Table of Contents :

• 1. Introduction
  • 1.1 What is LoRaWAN Pressure Sensor
  • 1.2 ​Features
  • 1.3 Specification
  • 1.4 Probe Types
    • 1.4.1 Thread Installation Type
    • 1.4.2 Immersion Type
    • 1.4.3 Wireless Differential Air Pressure Sensor
  • 1.5 Application and Installation
    • 1.5.1 Thread Installation Type
    • 1.5.2 Immersion Type
    • 1.5.3 Wireless Differential Air Pressure Sensor
  • 1.6 Sleep mode and working mode
  • 1.7 Button & LEDs
  • 1.8 Pin Mapping
  • 1.9 BLE connection
  • 1.10 Mechanical
    • 1.10.1 for LB version
    • 1.10.2 for LS version
• 2. Configure PS-LB/LS to connect to LoRaWAN network
  • 2.1 How it works
  • 2.2 ​Quick guide to connect to LoRaWAN server (OTAA)
  • 2.3 ​Uplink Payload
    • 2.3.1 Device Status, FPORT=5
    • 2.3.2 Sensor value, FPORT=2
    • 2.3.3 Battery Info
    • 2.3.4 Probe Model
    • 2.3.5 0~20mA value (IDC_IN)
    • 2.3.6 0~30V value (pin VDC_IN)
    • 2.3.7 IN1&IN2&INT pin
    • 2.3.8 Sensor value, FPORT=7
    • 2.3.9 ​Decode payload in The Things Network
  • 2.4 Uplink Interval
  • 2.5 Show Data in DataCake IoT Server
  • 2.6 Datalog Feature (Since V1.1)
    • 2.6.1 Unix TimeStamp
    • 2.6.2 Set Device Time
    • 2.6.3 Poll sensor value
    • 2.6.4 Decoder in TTN V3
  • 2.7 Frequency Plans
  • 2.8 Report on Change Feature (Since firmware V1.1.2)
    • 2.8.1 Uplink payload(Enable ROC)
    • 2.8.2 Set the Report on Change
  • 2.9 ​Firmware Change Log
• 3. Configure PS-LB/LS
  • 3.1 Configure Methods
  • 3.2 General Commands
  • 3.3 Commands special design for PS-LB/LS
    • 3.3.1 Set Transmit Interval Time
    • 3.3.2 Set Interrupt Mode
    • 3.3.3 Set the output time
    • 3.3.4 Set the Probe Model
    • 3.3.5 Multiple collections are one uplink (Since firmware V1.1)
• 4. Battery & Power Consumption
• 5. OTA firmware update
• 6. FAQ
  • 6.1 How to use AT Command  via UART to access device?
  • 6.2 How to update firmware via UART port?
  • 6.3 How to change the LoRa Frequency Bands/Region?
  • 6.4 How to measure the depth of other liquids other than water?
• 7. Troubleshooting
  • 7.1 Water Depth Always shows 0 in payload
• 8. Order Info
• 9. ​Packing Info
• 10. Support

1. Introduction

1.1 What is LoRaWAN Pressure Sensor

1.2 ​Features

• LoRaWAN 1.0.3 Class A
• Ultra-low power consumption
• Measure air / gas or water pressure
• Different pressure range available
• Thread Installation Type or Immersion Type
• Monitor Battery Level
• Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
• Support Bluetooth v5.1 and LoRaWAN remote configure
• Support wireless OTA update firmware
• Uplink on periodically
• Downlink to change configure
• Controllable 3.3v,5v and 12v output to power external sensor
• 8500mAh Li/SOCl2 Battery (PS-LB)
• Solar panel + 3000mAh Li-ion battery (PS-LS)

1.3 Specification

Micro Controller:

• MCU: 48Mhz ARM
• Flash: 256KB
• RAM: 64KB

Common DC Characteristics:

• Supply Voltage: Built-in Battery , 2.5v ~ 3.6v
• Operating Temperature: -40 ~ 85°C

LoRa Spec:

• Frequency Range,  Band 1 (HF): 862 ~ 1020 Mhz,Band 2 (LF): 410 ~ 528 Mhz
• Max +22 dBm constant RF output vs.
• RX sensitivity: down to -139 dBm.
• Excellent blocking immunity

Current Input Measuring :

