> For the complete documentation index, see [llms.txt](https://docs.efento.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.efento.io/nb-iot-loggers/installation/logger-specific-installation-guidelines/0-10-v-loggers.md).
# 0-10 V loggers
Efento 0–10 V loggers are engineered to measure analog voltage signals and seamlessly transmit this data over NB-IoT networks directly to Efento Cloud or your custom backend server. They can be used to monitor any standard sensor probe equipped with a 0–10 V interface or simply to measure baseline voltage across a variety of industrial applications.
## Channel compatibility and specifications
Each logger can support up to three independent analog channels.
The logger features a wide input voltage measurement range of **0 to 24 V**, boasting a high resolution (LSB) of **1.6 mV** and an input impedance of **1M Ω**.
## Connecting the probes
To wire your 0–10 V sensors to the terminal blocks, you must first access the Printed Circuit Board (PCB) by opening the logger's enclosure.
{% hint style="warning" %}
**WARNING**: The logger must be completely powered off before connecting the probes. Connecting the probes while the device is live can cause electrical shorts, lead to inaccurate sensor readings, or permanently damage the logger's internal circuitry. **To switch off the logger, press and hold the power button located on the PCB for 7 seconds until both LEDs begin to blink in a distinct shutdown sequence.**
{% endhint %}
{% stepper %}
{% step %}
#### Open the enclosure
Refer to the [Inserting the SIM card and powering](/nb-iot-loggers/installation/inserting-the-sim-card-and-powering-on.md) on section for full details on opening your specific casing model:
* IP30 Enclosures: Use a flat tool or small screwdriver to gently pry open the back panel. remove the front cover, unscrew the internal protective plastic shield (2 screws), and lift out the mainboard.
* IP67 Enclosures: Unscrew and remove the external screws securing the front and back panels together, remove the front cover, unscrew the internal protective plastic shield (2 screws), and lift out the mainboard.
{% endstep %}
{% step %}
#### Route the cables
Route the sensor cables through the designated holes on the bottom or side of the enclosure. Feed the sensor wires through the glands before connecting them to the board.
{% endstep %}
{% step %}
#### Wire to the terminal blocks
Connect the individual wire leads of your probe to the appropriate screw terminal channels on the PCB ([Power configuration / wiring](#power-configuration-wiring)). Double-check your sensor's data sheet for correct pinouts to prevent polarity reversal.
{% endstep %}
{% step %}
#### **Secure the hardware settings**
Before closing the device, verify that your Sensor Power DIP switch ([Power configuration / wiring](#power-configuration-wiring)) is correctly positioned to match your specific probe type.
{% endstep %}
{% step %}
#### Reassemble the device
Connect the power board connector and firmly seat the mainboard back into its designated position. Place the internal plastic cover over the board and secure it with the two internal screws. Finally, close the outer casing by snapping the back panel shut (IP30) or evenly tightening the external cover screws to maintain the weather-tight seal (IP67).
{% endstep %}
{% endstepper %}
## Power configuration / wiring
The logger offers two distinct operational modes for supplying electrical power to your connected sensors: **logger-powered (passive mode)** and **externally powered (active mode)**.
Logger-powered probes (passive mode)
### Logger-powered probes (passive mode)
Efento 0-10 V loggers feature an internal, regulated voltage source capable of supplying up to **18 V and 30 mA** to power connected passive probes). This internal power line is fully equipped with built-in over-current and short-circuit protection to safeguard both the logger and your sensors.
This hardware setting is manually configured via the onboard DIP switch labeled "Sensor Power". To enable, toggle the "Sensor Power" DIP switch to the ON position.
Wiring diagram:
Externally powered probes (active mode)
### Externally powered probes (active mode)
Alternatively, you can choose to power the connected probes using an independent external power supply.
This hardware setting is manually configured via the onboard DIP switch labeled "Sensor Power". To enable, toggle the "Sensor Power" DIP switch to the OFF position.
Wiring diagram:
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