Daviteq V1A Vibration Sensor

1. Overview

Daviteq V1A Vibration Sensor is a vibration sensing module that utilizes the Piezo acceleration sensor to measure the vibration with a frequency of up to 10 kHz 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 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. 

With a built-in ultra-low power microprocessor, it can compute and deliver multiple parameters like velocity RMS/Peak, acceleration RMS/peak, displacement RMS/pk-pk, frequency, temperature, crest factor...

The V1A can be integrated into the wireless transmitter from Daviteq such as Sub-GHz WS433, LoRaWAN WSLRW, and Sigfox WSSFC. The connection can be via a 2m cable with an M12 connector or integrated type (WS433 only).

The V1A is also powered by the batteries in the wireless transmitter.

2. Detail measurement principle and its specification

V1A utilizes the single-axis Piezo acceleration sensor to detect the vibration of the object with vibration from 8Hz to 11 kHz.

A built-in high-accuracy solid-state temperature sensor allows the V1A to measure the object's surface temperature.

The microprocessor will capture the raw signal of acceleration and temperature values at a very high speed, up to 290 kHz. With this high-resolution raw signal, it performs various calculations to deliver the high accurate outputs like:

Velocity RMS (mm/s)	Velocity Peak (mm/s)
Acceleration RMS (m/s2)	Acceleration Peak (m/s2)
Displacement RMS (um)	Displacement Peak-Peak (um)
Frequency of Highest amplitude vibration (Hz)	Surface Temperature (oC)

These outputs will be sent to the wireless transmitter with a digital signal.

V1A specification

Sensing technology	Hermetically Sealed, Piezo-Ceramic Crystal, Shear Mode
Acceleration Range & Shock Limit (g)	±25 or 50, 10,000
Frequency Response and Resonant (Hz)	2 .. 10,000, > 30000
Non-Linearity, Transverse Sensitivity	±2%FSO, < 5%
Temperature measuring and operating	-40°C .. +85°C, with accuracy: +/- 0.5 and resolution: 0.125
Sensor Material, rating, and mounting	304SUS, IP67, M6 Screw
Connector	M12-M 5-pin (Coding A) with 2m cable or Integral type
Parameter Measurement	Acceleration RMS & Peak Velocity RMS & Peak Displacement RMS & Peak Frequency & Temperature
Acceleration range and resolution	+/- 25G, 6.1 mg
Velocity range and resolution	0 .. 50 mm/s, 0.1mm/s
Displacement range and resolution	+/- 5000 um, 1 um
Frequency range and resolution	2 .. 10,000 Hz, 1 Hz

3. Calibration of the Daviteq V1A Vibration Sensor

The Daviteq V1A Vibration Sensor is calibrated at the factory. It is recommended the customer to re-calibrate the sensor every 12 months. Please contact us for calibration services.

Notes:
* The calibration and configuration can only be done when the V1A sensor is used with a Wireless transmitter like Sub-GHz (WS433-V1A) or LoRaWAN (WSLRW-V1A) or Sigfox (WSSFC-V1A).
* After that, use the offline tool or downlink to configure the A factor to the device.

4. Application notes for the Daviteq V1A Vibration Sensor

The Daviteq V1A Vibration Sensor together with a wireless transmitter to be used in the following cases:

• Measuring Single-axis vibration and/or surface temperature of Motor, Bearing, Pump, Fan, Gearbox, Rotary machine/equipment, or any object that has a vibration from 8 to 11,000 Hz.

Figure 1. The V1A sensor is mounted on a motor case.

5. Installation

5.1 Dimension Drawings

Figure 2. Dimension drawing of WS433-V1A-...

Figure 3. Dimension drawing of V1A module which is used for WSLRW or WSSFC

5.2 Mounting Position

Rule of thumb, the V1A will be installed at the place you want to measure the vibration and/or surface temperature.

Here are some recommendations for the installation of V1A on some typical equipment based on standard ISO 20816 (or ISO 10816).

Figure 4. Measuring points for pedestal bearings	Figure 5. Measuring points for housing-type bearings
Figure 6. Measuring points for small electrical machines	Figure 7. Measuring points for reciprocating engines close to the bearing locations

Figure 8. Measuring points for vertical machine sets

Figure 9. A pump system with 4 bearings and 5 positions of vibration monitoring

5.2 Mounting the sensor on the equipment's surface

The V1A sensor has the inner threads M6 and there is an M6 screw that comes with the sensor as standard.

