The d4Plucker uses a proprietary algorithm to locate the resonant frequency within the range 500Hz to 6000Hz. An internal switch is used to select 3 different frequency ranges based on the type of instrument used.
Using the d-Reader it is possible to quickly read the transducer. Using the d1Logger or d4Logger it is possible to log data from 1 or 4 VW sensors over a 100 day duration.
Using d-Mesh it is possible to transmit data over an existing TCP/IP network using either Ethernet or WiFi. A unique digital ID is assigned to each d4Plucker.
The output signal from the d-Plucker is a digital RS485 signal (9600,8,N,1) with ASCII encoded Sensor_ID, Sensor_Type, Temp and period.
Readout can be made using YieldPoint’s low cost manual interrogation unit (d-Reader), with a backlit LCD. The Unit displays the Sensor_Type and Sensor_ID and outputs the temperature and VW data directly in oC and µs.
The d-Viewer Module provides USB connectivity so that the d-Plucker can be read with using a LapTop or Tablet (d-Tab) PC. If power is available a low cost NetBook computer can be transformed into a data-logger.
Automated Data Retrieval:
The d-Logger (32Mb of memory) can collect up to 10,000 readings from the d-Plucker over a period up to 1 year. Download to a PC is with a USB download cable (order separately).
Plug-and-Play networks of instruments can be created using YieldPoint’s d-Mesh technology. A low-cost d-Mesh node can connect 4 instruments to a TCP/IP network over Ethernet or WiFi. This solution saves time and money by transmitting data directly to an engineer’s desktop computer.
- Monitoring pillar stress changes using vibrating wire BPCs.
- Monitoring pillar stress changes using vibrating wire stressmeters.
- Monitoring strain in structural elements using welded vibrating wire strain gauges.
- Monitoring the loading of structural elements such as posts and pillars
- Monitoring piezometer arrays.
Measuring stress changes in a Secondary Rock Pillar
Measured stress changes by two orthogonal Borehole Pressure Cells installed in production hole for a secondary stope pillar. BPCs attached to d1Plucker ( red -longitudinal orientation, blue- transverse). Recorded with d-Logger data-logger.