USER GUIDE FOR SIGFOX ULTRASONIC LEVEL SENSOR WSSFC-ULC

THIS IS OBSOLETE MANUAL

Please access https://www.iot.daviteq.com/wireless-sensors for updated manual

WSSFC-ULC -MN-EN-01

DEC-2020

This document is applied for the following products

SKU	WSSFC-ULC	HW Ver.	1.1	FW Ver.	1.0
Item Code	WSSFC-ULC-9-01	Sigfox Ultrasonic Level Sensor for General Level/Distance Measurement, 30-600CMS, Internal antenna, Type AA battery 1.5VDC, IP68, RC2-RC4 zones
	WSSFC-ULC-8-01	Sigfox Ultrasonic Level Sensor for General Level/Distance Measurement, 30-600CMS, Internal antenna, Type AA battery 1.5VDC, IP68, RC1 zones

0. Configuration Check List

STEP 1: Select RC
1. Select RC zone using Modbus Configuration Cable	RC zones selection 1, 2, 4 is RCZ1, RCZ2, RCZ4  (refer to register address 270)
2. Select RC zone using button	Refer to the button configuration
STEP 2:  Check ID and PAC
Use Modbus Configuration Cable to read the ID and PAC values	Refer to register address 8 and 10 (DEC)
STEP 3:  Configure the sensor's operating parameters
Configure parameters like cycle send data, alarm, a, b,...	Refer to the configuration section using the Modbus Configuration Cable
STEP 4:  Add device to Backend Sigfox
refer to section 5.4 for details

1. Functions Change Log

HW Ver.	FW Ver.	Release Date	Functions Change
1.1	1.0	DEC-2020

2. Introduction

WSSFC-ULC is a Sigfox Ultrasonic Level Sensor to measure the level of liquid surface of water, oil... This level sensor utilises the ultrasonic technology to measure the surface of liquid, the principle is to measure the time of flight of the ultrasound pulse in the air environment. The ultrasound pulse will be ejected from ultrasonic transducer, go thru the air and reaching the surface of liquid, then reflected back to the ultrasonic transducer, the measuring circuit will measure the time of flight of the Pulse then calculate the distance from transducer to the surface. With Ultra-low Power design and smart firmware allow the sensor can last up to 10 years with 02 x AA-type batteries (depends on configuration). WSSFC-ULC can support all regions of Sigfox network in over the World, RC1, RC2, RC4.

3. Specification

Sensor SPECIFICATION:
Sensor	Ultrasonic sensor
Measurement range	280 .. 7500 mm
Resolution	±5.0mm
Accuracy	±10 mm + S*0.3% (with S is the measured value)
Sensor sampling rate	configurable from 10s up to 3600s
Alarm setting	setting the alarm threshold for calculated value
Sigfox SPECIFICATION:
Sigfox zones	select RC2-RC4 or RC1
Antenna	Internal Antenna 2dbi
Battery	02 x AA Type 1.5VDC, working time up to 10 years (depends on configuration)
RF Module complies to	CE, FCC, ARIB
Working temperature	-15°C..+60°C (with AA L91 Energizer)
Dimensions	H180xW50xD40
Net-weight	250 grams
Housing	Polycarbonate & POM plastic, IP68

4. Dimensions

5. Operation Principle

Upon power on, the Sigfox node has 60 seconds to wait for off-line configuration (via cable with ModbusRTU protocol).

After that, Sigfox node will send the first message to Base station.

Then during the operation, there are 03 cases of sending data to base station:

1. When the sensor sampling time interval is reached, the Sigfox node will read the data from Input or sensor and performing the calculation. After that it will check calculated value with alarm thresholds. If the calculated was out off the threshold values (Lo or Hi), called alarm, and the number of times of alarm did not pass the limit of number of alarms, then it will send data to Base station immediately;

NOTE: 

Once sending the data to base station by this alarm event, the timer of sending time interval will be reset;

2. When the sending time interval is reached, it will send data to Base station immediately, regardless of value;

3. By using the magnet key, the Sigfox node can be triggered to send data to base station immediately. There will be a beep sound from the buzzer meaning the data has been sent.

NOTE:

Once sending the data to base station by the magnet key, the timer of sending time interval will be reset;

The shortest time interval between the two manual triggers is 15s. if shorter than 15s, there will be no data sending and you will not hear the beep sound.

5.1 LED meaning

• RC1: RED colour
• RC2: GREEN colour
• RC4: BLUE colour

5.2 Button Function

the push button can only be used for the first 60 seconds after powering up.

5.2.1 Menu configuration

There are 3 configuration menus: tx_repeat, downlink_flag, radio configuration.

We use the button to enter the menus as follows:

5.2.1.1 tx_repeat

Press and hold the button 2s  ->  When the Red LED is on, it means entering the tx_repeat configuration menu. Then release to configure it.

