geo-FENNEL FET 220K-L Digital Theodolite User Manual

: October 30, 2023
: geo-FENNEL

geo-FENNEL FET 220K-L Digital Theodolite

Dear customer

Thank you for your confidence in us having purchased a geo-FENNEL instrument. This manual will help you to operate the instrument appropriately. Please read the manual carefully – particularly the safety instructions. A proper use only guarantees a longtime and reliable operation.

geo-FENNEL
Precision by tradition.

Product Information

FET 220K-L

The FET 220K-L is a precision instrument manufactured by geo-FENNEL. It is designed for triangulations, polygonizations, and engineering surveys in construction and cadastral surveys. The instrument is equipped with a laser point finder, an electronic base level, and a compensator for precise angle measurements. It has a circular level and a plate level for accurate measurements. The product comes with a carrying handle, an optical sight, and a tribrach clamp for stable positioning. The FET 220K-L is powered by a Li-Ion battery pack or Alkaline batteries.

Product Usage Instructions

FET 220K-L

Supplied with: Check the contents of the package to ensure all components are present.
Power Supply: Turn off the instrument and remove the Li-Ion battery case. Charge the Li-Ion battery outside of the instrument and insert it again when fully charged. For operation with batteries, insert the batteries into the Alkaline battery case (take care of correct polarity) and fix the battery case in the battery compartment.
Keypad and Functions: Familiarize yourself with the instrument’s keypad and functions. The instrument has various buttons for different functions such as setting, holding, shifting, and switching to the electronic base level display.
Operation: Prepare the instrument for measurement by turning on the electronic V-circle adjustment and adjusting the horizontal circle if necessary. Aim at the target with the optical sight and focus using the focusing drive. Take measurements by pressing the appropriate buttons on the keypad.
Safety Notes: Read and follow the safety instructions in the manual carefully to ensure safe and proper use of the instrument.

Supplied with

Electronic Theodolite FET 220K-L
Tribrach
Li-Ion rechargeable battery
Charger
Battery case for alkaline batteries
Container
User manual
Optional: 90° diagonal eyepiece FET 220 / 220K-L

Features

2 large easy-to-read LCDs
Laser plummet for easy set up over the ground point
Illumination of LCD and field of view
Horizontal circle: Hold-Function, 0-set at any desired position, clockwise/anti-clockwise reading
Vertical circle: reading in gon / degrees / percent
For measuring horizontal, vertical and zenith angles. For use in engineering, civil engineering and general construction.
Particular attention has been paid to making the instruments user-friendly with a large easy-to-read display at both sides and a laser plummet for precise positioning over a ground point.
Easy levelling in both X and Y axes without tedious turning of the instrument thanks to the electronic base level in the display.

Technical data

Telescope magnification	30 x
Clear objective aperture	45 mm
Shortest focusing distance	1,5 m
Angle measurement	incremental
Accuracy	2“ (0,6 mgon)
Shortest focusing distance	1“ (0,2 mgon)
Compensator	2-axis compensator
Measuring units	400 gon / 360°
Laser point finder	focusable
Laser class	2
Beam diameter	6 mm / 100 m
Maximum visibility	180 m
Deviation	5“
Laser plummet/tolerance	± 1,5 mm / 1,5 m
Laser class	2
Plate level	30“ / 2 mm
Circular level	8‘ / 2 mm
Power supply / operating time	10 h / Li-Ion
Temperature range	-20°C bis +50°C
Dust/water protection	IP 54
Tribrach	detachable
Weight	4,2 kg

Power supply

Power off the instrument and remove the Li-Ion battery case. Charge the Li-Ion battery outside of the instrument and insert it again when fully charged.
Operation with batteries: Insert the batteries into the Alkaline battery case (take care of correct polarity) and fix the battery case in the battery compartment.

Recharge the battery

Remove the Li-Ion battery box from the instrument and insert the plug of the charger into the charging socket of the battery box.

Red light at the charger indicates that the batteries are being charged.
Green light at charger indicates that the batteries have been fully charged.

Before first use of the instrument fully charge the rechargeable batteries.

Battery status indication

Full power
Effective
Low power but still effective
Very low power, replace the alkaline battery / recharge the NiMH battery pack
The instrument will shortly power off automatically.
Replace the alkaline battery / recharge NiMH battery pack immediately

keypad and functions

Carrying handle
Handle locking screw
Optical sight
Vertical tangent screw and clamp
Keypad
Objective lens
Plate level
Display
Eyepiece
Tribrach
Footscrew
Focusing drive
Battery compartment
Horizontal tangent screw and clamp
Tribrach clamp

FACTORY SETTINGS

Minimum reading: 1“
Unit of angle measurement: DEG
Automatic shut-off: OFF
Vertical angle measuring mode: zenith angle
Automatic compensation: ON

Functions of buttons

Button/ Function

: Power ON/OFF the unit; keep the button pressed until a beep sounds
0SET: 0SET of the horizontal angle
R/L: Left/right horizontal angle measurement
HOLD: HOLD the horizontal angle
V/%: Vertical angle / percent display

Switch to the second button function with SFT:

SFT + SFT: Display of the electronic vial (press fast and short)
SFT + 0SET: Power ON/OFF the laser plummet
SFT + R/L: Power ON/OFF the laser point finder
SFT + REP: Repeated angle measurement
SFT + V/%: Power ON/OFF the display illumination

Press SFT to quit the second button function.

