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 (FAQ)
QWhat makes the compensator of the AT-B Series highly durable and accurate?
The AT-B Series compensator features four suspension wires made of super-high-tensile metal, which minimizes thermal expansion. It is paired with a finely tuned magnetic damping system that quickly stabilizes the line-of-sight against vibrations from nearby heavy machinery or busy roads.
QCan the AT-B Series levels be used in tight or confined spaces?
Yes. The AT-B Series features an ultra-short minimum focus distance of just 20 cm (7.9 inches) from the end of the telescope, making it exceptionally easy to work in highly confined environments.
QHow weather-resistant are these automatic levels?
The AT-B Series carries an IPX6 water protection rating. This means the instrument can withstand powerful water jets from any direction, protecting it from sudden heavy rain showers and preventing internal fogging or condensation.
QWhat are the main differences between the AT-B2, AT-B3, and AT-B4 models?
The models differ primarily in magnification and leveling accuracy: AT-B4 has 24x magnification and 2.0mm accuracy; AT-B3 has 28x magnification and 1.5mm accuracy; and AT-B2 has 32x magnification and 0.7mm accuracy (which can be improved to 0.5mm using an optional micrometer).
QHow does the horizontal circle angle measurement work?
Horizontal angles can be read directly in 1° or 1 gon units. A free rotation feature allows users to set any angle reference from zero. The circle is protected against dust and scratches, and the readout window is conveniently placed below the eyepiece.