Press to configure. After pressing if the Red LED flashes once, tx_repeat = 0 (send 1 time). After pressing if the Red LED blinks twice, it is tx_repeat = 1 (send 3 times).

5.2.1.1 downlink_flag

Press and hold the button 5s  ->  When the Green LED is on, it means entering the downlink_flag configuration menu. Then release to configure it.

Press to configure. After pressing if the Green LED flashes once, it is downlink_flag = 0 (downlink is not allowed). After pressing if the Red LED blinks twice, it is downlink_flag = 1 (downlink is allowed).

5.2.1.1 radio configuration

Press and hold the button 10s  ->  Blue LED is on, it means entering the Radio Configuration menu. Then release to configure it.

Press to configure. After pressing if the Blue LED blinks once, it is Radio Configuration = 1. After pressing if the Blue LED flashes twice, it is Radio Configuration = 2. After pressing if the Blue LED flashes 4 times, it is Radio Configuration = 4.

5.2.2 Exit the menu:

There are 3 ways to exit the menu:

• Press and hold for 3s, the LED turns off to exit the menu;
• Wait 30 seconds, then exit the menu;
• Take out the battery, it all starts over (outside the menu)).

5.3 RC technical details

The RF transmit power will be automatically set as the max value as allowed by the Zone.

Sigfox Radio Configuration (RC) defines the radio parameters in which the device shall operate: Sigfox operating frequencies, output power, spectrum access mechanism, throughput, coexistence with other radio technologies, etc.

Each radio configuration includes 4 uplink classes: 0u, 1u, 2u, and 3u.

The Sigfox network globally works within the ranges from 862 to 928 MHz. But not all RCs require such a wide range of operation.

	RC1	RC2	RC4
Uplink center frequency (MHz)	868.130	902.200	920.800
Downlink center frequency (MHz)	869.525	905.200	922.300
Uplink data rate (bit/s)	100	600	600
Downlink data rate (bit/s)	600	600	600
Sigfox recommended EIRP (dBm)	16	24	24
Specifics	Duty cycle 1% *	Frequency hopping **	Frequency hopping **

* Duty cycle is 1% of the time per hour (36 seconds). For an 8 to 12 bytes payload, this means 6 messages per hour, 140 per day.

** Frequency hopping: The device broadcasts each message 3 times on 3 different frequencies. Maximum On time 400 ms per channel. No new emission before 20 s.

*** Listen Before Talk: Devices must verify that the Sigfox-operated 200 kHz channel is free of any signal stronger than −80 dBm before transmitting. 

Sigfox’s high limit EIRP recommendation is included in each column although regulations sometimes allow for more radiated power than the Sigfox recommendation.

Sigfox’s recommendation is set to comply with the Sigfox technological approach of:

5.4 Add a device to the Backend Sigfox

Step 1: Log in to the sigfox backend website

Step 2: Click on Device

Step 3: Click New → Select a group

Step 4: Fill in the required information

Note: Some of our products may not have end product certification in time, to add the product to Backend Sigfox please follow the steps below.

Click on the text as shown below

Check the box as shown below to register as a prototype

5.5 The Effective Detection Range

5.6 Process of measurement

5.6.1 Measurement principle of Sigfox Sensor

When the sensor sampling time interval is reached, for example 2 minutes, the Sigfox node will wake up and switch ON the power supply to supply the energy to external sensor to start the measurement. Depends on the type and characteristic of external sensor, the sensor will take a certain time to finish the measurement.

Once reading the value, it can be scaled to any engineering value by the following formula:

Y = aX + b

Where:

• • • X: the raw value from sensor
    • Y: the calculated value will be sent to Sigfox base station in the payload data.
    • a: constant (default value is 1)
    • b: constant (default value is 0)

So, if there is no user setting for a and b ==> Y = X

The Y value will be compared with Lo and Hi threshold. Please refer below the graph of alarm processing.

5.6.2 Calibration

Figure – Ultrasonic Level Transmitter Calibration

• DB: Dead band 0..280 mm (This is a short range in front of the ultrasonic sensor can not measure distances)
• H: Maximum measuring distance ( Span )
• D: Distance

For example: Water tank with maximum height to be measured 3000mm (H) and Dead band (DB) is 280 mm, then:

From here we can look up the water level corresponding to the measured distance of the sensor by the formula: Y = aX + b.

Where: X is the measured distance (mm) and Y is the level (‰)

Distance (mm)	Level (‰)
280	1000
500	919
1000	735
1500	552
2000	368
2500	184
3000	0

Use the offline configuration tool to configure sigfox sensor. Write in the sensor the parameters a and b.

Refer to section 6 for more details.

5.7 Payload Data

Sensor type (1 byte)

Status (1 byte)

1 st - Parameter (2 bytes)

2nd - Parameter (2 bytes)

6. Offline configuration

Using the configuration cable to connect to the sensor as below picture.

