Grad601 Single & Dual Sensor Magnetic Gradiometers
The Grad601-2 two-sensor version is designed for archaeological prospecting and allows geophysical surveys to be completed in about half the time. The large non-volatile flash memory and fast downloading of data offer improved survey efficiency.
The Grad601-1 single sensor version is ideal for both archaeological prospecting and the location of pipes, cables, drums and archaeological features.
These gradiometers have a linear range of 100nT with a resolution of 0.1nT and a range of 1000nT with a resolution of 1nT. A compressed response is provided to 30,000nT.
The exceptional temperature stability of the sensors ensures minimal drift during surveys and reduces the need for adjustment. All adjustments are accomplished automatically using a single pushbutton and audible cueing.
The Grad601-1 and Grad601-2 gradiometers are supplied complete with cables and accessories in a rugged carrying case. The Grad601-2 dual gradiometer includes an adjustable harness which completely relieves the operator’s arms whilst carrying the instrument.
- 1m vertical spacing for deep anomalies
- 1 or 2 sensor operation
- High stability and simple electronic adjustment
- Selectable 0.1nT or 1nT resolution
- Non-volatile flash memory for 125k readings
- 1, 2 or 4 lines/m for single or dual version
- 1 to 8 readings/m on each line with automatic averaging or single shot
- Low power – 24 hour operation from one charge
- Survey and Scan modes with audio output
- Battery unit has built-in charger and field replaceable battery
- Battery fuel gauge
- Variable survey pace
- Variable scan threshold
- Simple download operation – 6.5 mins max
- Selectable output format
- Simple 6-key operation
- 50/60Hz powerline rejection
The gradiometer operates either in survey mode, where data is logged whilst covering the site in parallel or zigzag paths, or in a scanning mode where it is used as a search tool with an audible output without data logging. The scanning mode is used to locate archaeological features, pipes, cables, waste drums and unexploded ordnance.