How We Chose and Tested the Enclosure Material for Industrial LoRa Sensor Probe

The industrial IoT products must meet the standards of robustness, reliability, and accuracy. Check out how we tested different materials, and chose the optimal enclosure material for LoRa sensor probe.

#Special Updates: Here at Seeed, we’ve been working on developing industrial IoT products. And in this new series of blog posts, we will show you some behind-the-stage scenes of how these products are tested to meet the industry standards. In the previous weeks, we shared the followings:

And this week we will zoom in to specific products and share with you how we test different materials for LoRaWAN specific Sensors.

(SenseCAP LoRaWAN deployed in an outdoor tea plantation)

We value products’ stability and accuracy dear to our hearts, as we know these features very important for our users, especially in industrial application scenarios. Since different products have different features, they need different testing methods in various testing environments. In this post, I am giving you a glimpse of how we chose and tested materials for Air Temperature & Humidity Sensor and Barometric Pressure Sensor.

In the process of designing the products, we need to consider the material’s robustness, durability as well as how it can reduce the environment’s influences such as solar radiation, reflection, and precipitation as well accumulated temperature on the sensor probes in monitoring environmental data results.

And we selected the following materials at the early stage:

  • PE
  • PTFE
  • Metal, bore diameter: 30~40μm
  • Metal, bore diameter: 60~90μm
  • Gravel

Gravel was discarded right after the first testing because of insufficient robustness. As a result, we chose PE, PTFE, and Metal (two different bore diameters) for the follow-up testings.

(SenseCAP Air Temperature & Humidity Sensor under testing of accumulated temperature in the normal outdoor environment )

We tested the materials and compared their performances in the following aspects respectively:

  • Waterproof functionality
  • Dustproof functionality
  • Robustness & Durability
  • Accumulated Temperature: test and compare the test results of each sensor probe in different conditions, including bare board, covered with the above-mentioned materials, etc.; and then chose the material with which the data is closest to the actual data.
  • Plunge Test: test the response rate and sensitivity of the sensor within the range of -40℃ and 80℃ by comparing the response rate curves of different versions of the sensors.

After comparing the testing results of different elements, we’ve chosen the optimal material for the probe enclosure. It features waterproof, dustproof and its performance can withstand the influence of the surrounding environments. As a result, for these two sensors, the sensor node is IP66 rated, and the sensor probe is IP65 rated, suitable for deploying in outdoor scenarios for a long time.

(SenseCAP Air Temperature & Humidity Sensor LoRaWAN)

That’s all for this week’s update on the testing of Seeed industrial IoT products. Stay tuned for our next updates!

About SenseCAP

SenseCAP is a series of industrial IoT products. Its LoRaWAN version is based on LoRaWAN protocol and deployable worldwide with multiple ISM bands. SenseCAP is encapsulated in an IP66 enclosure, making it applicable in outdoor remote sensing scenarios such as Smart Farming, Smart City, and other IoT applications that need low-power, long-distance, and long-term data collection.

SenseCAP LoRaWAN version is now released, and you can see more details here. If you have any questions, feel free to leave a comment here, email us (iot[at]seeed[dot].cc), or join the discussion at Seeed Forum.

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May 2020