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Last modified by Mengting Qiu on 2024/09/05 17:35
From version 84.4
edited by Xiaoling
on 2023/09/11 14:25
Change comment: There is no comment for this version
To version 83.3
edited by Xiaoling
on 2023/09/11 13:44
Change comment: There is no comment for this version

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3 3  
4 4  
5 5  **Table of Contents:**
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16 16  == 1.1 What is DDS20-NB NB-IoT Ultrasonic liquid level Sensor ==
17 17  
18 18  
19 -The Dragino DDS20-NB is a **NB-IoT Ultrasonic liquid level sensor** for Internet of Things solution. It uses **none-contact method **to measure the **height of liquid** in a container without opening the container, and send IoT platform via NB-IoT network.
18 +The Dragino S31-NB and S31B-NB are (% style="color:blue" %)**NB-IoT Temperature and Humidity Sensor**(%%) for Internet of Things solution. It is used to measure the surrounding (% style="color:blue" %)**environment temperature and relative air humidity precisely**(%%), and then upload to IoT server via NB-IoT network*.
20 20  
21 -The DDS20-NB sensor is installed directly below the container to detect the height of the liquid level. User doesn't need to open a hole on the container to be tested. The none-contact measurement makes the measurement safety, easier and possible for some strict situation. 
20 +The temperature & humidity sensor used in S31-NB is SHT31, which is fully calibrated, linearized, and temperature compensated digital output from Sensirion, it provides a strong reliability and long-term stability. The SHT31 is fixed in a (% style="color:blue" %)**waterproof anti-condensation casing**(%%) for long term use.
22 22  
23 -DDS20-NB uses **ultrasonic sensing technology** for distance measurement. DDS20-NB is of high accuracy to measure various liquid such as: **toxic substances**, **strong acids**, **strong alkalis** and **various pure liquids** in high-temperature and high-pressure airtight containers.
22 +S31-NB supports different uplink methods include (% style="color:blue" %)**TCP, MQTT, UDP**(%%) for different application requirement. and Support Uplinks to various IoT Servers.
24 24  
25 -PS-NB-NA supports different uplink methods including **MQTT, MQTTs, UDP & TCP** for different application requirement, and support uplinks to various IoT Servers.
24 +S31-NB is powered by (% style="color:blue" %)**8500mAh Li-SOCI2 battery**(%%), It is designed for long term use up to several years. (Real-world battery life depends on the use environment, update period and uplink method. Please check related Power Analyze report).
26 26  
27 -PS-NB-NA **supports BLE configure **and** OTA update** which make user easy to use.
26 +*make sure you have NB-IoT coverage locally.
28 28  
29 -PS-NB-NA is powered by **8500mAh Li-SOCI2 battery**, it is designed for long-term use up to severa years.
30 30  
31 -PS-NB-NA has optional built-in SIM card and default IoT server connection version. Which makes it works with simple configuration.
29 +[[image:1692411831805-116.png]]
32 32  
33 33  
34 -[[image:image-20230911140426-2.png||height="320" width="951"]]
35 -
36 -
37 37  == 1.2 ​Features ==
38 38  
39 39  
40 40  * NB-IoT Bands: B1/B2/B3/B4/B5/B8/B12/B13/B17/B18/B19/B20/B25/B28/B66/B70/B85 @H-FDD
41 41  * Ultra-low power consumption
42 -* Liquid Level Measurement by Ultrasonic technology
43 -* Measure through container, No need to contact Liquid
44 -* Valid level range 20mm - 2000mm
45 -* Accuracy: ±(5mm+S*0.5%) (S: Measure Value)
37 +* External 3 meters SHT31 probe (For S31-NB)
38 +* Measure range -40°C ~~ 85°C
39 +* Temperature & Humidity alarm
46 46  * Multiply Sampling and one uplink
47 47  * Support Bluetooth v5.1 remote configure and update firmware
48 48  * Uplink on periodically
49 49  * Downlink to change configure
50 -* IP66 Waterproof Enclosure
51 51  * 8500mAh Battery for long term use
52 52  * Nano SIM card slot for NB-IoT SIM
53 53  
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56 56  
57 57  (% style="color:blue" %)**Common DC Characteristics:**
58 58  
59 -* Supply Voltage: 2.5v ~~ 3.6v
52 +* Supply Voltage: 2.1v ~~ 3.6v
60 60  * Operating Temperature: -40 ~~ 85°C
61 61  
55 +(% style="color:blue" %)**Temperature Sensor:**
56 +
57 +* Range: -40 to + 80°C
58 +* Accuracy: ±0.2 @ 0-90 °C
59 +* Resolution: 0.1°C
60 +* Long Term Shift: <0.03 °C/yr
61 +
62 +(% style="color:blue" %)**Humidity Sensor: **
63 +
64 +* Range: 0 ~~ 99.9% RH
65 +* Accuracy: ± 2%RH ( 0 ~~ 100%RH)
66 +* Resolution: 0.01% RH
67 +* Long Term Shift: <0.25 %RH/yr
68 +
62 62  (% style="color:blue" %)**NB-IoT Spec:**
63 63  
64 64  (% style="color:#037691" %)**NB-IoT Module: BC660K-GL**
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