Manual for Sigfox-Ready Exd Approved Flammable Gas Sensor - WSSFCEX-GHC | FW2
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This manual is applied to the following products
| Item code | HW Version | Firmware Version | Remarks |
| WSSFCEX-GHC-01 | 1 | 2 |
Product Features
| Connectivity Type | Sigfox |
| Product Type | 1 part |
| Mounting Type | Wall mount |
| Powered by | 1 x C battery LiSOCl2, recommend SAFT LS26500 |
Information Changes in this version v.s the previous version
| Item | Changes | Changed by | Changed Date | Approved by | Approved Date |
| 1 | Initial version | D.Q.Tuan | 29-10-2022 | N.V.Loc | 31-10-2022 |
To use this product, please refer step by step to the below instructions.
1. Quick Guide
Reading time: 10 minutes
Finish this part so you can understand and put the sensor in operation with the default configuration from the factory.
1.1 What is the Sigfox-Ready GHC Flammable Gas Sensor and its principle of operation?
WSSFCEX-GHC is a Sigfox-Ready sensor with Ex d explosion-proof approve and comes with a built-in high-performance NDIR technology sensor to detect the Hydrocarbon Gas concentration in the air. Ultra-low-power design and smart firmware allow the complete Wireless and Sensor package to run on a single battery type C for 3-5 years or more with 15 minutes update.
It is battery-operated and able to connect to any Sigfox network in the World. It supports all frequency zones such as RC1, RC2, RC3c, RC4, RC5, RC6, and RC7.
Please refer to this link for the flammable gas sensor's principal operation.
1.1.1 What are the typical applications of this sensor?
Please refer to this link for typical applications.
1.1.2 When does the device send uplink messages?
The device will send uplink messages in the following cases:
- Case 1: After power-up in the 60s, the device will send the first message called START_UP. The payload will tell the user the HW version, FW version, and current configuration of the device;
- Case 2: Then, in every interval time (pre-configured), for example, 10 minutes, it will send the message called CYCLIC_DATA. The payload will tell the user the following data like measured values, battery level, and alarm status...
To change the cycle of data sending, you can change the value of the parameter: CYCLIC_DATA_PERIOD (default is 600 seconds).
- Case 3: If the Alarm function was enabled (in the configuration of the sensor), if the measured value passed the threshold, it will send the uplink message immediately. This message is called ALARM. The payload also tells the user the data like measured values, battery level, and alarm status...
The alarm thresholds can be changed via downlink or offline tools.
- Case 4: The HEART_BEAT uplink message will be sent once a day (the default setting can be changed in configuration) to allow the Sigfox back-end system can send the downlink message for changing the configuration of the sensor. Please refer to the downlink section for more details. The uplink payload will tell the user the HW version, FW version, and current configuration of the device;
- Case 5: During the commissioning, testing, or calibration sensor, the user can force the device to send the uplink message to get the data immediately. This message is called FORCE_DATA. The payload will provide data like raw measured value, scaled measured value, battery level, and alarm status... It can be forced by applying the magnet key on the reed switch in 1s;
- Case 6: If users want to change the configuration immediately, they don't need to wait up to 1 day for the HEART_BEAT message, instead they can force the device to send a special uplink message so that the device can get the new downlink message. This uplink message is named PARAMETERS_UPDATE. It can be forced by applying the magnet key in more than 5s.
1.1.3 The important configuration parameters
The sensor was pre-configured at the factory with default values for configuration parameters that meet most use cases. However, depending on the specific use case, the customer can adjust those parameters. Please refer to section 3.2 for more details.
1.1.4 What kind of battery is used for this sensor?
The sensor is powered by 1 x Type C battery 3.6V LiSOCl2 for many years of operation. We do recommend using Saft LS26500 battery which is suitable for Exd-approved instruments. This battery has a capacity of up to 7700mAh with a working temperature range from -40 to +85 oC. The instruction for installing the batteries is in this link.
Note: The battery can be inserted into the device in the Safe Zone only!!!
Figure 1. Battery SAFT LS26500
For Battery life estimation, please refer to this link.
