|Product Code:||NA2 Series|
The NA2 universal automatic level meets all requirements regarding precision, convenience and reliability. It was designed by surveyors and development engineers with years of experience and who know what a field instrument has to be able to do.
The NA2 soon pays for itself, because it can be used for all types of surveying job; on building sites for routine levelling, in engineering projects, and for geodetic control at all levels of accuracy.
|Quickly set up, simple to use|
In principle, the NA2 can be set up on any Leica Geosystems tripod. In practice, for all-round purposes, we recommend the heavy-duty GST20 telescopic-leg tripod. For precise levelling the GST40 fixed-leg tripod is suitable because of its extreme rigidity.
The modular relationship between instrument and tripod is an advantage when transport space is limited.
|Centring is easy|
The circular level only needs to be centred approximately to bring the compensator well into its working range of ~30', and so setting-up goes quicker.
The bubble is viewed positively via a pentaprism and is monitored down the eyepiece.
|The pitch of the smoothrunning and backlash-free footscrews is such that the bubble can be centred in a very short time.|
|Independent of temperature|
|Unlike the tubular level of a traditional instrument, the NA2 universal automatic level is relatively insensitive to direct solar radiation and an umbrella need only be considered for the most precise levelling.|
|Adjust the line of sight automatically|
|Easy to level up|
|The advantage of this instrument is that, as soon as the bubble is centred, the line of sight is horizontal for all pointings of the telescope. The observer is freed of the time-consuming centring procedure involved with the traditional tubular level, and can concentrate on the business of staff readings.|
|Robust and automatic|
The compensator is essentially a pendulum with a prism (4).
The suspension system comprises four flexed tapes (1) made of a special alloy to ensure faultless functioning even at extreme temperatures. The compensator, which is located between the focusing lens and the crosshair reticle, is pneumatically damped against mechanical vibration and is screened against magnetic fields.
|In the unlikely event that the compensator is damaged (and this can only happen as a result of extremely harsh treatment) it is replaced easily, being held only by three screws.|
|Push-button control – added security|
With most automatics one taps the tripod or instrument to check if the compensator is functioning. Leica Geosystems offers a far more sophisticated solution.
Pressing the button under the NA2 eyepiece gives the compensator a gentle tap, so that you see the staff image swing smoothly away and then float gently back to give the horizontal line of sight. This check, which takes less than a second, is technically perfect, as the pendulum itself is activated and swings through its full range. It is also immediately apparent if the bubble is not centred.
Standard deviation for 1 km double-run
levelling, depending on type of staff and on...
|Procedure||up to 0.7 mm|
|With parallel-plate micrometer||0.3 mm|
|Standard eyepiece||32 x|
|FOK73 eyepiece (optional)||40 x|
|FOK117 (optional)||25 x|
|Clear objective aperture||45 mm|
|Field of view at 100 m||2,2 m|
|Shortest focusing distance||1,6 m|
|Working range of compensator||~30’|
|Setting accuracy of compensator (stand. dev.)||0.3“|
|Sensitivity of circular level||8’/2 mm|
|Glass circle (K version)||400 gon (360°)|
|Graduation diameter||70 mm|
|Graduation interval||1 gon (1°)|
|Reading by estimation to||10 mgon (1’)|
|Water- and dust resistance||IP53|
|Temperature range||Operation||-20°C to +50°C (-4°F to 122°F)|
|Storage||-40°C to +70°C (-40°F to 158°F)|
|Parallel-plate micrometer (optional accessory)||Range||Interval||Estimation|
|GPM3, with glass scale||10 mm||0,1 mm||0,01 mm|
|GPM6, with metal drum||10 mm||0,2 mm||0,05 mm|