WSSFC-V1A is a cost-effective, single-axis vibration sensor designed for condition monitoring and preventive
maintenance applications. The piezo-electric accelerometer is available in ranges ±25g or 50g and features a flat
frequency response up to >10kHz. Its accelerometer feature a stable piezo-ceramic crystal in shear mode with low-
power electronics, sealed in a fully hermetic package. The Piezo Electric technology incorporated in the WSSCF-V1A
accelerometer has a proven track record for offering the reliable and long-term stable output required for condition
monitoring applications. The accelerometer is designed and qualified for machine health monitoring and has superior
Resolution, Dynamic Range, and Bandwidth to MEMS devices. Besides that, it can also measure the temperature at the
mounting point.
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.
For the principle operation of the V1A single-axis vibration sensor, please refer to
for typical applications.
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, alarm status...
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, alarm status...
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 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, 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.
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
for more details.
The sensor is powered by 2 x AA 1.5V batteries for many years of operation. We do recommend using Energizer L91
battery which is very popular and high performance. This battery has a capacity of up to 3500mAh with a working
temperature range from -40 to +60 oC. The instruction for installing the batteries is in
.
Figure 1. Battery Energizer L91
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 V1A Single-Axis Vibration Sensor
and its principle of operation?
1.1.1 What are the typical applications of this sensor?
1.1.2 When does the device send uplink messages?
To change the cycle of data sending, you can change the value of the parameter: CYCLIC_DATA_PERIOD (default
is 600 seconds).
The alarm thresholds can be changed via downlink or offline tools.
1.1.3 The important configuration parameters
1.1.4 What kind of battery is used for this sensor?