There are 02 cases of mounting:

5.2.1 There are male threads or female threads at the place to mount the sensor:

• The V1A can be installed directly on the equipment's surface via an M6 screw or an adapter if the threads on the equipment are not M6. Please see the below figures.

Figure 10. There is inner threads M6 on the motor casing

Figure 11. Mount the sensor on the M6 screw

5.2.2 There are no male threads or female threads at the place to mount the sensor:

• If the drilling is allowed, please make a drilled hole and then tap the inner threads M6 on the surface of the equipment so that you can install the V1A directly on the surface of the equipment. Please see the below figure.

Figure 12. Drilling and tapping an inner threads M6 on motor casing

• if the drilling is NOT allowed, you can use the adhesive base (Item code: ACC-V1A-BASE-01) for mounting the V1A on the equipment. Please contact us for more information about this accessory.

Here are the steps to attach the adhesive base to the equipment's surface.

* Use sandpaper to remove the deposit or paint layer on the surface of the equipment;
* Clean the surface with alcohol;
* Mix 2-part of putty epoxy. Refer the instruction to mix 2-part of putty epoxy on the label of putty epoxy package.
* Apply the 2-part putty epoxy on the bottom surface of the base;
* Place the base on the surface;
* Use the leveling meter to level the surface of the base in 02 directions X and Y;

LEAVE IT COMPLETELY DRY AND HARDEN IN AT LEAST 24 HOURS

* Screw the M6 screw and install the sensor module.

Figure 13. Place the base with Epoxy on the equipment's surface	Figure 14. Leveling it in the X direction
Figure 15. Leveling it in the Y direction	Figure 16. Leave it dry for 24 hours before installing the sensor

Note: the adhesive base is for a flat surface only or a curved surface with a radius larger than 500mm.

5.3 Connect the M12 cable (for LoRaWAN of Sigfox Version)

 

Figure 13. Connect the M12 cable to the sensor module

6. Troubleshooting for the V1A Sensor

No.	Phenomena		Reason	Solutions
1	The wireless transmitter is still running and sending data, however, all the measurement parameters are not updated with new values	1.1	The connection between the V1A sensor and the wireless transmitter is broken!	For LoRaWAN or Sigfox version: check the M12 connector and the cable to see any abnormal or looseness.   For the WS433 version: check the looseness of connection between sensor and transmitter.
		1.2	The battery is almost draining off.	Check the battery status and replace it when necessary.
2	The measured values are not as expected	2.1	The installation is not correct or not suitable for the sensor design.	Please recheck the installation.
		2.2	The sensor is drifting.	Re-calibrate the sensor. Please contact us.
3	The reading values are very noisy even though there is no vibration.	3.1	The sensor V1A got a problem.	Please consult the manufacturer for a warranty or replacement.
4	From system: HW_Error = 1	4.1	The lost connection between the sensor V1A and the wireless transmitter	For LoRaWAN or Sigfox version: check the M12 connector and the cable to see any abnormal or looseness.   For the WS433 version: check the looseness of connection between sensor and transmitter.
		4.2	The sensor V1A got a problem.	Please consult the manufacturer for a warranty or replacement.

7. Maintenance of the V1A Vibration Sensor

• There are no moving parts or consumed parts in the V1A Vibration Sensor. Therefore there is no need to do maintenance.
• However, the sensor may be drifting over time. We do recommend customer to re-calibrate it every 12 months. Please follow the calibration procedure in this link.

8. Default configuration

The V1A Vibration Sensor has the default configuration. The user can change the configuration on the wireless transmitter so that the complete sensor (sensor + wireless) delivers the proper output values. Below are some configuration parameters that store in the flash memory of the wireless transmitter.

Description	Unit	Default	Format	Property	Comment
CONSTANT_A		1	Float	R/W	Constant a for calibrating the velocity RMS and thus calibrating the whole vibration sensor
ENB_DATAGRAM		1	Uint16	R/W	bit0: enable datagram 0 bit1: enable datagram 1 bit2: enable datagram 2
TEMPERATURE_OFFSET_X10	oC	0	int16	R/W	Offset adjustment for measured temperature value

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