• Range: 0 ~ 20mA
• Accuracy: 0.02mA
• Resolution: 0.001mA

Voltage Input Measuring:

• Range: 0 ~ 30v
• Accuracy: 0.02v
• Resolution: 0.001v

Battery:

• Li/SOCI2 un-chargeable battery
• Capacity: 8500mAh
• Self-Discharge: <1% / Year @ 25°C
• Max continuously current: 130mA
• Max boost current: 2A, 1 second

Power Consumption

• Sleep Mode: 5uA @ 3.3v
• LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm

1.4 Probe Types

1.4.1 Thread Installation Type

• Hersman Pressure Transmitter
• Measuring Range: -0.1 ~ 0 ~ 60MPa, see order info.
• Accuracy: 0.2% F.S
• Long-Term Stability: 0.2% F.S ±0.05%
• Overload 200% F.S
• Zero Temperature Drift: 0.03% FS/℃(≤100Kpa), 0.02%FS/℃(＞100Kpa)
• FS Temperature Drift: 0.003% FS/℃(≤100Kpa), 0.002%FS/℃(＞100Kpa)
• Storage temperature: -30℃~80℃
• Operating temperature: -20℃~60℃
• Connector Type: Various Types, see order info

1.4.2 Immersion Type

• Immersion Type, Probe IP Level: IP68
• Measuring Range: Measure range can be customized, up to 100m.
• Accuracy: 0.2% F.S
• Long-Term Stability: ±0.2% F.S / Year
• Storage temperature: -30°C~80°C
• Operating temperature: 0°C~50°C
• Material: 316 stainless steels

1.4.3 Wireless Differential Air Pressure Sensor

• Measuring Range: -100KPa~0~100KPa(Optional measuring range).
• Accuracy: 0.5% F.S, resolution is 0.05%.
• Overload: 300% F.S
• Zero temperature drift: ±0.03%F.S/°C
• Operating temperature: -20°C~60°C
• Storage temperature:  -20°C~60°C
• Compensation temperature: 0~50°C

1.5 Application and Installation

1.5.1 Thread Installation Type

Application:

• Hydraulic Pressure
• Petrochemical Industry
• Health and Medical
• Food & Beverage Processing
• Auto-controlling house
• Constant Pressure Water Supply
• Liquid Pressure measuring

Order the suitable thread size and install to measure the air / liquid pressure

1.5.2 Immersion Type

Application:

Liquid & Water Pressure / Level detect.

Below is the wiring to for connect the probe to the device.

The Immersion Type Sensor has different variant which defined by Ixx. For example, this means two points:

• Cable Length: 10 Meters
• Water Detect Range: 0 ~ 10 Meters.

1.5.3 Wireless Differential Air Pressure Sensor

Application:

Indoor Air Control & Filter clogging Detect.

Below is the wiring to for connect the probe to the device.

Size of wind pressure transmitter:

Note: The above dimensions are measured by hand, and the numerical error of the shell is within ±0.2mm.

1.6 Sleep mode and working mode

Deep Sleep Mode: Sensor doesn't have any LoRaWAN activate. This mode is used for storage and shipping to save battery life.

Working Mode: In this mode, Sensor will work as LoRaWAN Sensor to Join LoRaWAN network and send out sensor data to server. Between each sampling/tx/rx periodically, sensor will be in IDLE mode), in IDLE mode, sensor has the same power consumption as Deep Sleep mode.

1.7 Button & LEDs

1.8 Pin Mapping

1.9 BLE connection

PS-LB/LS support BLE remote configure.

BLE can be used to configure the parameter of sensor or see the console output from sensor. BLE will be only activate on below case:

• Press button to send an uplink
• Press button to active device.
• Device Power on or reset.

If there is no activity connection on BLE in 60 seconds, sensor will shut down BLE module to enter low power mode.

1.10 Mechanical

1.10.1 for LB version

1.10.2 for LS version

2. Configure PS-LB/LS to connect to LoRaWAN network

2.1 How it works

The PS-LB/LS is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a local LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and activate the PS-LB/LS. It will automatically join the network via OTAA and start to send the sensor value. The default uplink interval is 20 minutes.

2.2 ​Quick guide to connect to LoRaWAN server (OTAA)

Following is an example for how to join the TTN v3 LoRaWAN Network. Below is the network structure; we use the LPS8v2  as a LoRaWAN gateway in this example. 

