e-survey ESL2 User manual

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Automatic Level
ESL2
INSTRUCTION MANUAL

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Contents
1. Equipment....................................................................................................5
2. Applications .................................................................................................5
3. Technical Data.............................................................................................. 6
4. Description...................................................................................................7
4.1 Instrument.......................................................................................... 8
4.2 Leveling Staffs.................................................................................... 9
4.3 Tripod...............................................................................................10
5. Instructions for Use ...................................................................................10
5.1 Unpacking and Setting Up................................................................10
5.2 Leveling Up.......................................................................................10
5.3 Focusing and Sighting ......................................................................11
5.4 Compensator Checking ....................................................................11
6. Measuring ..................................................................................................12
6.1 Normal Height Measurement ...........................................................13

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6.2 Distance Measurement from Stadia Readings (fig.2) ......................15
6.3 Precise Height Measurement with ESM1 (fig.3)..................................16
7. Testing and Adjusting.................................................................................19
7.1 Tripod...............................................................................................19
7.2 Circular Level(fig.5) ..........................................................................19
7.3 Horizontality of the Line of Sight ....................................................21
8. Care and Transport ....................................................................................24
8.1 Transport .........................................................................................24
8.2 Storage ............................................................................................25
8.3 Cleaning and Drying .........................................................................26

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1. Equipment
1.1 Standard Equipment
1x Set ELS2 Universal Automatic Level, with 360°/400g circle
1x Adjusting pin each container
1.2 Optional Accessories
ESM1 parallel plate Micrometer can be used with WILD NA2/NAK2 and
ESL2 Measuring range:10mm
Parallel Plate Micrometer ESM1
With glass reading scale Range Interval Estimation
10mm 0.1mm 0.01mm
2. Applications
Model ESL2 Automatic Level is adoptable for the second and third class
leveling, It is also used for general construction engineering and installation of
large size machines. The advantage of the automatic is that as soon as the
circular bubble is centered, the line of sight is horizontal for all pointings of
the telescope. Elimination of the traditional tubular level speeds up work and
improves accuracy.

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3. Technical Data
ESL2 ESL2+ESM1
Standard deviation of 1KM
double run ±1.0mm ±0.5mm
Telescope
Image Erect
Magnification 32x
Clear objective aperture 45mm
Shortest focusing distance 1.6m
Multiplication factor 100
Additive constant 0
Compensator
Working range ±14′
Setting accuracy ≤0.3″
Circular level sensitivity 8′/ 2mm
Horizontal circle 360°(400g)
Minimum reading 1°(1g)
Weight 2.5 kg

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4. Description
Fig.1 Automatic Level
1. Base plate 6. Telescope eyepiece
2. Footscrew 7. Press button
3. Horizontal drive, endless 8. Circular level
4. Telescope objective housing 9. Prism for viewing circular level
5.Optical sight 10. Focussing knob with cores/fine motion
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8
4
3
2
1
6
7
5
ESL2

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4.1 Instrument
The base plate (1) has a standard thread enabling the ESL2 tobeused on
any of our tripods which are sufficiently stable (and on any other tripod
having a 5/8″thread fixing screw). The rotatable upper partof the
instrument consists chiefly of the telescope with an optical mechanical
compensator. The compensating element is essentially a pendulum,
supported by four suspension tapes and carrying a prism. The rapes are ofa
special alloy to guarantee correct compensator functioning even at extreme
temperatures (-30℃to +50℃). Provided the circular bubble(8) (sensitivity 8′
per 2mm) has been set in its setting circle by turning thethree
footscrews(2). The line of sight will be automatically horizontal as the
pendulum will bewell within its working range of ±14′. The movement of
the pendulum is efficiently air damped.
The ESL2 is equipped with a press button(7) to check the functioning of the
compensator. When the button is pressed, before reading the staff, the
pendulum is given a slight tap and, as a result of the pendulum’s swing, the
staff image swings smoothly awayand then floats gently back to its original
position with respect to the horizontal cross hair. The observer is then
certain that the compensator is working and that the line of sight is

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horizontal. The press button also verifies the leveling upofthe
ESL2’ because the staff image will not show the correct movement on
pressing the button if the circular bubble is long away from its central
position, but the movement will be quicker and shorter due to the
pendulum reading its stop.
The eyepiece(6) with dioptric scale is turned to focus the reticle cross hairs.
After turning the bayonet locking ring anticlockwise, the eyepiece can be
removed and replaced by an optional eyepiece.
The reticle haswedged-shaped hairs for precise leveling with the parallel
plate micrometer, and a single horizontal hair for normal leveling staffs. It
also has 1:100 stadia hairs(6.2).
The focusing knob(10)is turned to obtain a sharp image of the staff.It has
a coarse and fine motion. Rotation ofthe instrument is friction-braked.
Fine-pointing is by means ofthe endless horizontal drive screw(3). The
drive has knobs ateach side for use with either hand.
4.2 Leveling Staffs
As the telescope of the ESL2 gives an erect image, leveling staffs with erect
numbers should be used. It is emphasized that the accuracy of leveling
depends just as much on the staffs as on the level.

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High quality staffs must be used.
4.3 Tripod
For normal leveling the model L tripod with telescopic legs is usually
preferred. For precise leveling and severe conditions e.g. strong wind the
model M tripod is recommended. As the fixing screw on all of our tripods
have the same thread however, any our tripods can be used. Each tripod
has a plastic cover for the tripod head.
5. Instructions for Use
5.1 Unpacking and Setting Up
When setting up the tripod. The legs must be trodden firmly into the ground.
The tripod head should be as horizontal as possible and height should be
such that the telescope eyepiece will be comfortably at the observer’s eye
level. With a telescopic leg tripod check that the clamps are tight. The
instrument is set on the tripod head.
5.2 Leveling Up
To level up the instrument turn the footscrews (2) until the circular level (8)
lies in the centre of its setting circle. The line of sight is then automatically

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set by the compensator to horizontal. For adjustment of the circular level,
please refer 7.2.
5.3 Focusing and Sighting
The telescope is pointed towards a uniformly light surface. Or a sheet of
white paper and the telescope eyepiece (6) is turned until the reticle
cross-hairs appear sharp and absolutely black. The eyepiece diopters scale
reading now indicates the correct setting for the observer’s eye. By looking
alone the optical (or open) sight (5) and turning the instrument by hand the
telescope is pointed roughly at the Leveling staff. Turn the focusing knobs
(10), which have coarse and fine motion. Until the staff image appears
sharp and free from parallax with respect to the cross hairs, i.e. there
should be no apparent movement between the horizontal hair and a staff
graduation when the observe moves his eye slightly up and down. To bring
the vertical cross-hairs exactly on to the centre of the staff turn the
horizontal drive (3).
5.4 Compensator Checking
Before reading the staff, when the button (7) is pressed, the staff image
swings smoothly away and then floats gently back to its original position