LEICA NA2 • NAK2

Universal automatic level

LEICA NA2
The classical level from Leica Geosystems
The NA2 universal automatic level meets all
requirements regarding
precision, convenienceand reliability.
It was designed by surveyors and development
engineers with years ofexperience and who knowwhat a field instrument
has to be able to do.
The NA2 soon pays foritself, because it can beused for all types of surveying job; on building
sites for routine levelling,in engineering projects,
and for geodetic control at
all levels of accuracy.

Universal application• Levelling of all types andall orders of accuracy• Precise levelling andsettlement determinations
on buildings• Routine heighting forthe construction of roads,
railways, pipelines,tunnels and so forth• Setting-out work andcontrol measurements on
the construction site
• Area levelling of highaccuracy• Tacheometric levellingwith the K-version on flat
terrain by combining
stadia and angular measurements with heightreadings• Deformation measurement and monitoring ofbridges

Quickly set up, simple to use

Strong tripods

Centring is easy

Play-free footscrews

In principle, the NA2
can be set up on any LeicaGeosystems tripod. In
practice, for all-roundpurposes, we recommend
the heavy-duty GST20
telescopic-leg tripod.
For precise levelling theGST40 fixed-leg tripod
is suitable because of its
extreme rigidity.

The circular level only
needs to be centred
approximately to bring thecompensator well into its
working range of ~30', andso setting-up goes quicker.

The pitch of the smoothrunning and backlash-freefootscrews is such thatthe bubble can be centred
in a very short time.

The bubble is viewed
positively via a pentaprismand is monitored down
the eyepiece.

Independent oftemperature
Unlike the tubular level ofa traditional instrument, theNA2 universal automaticlevel is relatively insensitive
to direct solar radiation
and an umbrella need only
be considered for the mostprecise levelling.

The modular relationshipbetween instrument andtripod is an advantage
when transport space islimited.

Open sight

Rapid / fine focusing knob
Pentaprism for viewing circular level
Push-button for compensator control
Endless horizontal drive

FootscrewEndless horizontal drive

FootscrewAdjust the line of sight automatically

Easy to level up

Robust and automatic

Minimum maintenance

The advantage of this
instrument is that, as soon
as the bubble is centred,
the line of sight is horizontal
for all pointings of thetelescope. The observer isfreed of the time-consuming
centring procedure involved
with the traditional tubularlevel, and can concentrateon the business of staff
readings.

The compensator isessentially a pendulumwith a prism (4).

In the unlikely event thatthe compensator isdamaged (and this can only
happen as a result of
extremely harsh treatment)
it is replaced easily, being
held only by three screws.

The suspension systemcomprises four flexed
tapes (1) made of a special
alloy to ensure faultlessfunctioning even at extreme
temperatures. The compensator, which is locatedbetween the focusing lensand the crosshair reticle,
is pneumatically damped
against mechanical vibration and is screened against
magnetic fields.

NA2/NAK2 compensator
1 Suspension tapes
2 Prism (fixed)
3 Compensator body
4 Pendulum with prism
5 Line of sight
6 Push-button
7 Spring which taps pendulum
8 Pneumatic damping mechanism

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 sophisticatedsolution.
Pressing the button under
the NA2 eyepiece gives thecompensator 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 thana second, is technicallyperfect, as the pendulum
itself is activated andswings through its fullrange. It is also immediately
apparent if the bubble
is not centred.

Top-class optics

Top-class optics

Fatigue-free viewing

The telescope is of excellent
quality and gives a bright,
high-contrast, erect image,even in poor light – anessential for accurate
levelling. With the standard
eyepiece the magnification
is 32×, the optimum formost applications of theinstrument. Optional
eyepieces are available; the40× may be preferred for
precise levelling, the 25×
in hot, shimmer conditions.
Eyepiece exchange takes
only a second or so.

The reticle has:
– a single horizontal hairfor reading normal staffs– a wedge-shaped hair for
use with invar staffs– stadia hairs for distancemeasurement and threewire levelling.
The general layout of
the controls, the smooth
friction-braked rotationof the instrument, and theendless horizontal drivewith bilateral knobs,
all combine to make theinstrument easy to use.

The focusing knob has acoarse/fine movement:– coarse, for rapid settingwith minimum turning– fine, for the final delicate
touch to give the perfectimage.

At an advantage on
unstable groundAngle measurementwith the NAK2

If a tubular level is usedon unstable ground it tilts
out of range and has to becontinuously reset. By
contrast, the pendulum of
the NA2 “compensates”
and keeps the line of sighthorizontal.

Civil engineers and contractors often require a circle
for angle measurement
and setting-out work. Even
simple detail surveys, bytaking angle, distance andheight, and plotting withthe polar method, can bedone with a level.
The model NAK2 has aninternal glass circle whichis read via a scale microscope and which can be set
to any value by turning
the rim around the baseof the instrument.