The LPS8V2 is already set to connected to TTN network , so what we need to now is configure the TTN server.

Step 1: Create a device in TTN with the OTAA keys from PS-LB/LS.

Each PS-LB/LS is shipped with a sticker with the default device EUI as below:

You can enter this key in the LoRaWAN Server portal. Below is TTN screen shot:

Register the device

Add APP EUI and DEV EUI

Add APP EUI in the application

Add APP KEY

Step 2: Activate on PS-LB/LS

Press the button for 5 seconds to activate the PS-LB/LS.

Green led will fast blink 5 times, device will enter OTA mode for 3 seconds. And then start to JOIN LoRaWAN network. Green led will solidly turn on for 5 seconds after joined in network.

After join success, it will start to upload messages to TTN and you can see the messages in the panel.

2.3 ​Uplink Payload

2.3.1 Device Status, FPORT=5

Include device configure status. Once PS-LB/LS Joined the network, it will uplink this message to the server.

Users can also use the downlink command(0x26 01) to ask PS-LB/LS to resend this uplink.

Example parse in TTNv3

Sensor Model: For PS-LB/LS, this value is 0x16

Firmware Version: 0x0100, Means: v1.0.0 version

Frequency Band:

*0x01: EU868

*0x02: US915

*0x03: IN865

*0x04: AU915

*0x05: KZ865

*0x06: RU864

*0x07: AS923

*0x08: AS923-1

*0x09: AS923-2

*0x0a: AS923-3

*0x0b: CN470

*0x0c: EU433

*0x0d: KR920

*0x0e: MA869

Sub-Band:

AU915 and US915:value 0x00 ~ 0x08

CN470: value 0x0B ~ 0x0C

Other Bands: Always 0x00

Battery Info:

Check the battery voltage.

Ex1: 0x0B45 = 2885mV

Ex2: 0x0B49 = 2889mV

2.3.2 Sensor value, FPORT=2

Uplink payload includes in total 9 bytes.
 

2.3.3 Battery Info

Check the battery voltage for PS-LB/LS.

Ex1: 0x0B45 = 2885mV

Ex2: 0x0B49 = 2889mV

2.3.4 Probe Model

PS-LB/LS has different kind of probe, 4~20mA represent the full scale of the measuring range. So a 12mA output means different meaning for different probe.  

For example.

The probe model field provides the convenient for server to identical how it should parse the 4~20mA sensor value and get the correct value.

2.3.5 0~20mA value (IDC_IN)

The output value from Pressure Probe, use together with Probe Model to get the pressure value or water level.

Example:

27AE(H) = 10158 (D)/1000 = 10.158mA.

Instead of pressure probe, User can also connect a general 4~20mA in this port to support different types of 4~20mA sensors. below is the connection example:

2.3.6 0~30V value (pin VDC_IN)

Measure the voltage value. The range is 0 to 30V.

Example:

138E(H) = 5006(D)/1000= 5.006V

2.3.7 IN1&IN2&INT pin

IN1 and IN2 are used as digital input pins.

Example:

09 (H): (0x09&0x08)>>3=1    IN1 pin is high level.

09 (H): (0x09&0x04)>>2=0    IN2 pin is low level.

This data field shows if this packet is generated by Interrupt Pin or not. Click here for the hardware and software set up. Note: The Internet Pin is a separate pin in the screw terminal.

Example:

09 (H): (0x09&0x02)>>1=1    The level of the interrupt pin.

09 (H): 0x09&0x01=1              0x00: Normal uplink packet.

0x01: Interrupt Uplink Packet.

2.3.8 Sensor value, FPORT=7

Multiple sets of data collected are displayed in this form：

[voltage value1], [voltage value2], [voltage value3],…[voltage value n/2]

2.3.9 ​Decode payload in The Things Network

While using TTN network, you can add the payload format to decode the payload.

PS-LB/LS TTN Payload Decoder: https://github.com/dragino/dragino-end-node-decoder

2.4 Uplink Interval

The PS-LB/LS by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H4.1ChangeUplinkInterval

2.5 Show Data in DataCake IoT Server

DATACAKE provides a human friendly interface to show the sensor data, once we have data in TTN, we can use DATACAKE to connect to TTN and see the data in DATACAKE. Below are the steps:

Step 1: Be sure that your device is programmed and properly connected to the network at this time.