Display indication

VT: Vertical angle
n-6: Number of repeated measurements
HR: Right horizontal angle
HL: Left horizontal angle
T1: First direction
T2: Second direction
CRN: Compensator ON (1 axis, 2 axes)
SFT: Optional function keys (second button function)
%: Vertical grade %
REP: Status of repeated measurement
HLD: HOLD = Wert halten

If the display shows TILT after activating the TILT compensation function, which means exceeded compensation range, the instrument should be aligned.

OPERATION

Preparation for measurement

Level and centre the instrument precisely to ensure an optimum performance.

Tripod

Extend the tripod legs to a suitable height and tighten them.

Fix the instrument onto the tripod

Attach the instrument onto the tripod carefully. Screw in the retaining bolt until the instrument is carfeully fixed.

Level the vials

For this power on the instrument; the electronic vial will appear automatically in the display after the beep. First adjust the ciruclar vial, then adjust the plate vial. The plate vial has been adjusted correctly and the instrument is leveled perfectly if the plate vial stays centered no matter in which direction the instrument is rotated.
When the vials have been centered press SFT to quit the display indication.

Ground point centering

The ground point can be marked with the laser point.

POWER ON the instrument

Keep the ON/OFF key pressed for 1 sec.
A beep will sound and the electronic vial will be displayed. When both directions X/Y have been levelled press SFT to quit this mode. Now the instrument is ready for use.
The vertical angle indication will show the current value.
Press the key V/% to switch the vertical angel indication to %.

PARAMETER Setting

Keep 0SET pressed and power on the instrument
– >Display indication = parameter 1 (with the current setting)

Set parameter

with R/L (OFF / 1-AX / 2x-AX) set the tilt correction
- Select parameter 2 with 0SET
with R/L (OFF / ON) select the verticle angle indication OFF (zenith 0), ON (horizontal 0)
- Select parameter 3 with 0SET
with R/L (OFF / ON) select automatic shut-off ON/OFF (automatic shut-off after 20 minutes)
- Select parameter 4 with 0SET
with R/L (1“ / 5“ / 10“) set the minimum angle reading
- Select parameter 5 with 0SET
with R/L set the angle unit (OFF = DEG / ON = GON)
- Confirm the setting with SFT and quit this mode.

Tilt correction function

This theodolite is equipped with a compensator (display indication CRM). The TILT angle of the instrument will be compensated automatically by the device. If the instrument is tilted too much TILT will be shown on the display which means the instrument exceeds the compensator range. Level the instrument more precisely (for activation / de-activation see (SETTING METHODS).

HORIZONTAL ANGLE 0SET (0SET)

Aim at the target.
Press 0SET; the reading of the horizontal angle starts flashing.
Keep 0SET pressed for 3 seconds. Now the horizontal angle reading is 0°00’ 00”:
- The 0SET key is only effective for the horizontal angle.
- The horizontal angle can be set 0 at any time except in the HOLD mode (HOLD key).

Vertical ANGLE SET

Keep R/L pressed while powering on the instrument with .
Display indication: SETUP
Display indication: F1
Press O-SET
Display indication: STEP 1 – first rotation (A)
Confirm the adjustment via collimator with O-SET
Rotate
Display indication STEP 2 – second rotation (B)
Confirm the adjustment via collimator with O-SET

MODE CONVERS ION OF the HORIZONTAL RIGHTWARD (HR) AND LEFTWARD (HL) TURNING INCREMENT

Standardly the horizontal angle mode is clockwise (display indication HR).
Press R/L to transform the horizontal angle mode to anti-clockwise (display indication HL).

The key R/L is of no effect to the vertical angle

Press R/L again to transform the mode from HL to HR.

HORIZONTAL ANGLE LOCKED – UNLOCKED (HOLD)

Press HOLD; the horizontal angle reading will flash.
Keep HOLD pressed for 3 seconds.
Now the horizontal angle reading is locked and the reading stops flashing.
Press HOLD again to quit this mode / release the value.

Slope percent mode (%)

Press V/% to switch the vertical angular reading shown in degrees into a percent reading.
The maximum % value will be 99.999 %; exceeding this the display will show —,—- %.

ANGULAR REPEATED MEASUREMENT

Press SFT + REP to start this mode.
T1 will flash in the display.
Aim at the first target and press 0SET; the horizontal reading will set to 0.
T2 will flash in the display.
Aim at the second target and press HOLD; display line 2 will show the average of the horizontal readings, display line 1 will show the number of repeated measurements.
T1 will flash in the display; now you can aim again at the first target and all following steps can be repeated as above.
Press SFT to quit this mode.