1.2 What's in the package?
The package includes the following items:
01 x Main device
01 x Magnet key
01 x Antenna Type N connector
Figure 2. Product package of WSSFCEX-GHC-01
1.3 Quick Test
With the default configuration, the device can be connected quickly to the Sigfox Network by the following steps.
Step 1: Prepare the values of communication settings:
|
Device ID |
Get Devive ID on the device nameplate |
|
Device PAC |
Get Devive PAC on the device nameplate |
Note: All Sigfox sensors are pre-configured with the correct RC before delivery. The settings of Device ID, Device PAC, and RC could also be read from the device memory map. Please reference section 3.2 Sensor configuration for details.
Step 2: Add the device to Sigfox Backend
Please refer to this link for details
Step 3: Install the batteries to the device
Please refer to this link for instructions on battery installation.
After installing the battery in 60 seconds, the first data packet will be sent to the Sigfox network. After receiving the first data packet, the time of another packet depends on the value of the parameter: CYCLIC_DATA_PERIOD. Additionally, you can use a Magnet Key to force the device to send data instantly.
Step 4: Decode the payload of receiving package
Please refer to section 1.4 Uplink Payload and Data Decoding for details of decoding the receiving packet to get the measured values.
1.4 Uplink Payload and Data Decoding
For the Uplink Payload structure, please refer to sections B and C in this link.
1.5 Sensor Installation
1.5.1 Dimension drawings
Figure 3. Dimensions
1.5.2 Device calibration & configuration
If Configuration and Calibration are needed for the device, please perform those tasks in the Safe zone, before installing the device at the site.
Please refer to this link.
1.5.3 Installation
The Sigfox-Ready GHC flammable gas sensor is a wireless device with an integrated gas sensor to detect combustible gas.
1.5.3.1 Preparation before installing the device at the site location:
- Insert the batteries into the device in Safe Zone;
ATTENTION: REVERSED POLARITY OF BATTERIES IN 10 SECONDS CAN DAMAGE THE SENSOR CIRCUIT!!!
- Make sure the device run and connect to the Sigfox Network successfully;
1.5.3.2 Installing the device at the actual location as below steps:
- Locate the place to detect the target gas. Please follow this link;
- Make sure the site is good enough for RF signal transmission. Please take notes as in this link;
- Mount the sensor onto a wall by two screws as this link;
Note: DO NOT OPEN THE DEVICE OR REPLACING BATTERY DURING INSTALLATION AT SITE (HAZARDOUS AREA ZONE 0, 1, 2)
2. Maintenance
2.1 Troubleshooting
- Problems with Sigfox communication like not receiving the packets...please refer to this link to troubleshoot the device.
- Problems with the sensor functions like not measuring or inaccurate measuring....please refer to this link to troubleshoot the sensor part.
2.2 Device maintenance
2.2.1 Maintenance for Wireless transmitter
| Maintenance works | Yes/No |
Descriptions |
| Consumable parts replacement | Yes |
The battery is the only part need to check the lifetime to replace. Check the battery status on the back-end system. |
| Cleaning device | No |
|
2.2.2 Maintenance for GHC sensor module
Please refer to this link.
3. Advanced Guide
3.1 Operating principle of the Sigfox-Ready GHC Flammable Gas Sensor
3.1.1 Operating principle of the complete device
The Daviteq Sigfox-Ready GHC Flammable Gas Sensor comprises 02 parts connected together:
- The Daviteq Sigfox-Ready wireless transmitter
- The Daviteq GHC flammable sensor module
Figure 4. Complete set of WSSFCEX-GHC flammable gas sensor
The GHC flammable gas sensor measures the flammable gas concentration of the surrounding air.
The Sigfox-Ready wireless transmitter is to read the measurement values from the GHC sensor and performs the scaling and calculation to deliver accurate outputs.
3.1.2 Operating principle of GHC flammable gas sensor
To understand how the GHC flammable gas sensor works, please refer to this link for a complete understanding of this measuring technique.
3.1.3 Some important configuration parameters
Below are some important configuration parameters which affect the operation of the device like battery life, measurement accuracy, and alert threshold.
For Battery life estimation, please refer to this link.