Step 2: To configure the Application to forward data to DATACAKE you will need to add integration. To add the DATACAKE integration, perform the following steps:

Step 3: Create an account or log in Datacake.

Step 4: Create PS-LB/LS product.

Step 5: add payload decode

After added, the sensor data arrive TTN, it will also arrive and show in Datacake.

2.6 Datalog Feature (Since V1.1)

When a user wants to retrieve sensor value, he can send a poll command from the IoT platform to ask the sensor to send value in the required time slot.

2.6.1 Unix TimeStamp

CPL01 uses Unix TimeStamp format based on

Users can get this time from the link:  https://www.epochconverter.com/ :

Below is the converter example:

2.6.2 Set Device Time

There are two ways to set the device's time:

1. Through LoRaWAN MAC Command (Default settings)

Users need to set SYNCMOD=1 to enable sync time via the MAC command.

Once CPL01 Joined the LoRaWAN network, it will send the MAC command (DeviceTimeReq) and the server will reply with (DeviceTimeAns) to send the current time to CPL01. If CPL01 fails to get the time from the server, CPL01 will use the internal time and wait for the next time request [via Device Status (FPORT=5)].

Note: LoRaWAN Server needs to support LoRaWAN v1.0.3(MAC v1.0.3) or higher to support this MAC command feature.

 2. Manually Set Time

Users need to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.

2.6.3 Poll sensor value

Users can poll sensor values based on timestamps. Below is the downlink command.

Timestamp start and Timestamp end-use Unix TimeStamp format as mentioned above. Devices will reply with all data logs during this period, using the uplink interval.

For example, downlink command 

Is to check 2021/11/12 12:00:00 to 2021/11/12 15:00:00's data

Uplink Internal =5s，means CPL01 will send one packet every 5s. range 5~255s.

2.6.4 Decoder in TTN V3

Please check the decoder from this link: https://github.com/dragino/dragino-end-node-decoder

2.7 Frequency Plans

The PS-LB/LS uses OTAA mode and below frequency plans by default. Each frequency band use different firmware, user update the firmware to the corresponding band for their country.

http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20Frequency%20Band/a

2.8 Report on Change Feature (Since firmware V1.1.2)

2.8.1 Uplink payload(Enable ROC)

Used to Monitor the IDC and VDC increments, and send ROC uplink when the IDC or VDC changes exceed.

With ROC enabled, the payload is as follows:

IN1 &IN2 , Interrupt  flag , ROC_flag:

• IDC_Roc_flagL

80 (H): (0x80&0x80)=80(H)=1000 0000(B)    bit7=1, "TRUE", This uplink is triggered when the decrease in the IDC compared to the last ROC refresh exceeds the set threshold.

60 (H): (0x60&0x80)=0    bit7=0, "FALSE", This uplink is not triggered when the decrease in the IDC compared to the last ROC refresh exceeds the set threshold.

• IDC_Roc_flagH

60 (H): (0x60&0x40)=60(H)=01000 0000(B)    bit6=1, "TRUE", This uplink is triggered when the increase in the value of the IDC compared to the last ROC refresh exceeds the set threshold.

80 (H): (0x80&0x40)=0    bit6=0, "FALSE", This uplink is not triggered when the increase in the value of the IDC compared to the last ROC refresh exceeds the set threshold.

• VDC_Roc_flagL

20 (H): (0x20&0x20)=20(H)=0010 0000(B)    bit5=1, "TRUE", This uplink is triggered when the decrease in the VDC compared to the last ROC refresh exceeds the set threshold.

90 (H): (0x90&0x20)=0    bit5=0, "FALSE", This uplink is not triggered when the decrease in the VDC compared to the last ROC refresh exceeds the set threshold.

• VDC_Roc_flagH

90 (H): (0x90&0x10)=10(H)=0001 0000(B)    bit4=1, "TRUE", This uplink is triggered when the increase in the value of the VDC compared to the last ROC refresh exceeds the set threshold.

20 (H): (0x20&0x10)=0    bit4=0, "FALSE", This uplink is not triggered when the increase in the value of the VDC compared to the last ROC refresh exceeds the set threshold.

