Description
Model SJ-7000 magnetic probe extensometer is designed to measure settlement or heave through movement of probe in PVC access pipe. Ring magnet and Spider magnets and magnet plate are installed at PVC access pipe and borehole. Probe sense magnetic position. If probe reach spider magnet, LED lamp is “ON” and buzzer rings. When signal is “On”, operator measure millimeter graduation in tape.
Ring magnet at the bottom of access pipe and immovable layer and insert spider magnets at planning depths. Reed switch is installed in probe and, if probe sense magnet filed during probe is lifted down, reed switch close and buzzer and LED lamp is operated automatically.
Specification
| Magnetic probe and reel | SJ-7000 | SJ-7010 | ||
|---|---|---|---|---|
| Measurement range | 50 meter | 100 meter | ||
| Probe dimension | Ø19 X 180mm | |||
| Tape Accuracy | 1mm | |||
| Resolution | ±1mm | |||
| Spider magnet | SJ-7130 | SJ-7140 | SJ-7160 | SJ-7170 |
| Diameter | Ø30 (for PVC pipe) | Ø40 (for PVC pipe) | Ø60 (for inclinomter casing) | Ø70 (for inclinomter casing) |
| Ring magnet (Datum magnet) | SJ-7230 | SJ-7240 | SJ-7260 | SJ-7270 |
| Diameter | Ø30 (for PVC pipe) | Ø40 (for PVC pipe) | Ø60 (for inclinomter casing) | Ø70 (for inclinomter casing) |
| Magnet plate | SJ-7330 | SJ-7340 | SJ-7360 | SJ-7370 |
| Diameter | Ø30 (for PVC pipe) | Ø40 (for PVC pipe) | Ø60 (for inclinomter casing) | Ø70 (for inclinomter casing) |
Installation
- Operator shall fix datum magnet (ring magnet) by screw nail or clamp the above 50cm from the
bottom of PVC access pipe (or inclinometer casing). - Operator fix datum magnet at the steady layer as like rock and install spider magnet by
installationrod or leg at the plaining depth step by step. - Size of magnetic sensors depend on diameter of borehole, and datum magnet is smaller
thanborehole and spider magnetic including spider leg is bigger than diameter of borehole to
protect slip. - Operator insert tremie pipe or grout pipe into borehole and grout borehole from bottom by pump
and grout borehole from bottom by pump. - Operator shall install magnetic spider to has enough space from coupling for protection
that magnetic sensors are caught by coupling during settling.
Operation of magnetic extensometer indicator ④
Our magnetic extensometer indicator can be used for magnetic extensometer and water level meter.
- ① Operation switch: If the operator pushes the switch to No.1 direction, this indicator can be used for the water level meter.
- If the operator pushes the switch to No.1 direction and the probe touches water, the green light ② turns “On” and the buzzer sounds.
- If the operator pushes the switch to No.2 direction, this indicator can be used for the magnetic extensometer.
- If the operator pushes the switch to No.2 direction and the probe reaches magnetic, the yellow light ③ turns “On” and the buzzer sounds.
- When the battery runs out of power, if the operator releases screws ④, the operator can exchange the battery (9 volt).