Netvox R718PA22 User manual

Model：R718PA22

Wireless Bottom-Mounted Ultrasonic Liquid Level

Sensor

Wireless Bottom-Mounted

Ultrasonic Liquid Level Sensor

R718PA22

User manual

This document contains proprietary technical information which is the property of NETVOX Technology. It

shall be maintained in strict confidence and shall not be disclosed to other parties, in whole or in part, without

written permission of NETVOX Technology. The specifications are subject to change without prior notice.

Table of Content

1. Introduction................................................................................................2

2. Appearance.................................................................................................2

4. Main Characteristics ..................................................................................3

5. Operation....................................................................................................3

6. Data Report ................................................................................................4

7. Installation..................................................................................................7

7.1 Install the sensor at the bottom of the container / tank: .....................7

7.2 How to find the correct detection point..............................................9

8. Important Maintenance Instruction..........................................................10

1. Introduction

The R718PA22 is a wireless communication device that measures the liquid level with an ultrasonic liquid level sensor.

Ultrasonic liquid level sensor installed at the bottom of the container, it may measure water, gasoline, diesel and small, medium,

large capacity storage tanks (metal, plastic, glass material). R718PA22 main unit and the ultrasonic liquid level sensor

communicate via RS485 interface, and the detected data is sent to the other equipment shown which employs compliance

LoraWANTM wireless communication protocol standards.

LoRa Wireless Technology:

LoRa is a wireless communication technology dedicated to long distance and low power consumption. Compared with other

communication methods, LoRa spread spectrum modulation method greatly increases to expand the communication distance.

Widely used in long-distance, low-data wireless communications. For example, automatic meter reading, building automation

equipment, wireless security systems, industrial monitoring. Main features include small size, low power consumption,

transmission distance, anti-interference ability and so on.

LoRaWAN:

LoRaWAN uses LoRa technology to define end-to-end standard specifications to ensure interoperability between devices and

gateways from different manufacturers.

2. Appearance

Indicator

Function Key

Ultrasonic Liquid Level Sensor

4. Main Characteristics

⚫Adopt SX1276 wireless communication module

⚫DC 12V adapter power supply

⚫IP Rating: Main body - IP65/IP67 (optional), ultrasonic probe - IP67

⚫RS485 communication

⚫The base is attached with a magnet that can be attached to a ferromagnetic material object

⚫Compatible with LoRaWANTM Class A

⚫Frequency hopping spread spectrum technology

⚫Configuration parameters can be configured through third-party software platforms

⚫Data can be read and alerts can be set via SMS text and email (optional)

⚫Applicable to third-party platforms: Actility / ThingPark / TTN / MyDevices / Cayenne

5. Operation

On/Off

Power on

External 12V power supply

Turn on

Press and hold the function key for 3 seconds till the green indicator flashes once.

Turn off

(Restore to factory setting)

Press and hold the function key for 5 seconds till the green indicator flashes for 20 times.

Power off

Remove power

Note:

1. At 1st -5th second after power on, the device will be in engineering test mode.

2. Remove and supply the power; the device is at off state by default.

3. On/off interval is suggested to be about 10 seconds to avoid the interference of capacitor

inductance and other energy storage components.

Network Joining

Never joined the network

(Or at factory setting)

Turn on the device to search the network.

The green indicator stays on for 5 seconds: success

The green indicator remains off: fail

Had joined the network

(Not at factory setting.)

Turn on the device to search the previous network.

The green indicator stays on for 5 seconds: success

The green indicator remains off: fail

Fail to join the network

(when the device is on)

Suggest to check the device verification information on the gateway or consult your

platform server provider.

Function Key

Press and hold for 5 seconds

Restore to factory setting / Turn off

The green indicator flashes for 20 times: success

The green indicator remains off: fail

Press once

The device is in the network: The green indicator flashes once

The device is not in the network: The green indicator remains off

6. Data Report

When the device is powered on, it will immediately send a version report and a report of the liquid level status, depth and

temperature.

Before any configuration, the device sends data according to the default configuration.

Default setting:

Max time: Max Interval

Minimum time: Min Interval (detect the current voltage value every Min Interval by default)

Battery Voltage Change: 0x01 (0.1V) //R718PA22 is power by adapter, the value invalid

Depth Change: 0x0001 (1mm)

TemperatureChange: 0x01 (1 ℃)

Note:

The data transmission period of the device has been programmed.

The interval between two reports must be the minimum time

When Battery is 0x00, it represents powered by DC/AC power source

The data report can be decoded by the Netvox LoRaWANApplication Command document and

http://www.netvox.com.cn:8888/page/index

Data report configuration and sending period are as following:

Min. Interval

(Unit:second)

Max. Interval

(Unit:second)

Reportable Change

Current Change≥

Reportable Change

Current Change＜

Reportable Change

Any number between

1~65535

Any number between

1~65535

Can not be 0.