• IN1_pin_level & IN2_pin_level

IN1 and IN2 are used as digital input pins.

80 (H): (0x80&0x08)=0    IN1 pin is low level.

80 (H): (0x09&0x04)=0    IN2 pin is low level.

• Exti_pin_level &Exti_status

This data field shows whether the packet is generated by an interrupt pin.

Note: The Internet pin of the old motherboard is a separate pin in the screw terminal, and the interrupt pin of the new motherboard(SIB V1.3) is the GPIO_EXTI pin.

Exti_pin_level:  80 (H): (0x80&0x02)=0  "low", The level of the interrupt pin.

Exti_status: 80 (H): (0x80&0x01)=0   "False", Normal uplink packet.

2.8.2 Set the Report on Change

Feature: Set the detection interval and threshold to monitor whether the IDC/VDC variable exceeds the threshold. If the threshold is exceeded, an ROC uplink is sent.
AT Command: AT+ROC

Example:

• AT+ROC=1,60,3000, 500      // Check value every 60 seconds. lf there is change in IDC (>3mA) or VDC (>500mV), sends an ROC uplink.
• AT+ROC=1,60,3000,0      // Check value every 60 seconds. lf there is change in IDC (>3mA), send an ROC uplink. 0 Means doesn't monitor Voltage.

Downlink Command: 0x09 aa bb cc dd

Format: Function code (0x09) followed by 4 bytes. 

aa: Enable/Disable the ROC.

bb: Set the detection interval. (second)

cc: Setting the IDC change threshold. (uA)

dd: Setting the VDC change threshold. (mV)

Example: 

• Downlink Payload: 09 01 00 3C 0B B8 01 F4       // Equal to AT+ROC=1,60,3000, 500
• Downlink Payload: 09 01 00 3C 0B B8 00 00       // AT+ROC=1,60,3000,0

Screenshot of parsing example in TTN:

• AT+ROC=1,60,3000, 500.

2.9 ​Firmware Change Log

Firmware download link:

https://www.dropbox.com/sh/gf1glloczbzz19h/AABbuYI4WY6VdAmpXo6o1V2Ka?dl=0

3. Configure PS-LB/LS

3.1 Configure Methods

PS-LB/LS supports below configure method:

• AT Command via Bluetooth Connection (Recommand Way): BLE Configure Instruction.
• AT Command via UART Connection : See FAQ.
• LoRaWAN Downlink.  Instruction for different platforms: See IoT LoRaWAN Server section.

3.2 General Commands

These commands are to configure:

• General system settings like: uplink interval.
• LoRaWAN protocol & radio related command.

They are same for all Dragino Devices which support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki:

http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/

3.3 Commands special design for PS-LB/LS

These commands only valid for PS-LB/LS, as below:

3.3.1 Set Transmit Interval Time

Feature: Change LoRaWAN End Node Transmit Interval.

AT Command: AT+TDC

Downlink Command: 0x01

Format: Command Code (0x01) followed by 3 bytes time value.

If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.

• Example 1: Downlink Payload: 0100001E       //  Set Transmit Interval (TDC) = 30 seconds
• Example 2: Downlink Payload: 0100003C       //  Set Transmit Interval (TDC) = 60 seconds

3.3.2 Set Interrupt Mode

Feature, Set Interrupt mode for GPIO_EXIT.

AT Command: AT+INTMOD

Downlink Command: 0x06

Format: Command Code (0x06) followed by 3 bytes.

This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.

• Example 1: Downlink Payload: 06000000       //  Turn off interrupt mode
• Example 2: Downlink Payload: 06000003      //   Set the interrupt mode to rising edge trigger

3.3.3 Set the output time

Feature, Control the output 3V3 , 5V or 12V.

AT Command: AT+3V3T

AT Command: AT+5VT

AT Command: AT+12VT

Downlink Command: 0x07

Format: Command Code (0x07) followed by 3 bytes.

The first byte is which power, the second and third bytes are the time to turn on.

• Example 1: Downlink Payload: 070101F4  --->   AT+3V3T=500
• Example 2: Downlink Payload: 0701FFFF   --->  AT+3V3T=65535
• Example 3: Downlink Payload: 070203E8  --->  AT+5VT=1000
• Example 4: Downlink Payload: 07020000  --->  AT+5VT=0
• Example 5: Downlink Payload: 070301F4  --->  AT+12VT=500
• Example 6: Downlink Payload: 07030000  --->  AT+12VT=0

3.3.4 Set the Probe Model

Users need to configure this parameter according to the type of external probe. In this way, the server can decode according to this value, and convert the current value output by the sensor into water depth or pressure value.