- measure_period | Default = 300s
This is the time period for the wireless transmitter to wake up and take the measurement from the transducer. The default value is 3600s. Users can reduce this value, but smaller value, shorter battery life! - cyclic_data_period | Default = 1800s
Interval time to send an uplink message regardless of any conditions - sensor_response_time | Default = 100s
This value will affect the measurement accuracy. DO NOT change this value!
Those configuration parameters can be changed by downlink or offline tools. For other configuration parameters, please refer to the next section.
3.2 Sensor Configuration
3.2.1 How to configure the Sigfox-Ready GHC flammable gas sensor?
Sensor configuration can be configured in 02 methods:
- Method 1: Configuring via Downlink message. Please find the instructions in sections D and E in this link, but please take note of the FW version of the Document.
- Method 2: Configuring via offline cable.
Note: THE SENSOR IS ONLY ACTIVE FOR OFFLINE CONFIGURATION IN THE FIRST 60 SINCE POWER UP BY BATTERY OR PLUGGING THE CONFIGURATION CABLE.
3.2.2 What parameters of the device are configured?
- Some parameters are read-only, and some are read and writeable.
- To read the parameters, use the off-line cable as per the above instruction.
- Via uplink message, users can read only one parameter, which is the CURRENT_CONFIGURATION.
The below tables are the lists of the parameters of the device.
Read-only Parameter Table
|
Modbus Register (Decimal) |
Modbus Register (Hex) |
Function Code (Read) |
No. of Registers |
Description |
Range |
Format |
Property |
Comment |
|
2 |
2 |
3 |
4 |
FW_VERSION |
|
string |
Read |
|
|
6 |
6 |
3 |
2 |
HW_VERSION |
|
string |
Read |
|
|
8 |
8 |
3 |
2 |
DEVICE_ID |
|
hex |
Read |
Product ID |
|
10 |
A |
3 |
4 |
DEVICE_PAC |
|
hex |
Read |
Product PAC |
|
14 |
E |
3 |
1 |
SENSOR_TYPE |
1-255 |
uint16 |
Read |
Sensor or Input Type |
Read/Write Parameter Table
|
Modbus Register (Decimal) |
Modbus Register (Hex) |
Function Code (Read) |
Function Code (Write) |
No. of Registers |
Description |
Range |
Default |
Format |
Property |
Comment |
|
270 |
10E |
3 |
16 |
4 |
CURRENT_CONFIGURATION |
|
|
hex |
Read/Write |
Check sections D & E in this |
|
274 |
112 |
3 |
16 |
1 |
SERVER_CONFIG |
|
0 |
uint16 |
Read/Write |
0: Send to Sigfox Network 1: Send to Dongle |
|
276 |
114 |
3 |
16 |
1 |
RADIO_CONFIG |
1-4 |
4 |
uint16 |
Read/Write |
RC zones selection 1, 2 , 3, 4 is RC1, RC2, RC3s, RC4 |
|
277 |
115 |
3 |
16 |
1 |
TX_POWER |
|
20 |
int16 |
Read/Write |
RF Tx power |
|
278 |
116 |
3 |
16 |
2 |
CONSTANT_A |
|
1 |
float |
Read/Write |
Constant a for scaling measured value. This value would be changed after calibration. |
| 280 | 118 | 3 | 16 | 2 | CONSTANT_B | 0 | float |
Read/Write |
Constant b for scaling measured value.This value would be changed after calibration. |
|
| 306 | 132 | 3 | 16 | 1 | SENSOR_RESPONSE_TIME | 100 | uint16 | Read/Write | Sensor response time, in second | |
| 307 | 133 | 3 | 16 | 2 | C_H_FACTOR | 4.4 | float | Read/Write | For methane C(h) = 4.4% vol; for propane C(h) = 1.7% vol |
3.3 Calibration for Sigfox-Ready GHC Flammable Gas Sensor
Please refer to this link.
4. Product specification
Please refer to the detailed specifications in this link.
5. Warranty and Support
For warranty terms and support procedures, please refer to this link.
6. References
Use-cases:
Case studies:
White-papers:
END.
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