Serial port configuration on computer: 9600 baud, None parity, 1 stop bit.

Reading data by Function 3.

Writing data by Function 16.

During connection with Modbus configuration tool, the Sigfox node will send all data in realtime: Battery, Battery level, Vref, Button status, reed switch status, PCB temperature, Measured value, alarm status.

Step to configure & check data:

NOTE:

The Modbus configuration can be done in the first 60s after power up the Sigfox node. After 60s, if user can not finish the configuration, user need to reset the power of Sigfox node again, by removing battery in at least 15s.

Step 1: Install the Modbus Configurator Software in the link below

https://filerun.daviteq.com/wl/?id=qK0PGNbY1g1fuxTqbFW9SXtEvCw7bpc6

How to use the Modbus configuration software 

Step 2: Plug the configuration cable to Computer via USB port;

 

 

Step 3: Open the housing;

Step 4: Plug the connector to the configuration port;

Step 5:  Import the configuration file by importing the csv file: Go to MENU: FILE / Import New / => select the file with name CONFIGURATION TEMPLATE FILE FOR SIGFOX WSSFC-ULC.csv (in the link below). Then click Connect;

CONFIGURATION TEMPLATE FILE FOR SIGFOX WSSFC-ULC.csv

Here is the table of Data will be read by Modbus tool

Here is the table for Configuration:

7. Installation

7.1 Locate the good place for Radio signal

To maximize the distance of transmission, the ideal condition is Line-of-sight (LOS) between the Sigfox sensor and Base station. In real life, there may be no LOS condition. However, the Sigfox sensor still communicate with Base station, but the distance will be reduced significantly.

ATTENTION:

DO NOT install the Sigfox sensor or its antenna inside a completed metallic box or housing, because RF signal can not pass through metallic wall. The housing is made from Non-metallic materials like plastic, glass, wood, leather, concrete, cement…is acceptable.

7.2 Process mounting

WARNINGS:

1. Please make sure the fluid is suitable with the wetted materials of the sensor. Please refer sensor specification;
2. Please make sure that the operating ambient temperature is right for the sensor. Please refer to the sensor's specifications;
3. Prepare the professional tools for installation. The inappropriate tools may cause damage to the sensor.

7.2.1 Mounting direct on the tank

 

7.2.2 Mounting on wall or pole

7.3 Battery installation

ENERGIZER L91 (recommended battery)

Steps for battery installation:

Step 1: Using L hex key to unscrew M4 screws at the side of the housing and carefully pull out the top plastic housing in the vertical direction

Step 2: Insert 02 x AA 1.5VDC battery, please take note the poles of the battery

ATTENTION:

REVERSED POLARITY OF BATTERIES IN 10 SECONDS CAN DAMAGE THE SENSOR CIRCUIT!!!

Step 3: Insert the top plastic housing and locking by L hex key

ATTENTION:

When reinstalling the cover, pay attention to put the PCB edge into the middle slot of the box inside as shown below)

8. Troubleshooting

No.	Phenomena	Reason	Solutions
1	Node does not send RF to base station periodically, LED does not blink	No power supply Configuration sending cycle is incorrect	Check that the battery is empty or not installed correctly Check the power supply Check the send cycle configuration
2	Node does not send RF to base station according to the alarm, LED does not blink	The alarm configuration is incorrect Running out of the number of alarms set for the day	Check alarm configuration Check the configuration for the maximum number of alarms per day
3	Node does not send RF to base station when activated by the magnetic switch, LED does not blink	Magnetic switch has malfunctioned	Read the status of the magnetic switch via modbus (when powering or attaching the battery) to see if the magnetic switch is working.
4	Node has blinked LED when sending RF but the base station cannot received	Out of the number of RF packages per day (140 packages / day)	Check on the base station whether the event message exceeds the number of RF packets
5	Node has sent RF but the LED does not blink	LED malfunction LED welding is not good	Check LED condition and LED weld
6	The value of the sensor is 0	No pressure Lost connection with the sensor	Check pipe pressure Check sensor connection
7	The node does not send RF and the RF module is hot	Insert the battery in the opposite direction Short circuit	Warranty or replacement
8	RSSI is weak and often loses data	Distance between Node and Gateway is far or there are many obstructions Connection to Antenna problem	Check Antenna position Install Node in a well ventilated location

9. Support contacts

Manufacturer Daviteq Technologies Inc No.11 Street 2G, Nam Hung Vuong Res., An Lac Ward, Binh Tan Dist., Ho Chi Minh City, Vietnam. Tel: +84-28-6268.2523/4 (ext.122) Email: info@daviteq.com | www.daviteq.com	Distributor in Australia and New Zealand Templogger Pty Ltd Tel: 1800 LOGGER Email: contact@templogger.net