog terminal strip. A diagram of this is shown below:
Figure 1: Non-Isolated Voltage Sensor wiring
Pins AD0 through AD7 can all be used for connecting single-ended analog mV sensors. Eight sensors can be connected at the same time using these pins on the analog terminal strip.
Differential (Isolated) Voltage Sensors
Connect differential analog mV input devices to the analog terminal strip. A diagram of this is shown below:
Figure 2: Isolated Voltage Sensor wiring
Pins AD0 through AD7 can all be used for connecting differential analog mV sensors. Four sensors can be connected at the same time using these pins on the analog terminal strip.
When using differential sensors, connect each pair to the analog pin pair (i.e.: AD0/AD1, AD2/AD3, etc) and the positive voltage wire to the first AD pin.
Loop Powered Voltage Sensors
Connect loop powered voltage sensors to the internal digital analog terminal strip. A diagram of this is shown below:
Figure 3: Loop Powered Voltage Sensor wiring
Pins AD0 through AD7 can all be used for connecting voltage sensors. Eight loop powered voltage sensors can be connected at the same time using these pins on the analog terminal strip.
Note: GND and AGND are wired together because loop powered sensors require both digital and analog signals.
REV: 13G08