Inclinometer Casings
Settlement Magnet Ring
The AT-88 series settlement magnet ring is the target component in a settlement measurement system. The housing is injection moulded with magnetic material built in and is compatible with a settlement meter probe. AT-8801 and AT-8802 both suit 53 mm and 70 mm casing and are installed either by borehole drilling or by the filling method.
ISO 9001:2015 production Samples available Small orders accepted
Product Overview
The AT-88 series settlement magnet ring is the target component in a settlement measurement system. The housing is injection moulded with magnetic material built in and is compatible with a settlement meter probe. AT-8801 and AT-8802 both suit 53 mm and 70 mm casing and are installed either by borehole drilling or by the filling method.
Materials
- Injection moulded housing
- Built-in magnetic material
Key Benefits
- Injection moulded housing with the magnet built in, so nothing has to be assembled on site
- Matches 53 mm and 70 mm casing, the same sizes as our piezometer and inclinometer casing
- Two outer diameter options for borehole and fill installations
- Compatible with settlement meter probes for repeatable depth readings
- Passive component with nothing to power or calibrate
Application Scenarios And Who It Is For
Application Scenarios
- Settlement monitoring of embankments and fills
- Layered settlement measurement in soft ground
- Monitoring settlement under preloading and surcharge
- Long-term settlement records on road and railway subgrade
Who It Is For
- Earthworks contractors monitoring fill settlement
- Geotechnical consultants designing settlement arrays
- Road and railway subgrade monitoring teams
- Ground improvement contractors verifying preload performance
Problems It Solves
- Settlement recorded only at the surface with no layer by layer breakdown
- Rings that do not match the casing already specified for the site
- Site-assembled targets that move or lose the magnet during backfill
- Choosing between drilled and filled installation with one part family
Technical Features
- Injection moulded housing with built-in magnetic material
- Compatible with the settlement meter probe
- AT-8801 outer diameter 91 mm and 110 mm options
- AT-8802 outer diameter 200 mm
- Inner diameter 55 mm and 72 mm on both models
- Matched casing diameters 53 mm and 70 mm
Specifications
Values below are taken from our published product data. Our tables note that figures are general averages for reference and that actual data should be confirmed by testing within the applicable scope.
| Models | AT-8801 and AT-8802 in the AT-88 series |
|---|---|
| Casing Diameter Matched | 53 mm and 70 mm |
| Outer Diameter AT-8801 | 91 mm and 110 mm |
| Outer Diameter AT-8802 | 200 mm |
| Inner Diameter | 55 mm and 72 mm |
| Installation | By borehole drilling or by filling method |
Quality Control
- Inner and outer diameters checked against the model specification
- Magnet position and strength checked for probe detection
- Housing integrity checked for backfill loading
- Matched against the ordered casing diameter before shipment
Customization Options
- Model selection by installation method and casing diameter
- Supply together with matched settlement casing
Comparison With Other Products
| Compared With | Why This Product |
|---|---|
| Surface settlement plates | Magnet rings record settlement at each layer rather than one figure at the surface |
| Vibrating wire settlement sensors | The magnet ring is a passive target read by probe, with no cable or electronics in the ground |
Use Guide
- Select the ring outer diameter to match the drilled hole or fill installation
- Thread the ring over the settlement casing at the design level
- Backfill carefully so the ring stays at its recorded elevation
- Record each ring level at installation as the baseline for future readings
Questions Buyers Ask
Settlement Magnet Ring FAQ
What casing sizes do the rings fit
Both models are matched to 53 mm and 70 mm casing, with inner diameters of 55 mm and 72 mm.
What is the difference between AT-8801 and AT-8802
Outer diameter. AT-8801 is available at 91 mm and 110 mm, AT-8802 at 200 mm, which suits filling method installation in coarser fill.
How are the rings installed
By borehole drilling or by the filling method, depending on the project.
Do they need calibration
No. The ring is a passive magnetic target read by the settlement meter probe.
Do you supply the settlement casing too
Yes. Tell us your casing diameter and we will quote rings and casing together.
Are the rings compatible with our existing probe
The housing is designed to be compatible with settlement meter probes. Send your probe model on WhatsApp and we will confirm.
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