Topcon 24x Auto Level Survey Instrument - Waterproof, Magnetic-Damping, Reliable China Suppliers & Factory
Rapid, Stable, Durable Compensator
The compensator of AT-B Series incorporates four suspension wires made of super-high-tensile metal, which features minimal thermal expansion coefficient - providing unmatched durability and accuracy.
The finely tuned magnetic damping system quickly levels and stabilizes the line-of-sight despite the fine vibrations present when working near heavy equipment or busy roadways.
Horizontal Circle For Measurement
Horizontal angles can be directly read in 1° or 1 gon units. The free rotation feature allows you to read any angle from zero.
The circle is covered for protection against dirt and scratches and the readout window is located below the eyepiece for quick reference.
20 cm - Short Minimum Focus
The AT-B Series can focus on objects 20 cm in front of the telescope. This feature dramatically facilitates working in confined spaces.
All-weather Dependability
With the IPX6 rating, the instrument is protected against powerful water jets from all directions, meaning the AT-B Series withstands a sudden shower or torrential rainfall. The advanced protection design also deters clouding or condensation inside the telescope.
There are three models available depending on your accuracy requirements:
- AT-B4: 24x, 2.0mm accuracy.
- AT-B3: 28x, 1.5mm accuracy.
- AT-B2: 32x magnification (40x optional), 0.7mm accuracy (0.5mm with an optional micrometer).
Specification
| Telescope | AT-B2 | AT-B3 | AT-B4 |
|---|---|---|---|
| Length | 215mm (8.46 in) | 215mm (8.46 in) | 215mm (8.46 in) |
| Magnification | 32X | 28X | 24X |
| Objective Aperture | 42mm (1.65 in.) | 36mm (1.42 in.) | 32mm (1.26 in.) |
| Resolving Power | 3 in | 3.5 in | 4.0 in |
| Field of View | 1°20' | 1°25' | 1°25' |
| At 100m/328ft | 2.3m(7.5ft) | 2.5m(8.2ft) | 2.5m(8.2ft) |
| Min. Focus from end of telescope | 0.2m(7.9 in) | 0.2m(7.9 in) | 0.2m(7.9 in) |
| Min. Focus from instrument center | 0.3m (1ft) | 0.3m (1ft) | 0.3m (1ft) |
| Image | Erect | Erect | Erect |
| Stadia constant | 0 | 0 | 0 |
| Stadia ratio | 100 | 100 | 100 |
| Focusing Knob | 2-speed | 1-speed | 1-speed |
| Sighting Aid | Peep sight | Gun Sight | Gun Sight |
| ACCURACY (1 km double run leveling) | |||
| Without Micrometer | 0.7mm(0.03 in) | 1.5mm(0.06 in) | 2.0mm(0.08 in) |
| With micrometer | 0.5mm(0.02in) | N/A | N/A |
| Compensator | |||
| Type | Pendulum compensator with magnetic damping system | ||
| Setting Accuracy | 0.3 in. | 0.5 in. | 0.5 in. |
| Working Range | ±15' | ±15' | ±15' |
| CIRCULAR LEVEL | |||
| Sensitivity | 10'/ 2mm | 10'/ 2mm | 10'/ 2mm |
| HORIZONTAL CIRCLE | |||
| Diameter | 103mm(4.1 in) | 103mm(4.1 in) | 103mm(4.1 in) |
| Minimum division | 1°/1gon | 1°/1gon | 1°/1gon |
| General | |||
| Water resistance | IPX6 (IEC 60529: 2001) | ||
| Operating temperature | -4°F~+122°F (-20ºC~+50ºC) | ||
Frequently Asked Questions
What makes the compensator of the AT-B Series highly durable and accurate?
The compensator incorporates four suspension wires made of super-high-tensile metal that features a minimal thermal expansion coefficient. It also includes a finely tuned magnetic damping system that quickly levels and stabilizes the line-of-sight against vibrations from nearby heavy equipment or roadways.
How do the models AT-B2, AT-B3, and AT-B4 differ in magnification and accuracy?
The AT-B4 has 24x magnification and 2.0mm accuracy; the AT-B3 has 28x magnification and 1.5mm accuracy; and the AT-B2 has 32x magnification (with 40x optional) and 0.7mm accuracy, which can reach 0.5mm when using an optional micrometer.
Can the AT-B Series be used in confined spaces?
Yes. The AT-B Series features an ultra-short minimum focus distance of 20 cm (7.9 inches) from the end of the telescope, which makes working in confined spaces significantly easier.
Are these auto levels protected against harsh weather conditions?
Yes, with an IPX6 rating, the AT-B Series is protected against powerful water jets from all directions. This allows it to withstand sudden showers or torrential rain, and its advanced design prevents clouding or condensation inside the telescope.
How does the horizontal circle feature work for measuring angles?
Horizontal angles can be directly read in 1° or 1 gon units. The circle supports a free rotation feature so you can read any angle starting from zero, and it is covered to protect against dirt and scratches with a readout window positioned below the eyepiece.