AT Command: AT +PROBE

AT+PROBE=aabb

When aa=00, it is the water depth mode, and the current is converted into the water depth value; bb is the probe at a depth of several meters.

When aa=01, it is the pressure mode, which converts the current into a pressure value;

bb represents which type of pressure sensor it is.

(A->01,B->02,C->03,D->04,E->05,F->06,G->07,H->08,I->09,J->0A,K->0B,L->0C)

When aa=02, it is the Differential Pressure Sensor , which converts the current into a pressure value;

bb represents which type of pressure sensor it is.

(0~100Pa->01,0~200Pa->02,0~300Pa->03,0~1KPa->04,0~2KPa->05,0~3KPa->06,0~4KPa->07,0~5KPa->08,0~10KPa->09,-100~ 100Pa->0A,-200~ 200Pa->0B,-1~ 1KPa->0C)

Downlink Command: 0x08

Format: Command Code (0x08) followed by 2 bytes.

• Example 1: Downlink Payload: 080003  --->   AT+PROBE=0003
• Example 2: Downlink Payload: 080101  --->   AT+PROBE=0101

3.3.5 Multiple collections are one uplink (Since firmware V1.1)

Added AT+STDC command to collect the voltage of VDC_INPUT/IDC_INPUT multiple times and upload it at one time.

AT Command: AT +STDC

AT+STDC=aa,bb,bb

aa:
0: means disable this function and use TDC to send packets.
1: means that the function is enabled to send packets by collecting VDC data for multiple times.
2: means that the function is enabled to send packets by collecting IDC data for multiple times.
bb: Each collection interval (s), the value is 1~65535
cc: the number of collection times, the value is 1~120

Downlink Command: 0xAE

Format: Command Code (0xAE) followed by 4 bytes.

• Example 1: Downlink Payload: AE 01 02 58 12 --->   AT+STDC=1,600,18

4. Battery & Power Consumption

PS-LB use ER26500 + SPC1520 battery pack and PS-LS use 3000mAh Recharable Battery with Solar Panel. See below link for detail information about the battery info and how to replace.

Battery Info & Power Consumption Analyze .

5. OTA firmware update

Please see this link for how to do OTA firmware update: http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20OTA%20Update%20for%20Sensors/

6. FAQ

6.1 How to use AT Command  via UART to access device?

See: http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H1.LoRaSTv4baseHardware

6.2 How to update firmware via UART port?

See: http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H1.LoRaSTv4baseHardware

6.3 How to change the LoRa Frequency Bands/Region?

You can follow the instructions for how to upgrade image.
When downloading the images, choose the required image file for download. ​

6.4 How to measure the depth of other liquids other than water?

Test the current values at the depth of different liquids and convert them to a linear scale.
Replace its ratio with the ratio of water to current in the decoder.

Example:

Measure the corresponding current of the sensor when the liquid depth is 2.04m and 0.51m.

Calculate scale factor：
Use these two data to calculate the current and depth scaling factors：(7.888-5.035)/(2.04-0.51)=1.86470588235294

Calculation formula：

Use the calibration formula：(Current current - Minimum calibration current)/Scale factor + Minimum actual calibration height

Actual calculations：

Use this formula to calculate the value corresponding to the current at a depth of 1.5 meters: (6.918-5.035)/1.86470588235294+0.51=1.519810726 

Error：

0.009810726

7. Troubleshooting

7.1 Water Depth Always shows 0 in payload

If your device's IDC_intput_mA is normal, but your reading always shows 0, please refer to the following points:

1. Please set it to mod1

2. Please set the command AT+PROBE according to the model of your sensor

3. Check the connection status of the sensor

8. Order Info

9. ​Packing Info

Package Includes:

• PS-LB or PS-LS LoRaWAN Pressure Sensor

Dimension and weight:

• Device Size: cm
• Device Weight: g
• Package Size / pcs : cm
• Weight / pcs : g

10. Support

• Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.

• Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to Support@dragino.cc.