NA2 field of view with metric levelling staff
Reading at horizontal hair: 1.143 m

NAK2
circle reading (400 gon)
392.66 gon

NAK2circle reading (360°)
314°42'

High-performance accessories for precise levelling

GPM3
parallel-plate micrometer

GPM6
parallel-plate micrometer

This optional accessory
slips over the telescope
objective and blends
perfectly with the smoothlines of the NA2. Witha compensator setting
accuracy of ±0.3“ (equivalent to 0.01 mm in 10 m)
and a micrometer reading
to 0.1 mm direct and0.01 mm by estimation, theNA2 with GPM3 is an ideal
combination for precise
levelling, deformation
studies, and even optical
tooling. The micrometer
drive for raising and lowering the line of sight is conveniently located and readings are taken on a glassscale viewed through an
eyepiece just above thetelescope eyepiece. This
optical reading system,
which is digital apart fromthe last and estimatedfigure in the metric andinch versions, is superior
to the usual metal drumsystem.

There are tasks for which
a micrometer is needed,
yet for which the very highaccuracy of the GPM3 isnot essential.
To meet this requirement,a simpler micrometerattachment, the GPM6with drum reading,is available for the NA2.
The GPM6 fits on to thetelescope objective in thesame manner as the GPM3,
but the graduation isengraved on a metal drum.

Eyepiece accessories for
specialized tasks
Because of the bayonet
fastening of the interchangeable eyepiece, alltheodolite eyepiece accessories can be used with
the NA2.
• Diagonal eyepiece forobserving from above,
below, and from the side;
useful in cramped spaces• Eyepiece lamp for converting the NA2 intoa horizontal collimator
for laboratory work• Autocollimation eyepiece for setting machineparts and instrumentcomponents precisely
verticalCompact

The rugged NA2 is indifferent
to weather conditions andis extremely reliable in therough world of the buildingsite. The pendulum compensator is protected against
knocks and shocks. There isa highly-effective vibrationdamping mechanism.

PreciseThe high setting accuracy
ensures that the line ofsight stays put. The attachable parallel-plate micrometer renders the NA2
ideal for precise finelevelling.

Reliable, automatic,
maintenance-free

The instantaneous checkfacility with the push-button
control not only makes
work easier; it also
promotes confidence.

Easy handling

The convenient, wellarranged controls aredesigned for maximum
convenience. The bilateral,
endless horizontal
drive promotes rapid
fine-pointing.

Quick levelling-up

The instrument is quickly
set up with the three rapidaction footscrews. Theirself-adjusting threads
make subsequent resetting
unnecessary.

Superb telescope

Telescope with excellentlycorrected optics for bright,
high-contrast images.
All optical components arecoated on both sides.

Effortless focusing

The erect image seen down
the telescope is quickly
and accurately brought into
focus with the convenient
rapid and fine focusing
knob.

Abundant accessories;
many applications

Additional items such as
the parallel-plate micrometer, the laser eyepiece,
or theodolite eyepieceaccessories, offer almost
unlimited possibilities.

LEICA NA2 • NAK2
Proven reliability ensures precise results
Versatile accessories fordemonstrable success

Robust container forsafe transport

A comprehensive programof accessories enables you
to expand the performanceand applications rangeof each instrument.
This way, you can matchyour equipment exactly
to requirements.

The NA2 is supplied in afoam-padded container
made of high performancesynthetic material. The
foam padding absorbs alljolts and shocks. The
container provides perfectprotection for the NA2.

The possibilities aredescribed in brochure“Survey accessories”
710 883en.

Technical data
Standard deviation for 1 km double-run
levelling, depending on type of staff and on
procedureWith parallel-plate micrometer

up to 0.7 mm
0.3 mmTelescopeStandard eyepiece
FOK73 eyepiece (optional)
FOK117 (optional)
Clear objective aperture
Field of view at 100 m
Shortest focusing distanceMultiplication factor
Additive constanterect image
32×40×25×45 mm
2.2 m
1.6 m
1000Working range of compensator
Setting accuracy of compensator (stand. dev.)
Sensitivity of circular level
Glass circle (K version)
Graduation diameter
Graduation interval
Reading by estimation to400 gon (360°)
70 mm
1 gon (1°)
10 mgon (1’)

Water- and dust resistance
Temperature range:
OperationStorage~30’
0.3“8’/2 mm

IP53–20°C to +50°C (– 4°F to 122°F)–40°C to +70°C (–40°F to 158°F)

Parallel-plate micrometer(optional accessory)

RangeInterval

Estimation

GPM3, with glass scale10 mm

0.1 mm0.01 mm

GPM6, with metal drum

10 mm

0.2 mm0.05 mm

Illustrations, descriptions, and technical data are not binding and may be changed.
Printed in Switzerland – Copyright Leica Geosystems AG, Heerbrugg, Switzerland, 1999
710 837en – V.03 – RDV

ISO 9001 / ISO 14001

Total Quality Management –Our commitment to totalcustomer satisfaction
Ask your local Leica
Geosystems agent for
more information
about our TQM program.

Leica Geosystems AG
CH-9435 Heerbrugg(Switzerland)
Phone +41 71 727 31 31
Fax +41 71 727 46 73
www.leica-geosystems.com