Distance measurement using The stadia method

Distance measurement can be carried out with FET 220K-L by using the crosshair.

Read the levelling rod.
Aim the instrument‘s telescope at the levelling rod.
Mulitply the value of the distance „d“ between the two stadia hairs with 100.
The result „D“ = the distance from the instrument centre to the levellig rod (D = d x 100).

Attention: FET 220K-L – Special version for the alignment of masts and antennas

with special crosshairs

one interval (small) centre to 1 equates to:
- 10 mm over a distance of 25 m
one interval (large) 1 to 2 equates to:
- 20 mm over a distance of 25 m (The values rise linearly.)

AUTOMATIC shut-off

The automatic shut-off function will power off the instrument after 20 minutes without operation.
For activation and de-activation of this mode please refer to PARAMETER SETting.

DISPLAY illumination

In dark surroundings and at unfavorable light conditions the display can be illuminated.
Press SFT + V% to power on / off the display illumination.

Use of the laser

With the built-in laser beam the target can be aimed at and marked. By focussing the laser dot can be adjusted. Such, the marking of the target can be accomplished by one person only.
The laser beam is pulsed and can therefore be used together with any geo-FENNEL receiver for rotating lasers. Thus, FET 220K-L can be applied for any task that would require the use of a rotating laser.
The smallest diameter of the laser dot will be achieved if the laser beam is focused.
By means of the laser beam all measuring tasks can be accomplished and will be visualized to the user.

Safety notes

INTENDED USE OF INSTRUMENT

Triangle, polygon and engineer measurements in the field of civil engineering as well as cadastral survey.

Care and cleaning

Handle measuring instruments with care. Clean with soft cloth only after any use. If necessary damp the cloth with some water.
If the instrument is wet clean and dry it carefully. Pack it up only if it is perfectly dry. Transport in original container/case only.

Specific reasons for erroneous measuring Results

Measurements through glass or plastic windows; dirty laser emitting windows; after the instrument has been dropped or hit. Please check the accuracy.
Large fluctuation of temperature: If the instrument will be used in cold areas after it has been stored in warm areas (or the other way round) please wait some minutes before carrying out measurements.

Electromagnetic acceptability (EMC)

It cannot be completely excluded that this instrument will disturb other instruments (e.g. navigation systems); will be disturbed by other instruments (e.g. intensive electromagnetic radiation nearby industrial facilities or radio transmitters).

CE-Conformity

The instrument has a CE mark according to EN 55022:2010, EN 55024:2010, EN 61000-3-2:2006+A1:2009+A2:2009, EN 61000-3-3:2008.

WARRANTY

This product is warranted by the manufacturer to the original purchaser to be free from defects in material and workmanship under normal use for a period of two (2) years from the date of purchase. During the warranty period, and upon proof of purchase, the product will be repaired or replaced (with the same or similar model at manufacturers option), without charge for either parts or labour. In case of a defect please contact the dealer where you originally purchased this product. The warranty will not apply to this product if it has been misused, abused or altered. Without limiting the foregoing, leakage of the battery, bending or dropping the unit are presumed to be defects resulting from misuse or abuse.

Safety instructions

Follow up the instructions given in the user manual.
Do not stare into the beam. The laser beam can lead to eye injury. A direct look into the beam (even from greater distance) can cause damage to your eyes.
Do not aim the laser beam at persons or animals.
The laser plane should be set up above the eye level of persons.
Use the instrument for measuring jobs only.
Do not open the instrument housing. Repairs should be carried out by authorized workshops only.
Please contact your local dealer.
Do not remove warning labels or safety instructions.
Keep the instrument away from children.
Do not use the instrument in explosive environment.
The user manual must always be kept with the instrument.

LASER CLASSIFICATION

The instrument is a laser class 2 laser product according to DIN IEC 60825-1:2014.
It is allowed to use the unit without further safety precautions.
The eye protection is normally secured by the aversion responses and the blink reflex.
The laser instrument is marked with class 2 warning labels.

Exceptions from responsibility

The user of this product is expected to follow the instructions given in the user manual. Although all instruments left our warehouse in perfect condition and adjustment the user is expected to carry out periodic checks of the product’s accuracy and general performance.
The manufacturer, or its representatives, assumes no responsibility of results of faulty or intentional usage or misuse including any direct, indirect, consequential damage, and loss of profits.
The manufacturer, or its representatives, assumes no responsibility for consequential damage, and loss of profits by any disaster (earthquake, storm, flood etc.), fire, accident, or an act of a third party and/or a usage in other than usual conditions.
The manufacturer, or its representatives, assumes no responsibility for any damage, and loss of profits due to a change of data, loss of data and interruption of business etc., caused by using the product or an unusable product.
The manufacturer, or its representatives, assumes no responsibility for any damage, and loss of profits caused by usage other than explained in the user manual.
The manufacturer, or its representatives, assumes no responsibility for damage caused by wrong movement or action due to connecting with other products.