Report

per Min. Interval

Report

per Max. Interval

Example of ConfigureCmd

FPort：0x07

Bytes

Var (Fix =9 Bytes)

CmdID

DeviceType

NetvoxPayLoadData

CmdID–1 byte

DeviceType–1 byte –Device Type of Device

NetvoxPayLoadData–var bytes (Max=9bytes)

Description

Device

Cmd

Device

Type

NetvoxPayLoadData

Config

ReportReq

R718

PA22

0x01

0x9B

MinTime

(2bytes Unit:s)

MaxTime

(2bytes Unit:s)

BatteryChange

(1byte Unit:0.1v)

DepthChange

(2bytes,Unit:1mm)

Temperature

Change

(1byte,Unit:1℃)

Reserved

(1Bytes,Fixed

0x00)

Config

ReportRsp

0x81

Status

(0x00_success)

Reserved

(8Bytes,Fixed 0x00)

ReadConfig

ReportReq

0x02

Reserved

(9Bytes,Fixed 0x00)

ReadConfig

ReportRsp

0x82

MinTime

(2bytes Unit:s)

MaxTime

(2bytes Unit:s)

BatteryChange

(1byte Unit:0.1v)

DepthChange

(2bytes,Unit:1mm)

TemperatureCha

nge

(1byte,Unit:1℃)

Reserved

(1Bytes,Fixed

0x00)

SetMeasure

TypeReq

0x03

Measure type（1byte）

0x01_water,

0x02_gasoline,

0x03_diesel oil

Reserved

(8Bytes,Fixed 0x00)

SetMeasure

TypeRsp

0x83

Status

(0x00_success)

Reserved

(8Bytes,Fixed 0x00)

GetMeasure

TypeReq

0x04

Reserved

(9Bytes,Fixed 0x00)

GetMeasure

TypeRsp

0x84

Measure type（1byte）

0x01_water,

0x02_gasoline,

0x03_diesel oil

Reserved

(8Bytes,Fixed 0x00)

(1) Configure device parameters MinTime = 1min, MaxTime = 1min, BatteryChange = 0.1v, Depth Change = 5mm,

TemperatureChange = 2 ℃

Downlink: 019B003C003C0100050200

The device returns:

819B000000000000000000 (Configuration succeeded)

819B010000000000000000 (Configuration failed)

(2) Read device configuration parameters

Downlink: 029B000000000000000000

The device returns:

829B003C003C0100050200 (current device configuration parameters)

(3) Configure device measure type: 01 = Water, 02 = Gasoline, 03 = Diesel oil

Downlink: 039B020000000000000000 // Gasoline

The device returns:

839B000000000000000000 (Configuration succeeded)

839B010000000000000000 (Configuration failed)

(4) Read device configuration parameters

Downlink: 049B000000000000000000

The device returns:

849B020000000000000000 (current device configuration parameters)

Example for MinTime/MaxTime logic:

Example#1 based on MinTime = 1 Hour, MaxTime= 1 Hour

MaxTime MaxTime

(MinTime) (MinTime)

0H 1H 2H

Note:

MaxTime=MinTime. Data will only be report according to MaxTime (MinTime) duration regardless ON/OFF value.

Example#2 based on MinTime = 15 Minutes, MaxTime= 1 Hour

MaxTime

MinTime MinTime MinTime MinTime

0H 15th M 30th M 45th M 1H 2H

Collects data

REPORTS

Collects data

REPORTS

Collects data

REPORTS

Collects data

REPORTS

Collects data

REPORTS

Collects data

Does not report

Example#3 based on MinTime = 15 Minutes, MaxTime= 1 Hour

MaxTime

MinTime MinTime MinTime MinTime MinTime MinTime

0H 15th M 30th M 45th M 1H 1H15thM1H30thM

7.Installation

The data obtained by the ultrasonic level sensor is the actual liquid height + the thickness of the bottom of the container.

The container material can be metal or plastic.

During the installation test, different test liquids (water, diesel, gasoline) can be configurated first.

7.1 Install the sensor at the bottom of the container / tank:

1. Power on first to see if the sensor is working normally.

The red light flashing on the sensor indicates that the sensor can work normally, as shown in the figure.

Collects data

REPORT

Collects data

Does not report

Collects data

REPORTS

Collects data

Does not report

Collects data

Does not report

Collects data

Does not report

Collects data

REPORT

The status changed

2. Place the container or tank in a horizontal position, preferably the angle between the container or tank and the horizontal plane

is less than 2 degrees.

3. Make sure the container / tank is full or at least 2/3 of the liquid.

4. Find best check-point for installing the sensor (the bottom of the container should be kept clean).

a. Apply some coupling gel on the sensor surface.

b. Place the sensor on the bottom of the container / tank; gently move to find the correct test point and draw a circle around

the test point.

5. Clean the checkpoint and the sensor surface, and prepare to fix the sensor to the container / tank.

6. Apply AB glue to the surface of the sensor, stick the sensor to the inspection point of the container / tank, and keep it for a

while until it is fixed.

7. If the installation is correct, the device reports the installation status in REPORT as 00, otherwise, it’s 01.

8. When the thickness of the bottom of the steel container is more than 8mm, or the thickness of the bottom of the glass or plastic

container is more than 10mm, the ultrasonic liquid level sensor can not measure normally.

9.The ultrasonic level sensor has high ultrasonic energy; therefore, when the measured liquid is water,

the water level must be higher than 50cm that can make the measured data reach 1% accuracy.

7.2 How to find the correct detection point

Check the reported installation information.

“0”means that it can be installed at this detection point

“1”means it cannot be installed at this detection point

When selecting the correct detection point, pay attention to the following points:

(1)Ensure that the working surface of the sensor is in a horizontal position, and the working surface is parallel to the liquid

level in the tank; the radiation axis of the sensor is perpendicular to the horizontal direction. As the picture shows in below:

(2)The 1, 2, and 4 points in below figure are not suitable for mounting sensors because they are too close to the tank wall or

have obstacles.

Point 5 is not suitable because it is not horizontal.

Position 3 is suitable for mounting the sensor.

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