> 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/external-probes-installation.md).

# External probes installation

Many Efento loggers use temperature or other probes for measurements in refrigerators, freezers, cold rooms, or industrial environments. Proper installation is critical to maintain both measurement accuracy and environmental safety.

## **Avoid damaging the probe cable** <a href="#avoid-damaging-the-probe-cable" id="avoid-damaging-the-probe-cable"></a>

* Route the probe cable along stable surfaces (racks, walls) to prevent accidental pulling, pinching, or abrasion.
* Use cable ties or clips to secure the cable and prevent movement caused by opening/closing doors.
* Do not bend the cable sharply - maintain smooth curvature.

## **Prevent air leakage into refrigerators/freezers** <a href="#prevent-air-leakage-into-refrigerators-freezers" id="prevent-air-leakage-into-refrigerators-freezers"></a>

Refrigerators and freezers must remain airtight to maintain consistent temperature and energy efficiency.

**To avoid air ingress:**

* Never run the probe cable through the door seal without protection - it may damage the seal and cause frost buildup or temperature fluctuations.
* Instead, use:
  * Dedicated cable passages (often found at the back or side of refrigerators).
  * A soft seal or foam grommet around the cable to maintain insulation and airtightness.
* Ensure the seal or insulation material closes tightly around the probe cable.

## **Probe placement inside cold chambers** <a href="#probe-placement-inside-cold-chambers" id="probe-placement-inside-cold-chambers"></a>

* Position the probe in the center area of the refrigerated space - not touching walls, shelves, or products.
* Avoid areas close to air vents or evaporators, as temperature there may not reflect true storage conditions.
* For freezers:
  * Ensure the probe is rated for low temperatures.
  * Protect the cable from becoming brittle by securing it and avoiding tight bends.


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