This product can perform coil excitation and measurement frequency work for single-coil vibrating wire sensor, and the module is transmitted through RS485 interface and responds to communication in accordance with MODBUS-RTU protocol. Equipped with a good human-computer interaction interface, easy to use and stable performance.
Application direction
How it works
The vibrating wire data acquisition module adopts 9-24V voltage pulse excitation, and the following two methods are used.
1. Progressive scanning frequency excitation
A series of frequency gradient excitation signals are emitted, and if the frequency to be measured is in or near it, it can be successfully excited relatively quickly.
2. Excite at a known frequency
The approximate frequency of the vibrating wire device at the moment has been measured or known, and the known frequency can be used for excitation, and the signal quality is better.
When the excitation signal is sent, if the excitation has been successfully excited, the vibrating wire signal is amplified and filtered to effectively feedback the interval between the two adjacent rising edges of the signal, that is, the period of the frequency signal to be measured, in order to improve the accuracy of frequency measurement, a plurality of rising edges can be measured and stored at the same time, and the average value of a plurality of consecutive trusted rising edges can be taken to effectively provide accuracy.
Technical advantages and technical parameters
1. Technical advantages
2. Technical parameters
Features:
1. RS485 bus protocol, Modbus-RTU standard protocol
Standard protocols and interfaces reduce the difficulty of development and adaptation, and the device comes with a host computer for easy debugging.
2. High-quality data collection
A variety of technical means are used to filter out invalid vibrating chord clutter to improve the acquisition accuracy.
3. Short-distance wiring
The shorter the wiring distance, the less external interference and the more stable the data.
This product will encapsulate the equipment waterproof, can be directly installed with the sensor into the water or pressure measuring hole, the equipment adopts RS485 wiring, the extension cable can be up to 500 meters, not affected by the outside world, effectively solve a series of problems caused by the cable is too low excitation voltage, too many external interference sources, can not read the vibration frequency, and can not excite the vibrating wire and a series of problems.
4. IP68 waterproof design, waterproof, dustproof and erosion-proof
Stainless steel machined one-piece shell, sealed seamlessly, resistant to harsh environments.
5. Compatible with many vibrating wire sensors
It can read most manufacturers' vibrating wire sensors, including piezometers, strain gauges, etc.