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© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
8.1 Function check / zero adjustment
The inspection gauge (38) supplied with the device will as‑
sist the user in checking the proper functioning of the unit.
The type plate with the serial number can be found on the
rear of the gauge. This check takes place for the rst time
when the device is commissioned. Subsequent test inter‑
vals (1 week) will be specied by the software (message
displayed). For exact procedure see software instructions
for use. Should the test be outside the tolerance limits,
a software message appears and the unit must be tak‑
en out of use. Notify your HAAG‑STREIT customer sup‑
port center.
38
8.2 Cleaning
Regular dusting of the device with a soft cloth is sufcient. More stubborn dirt can
be removed using a soft, lint‑free cloth dampened with water or alcohol at maxi‑
mum 70%.
WARNING!
• Avoid making the device wet and use only the means listed above. Under
no circumstances use solvent or any abrasives.
• The T-Cone must never be immersed in cleaning uid or disinfectant. No
abrasive or otherwise aggressive agents must be used for cleaning/disin‑
fection. Suitable media include water and up to 70% alcohol. Ensure that
the T‑Cone is dry after every cleaning/disinfection.
A dust cover is included in the accessories of the LS 900. Cover the device when
the room is being cleaned or if it is not used for longer periods of time. Always re‑
move the dust cover before switching on the power.
WARNING!
The device must not be switched on when covered! (Heat build-up, re
hazard).
8.3 Maintenance of T-Cone (option)
The optional T‑Cone requires practically no maintenance apart from the cleaning of
the tip between patients (see Measuring with the T‑Cone).
Sphere 3 (mm),
R=8.844
−0.017 0.056 0.46 −0.024 0.038 1.61
Sphere 4 (mm),
R=10.501
−0.040 0.082 0.48 −0.069 0.044 0.58
Sphere 1: ø11.5 mm
Toric, ellipsoid, sphere 2,3,4: ø14 mm
All surfaces: Precision ± <1 μm
Test surfaces were centred within ± 0.1 mm and their symmetry axes aligned within
± 0.5° with regard to their measuring axis.
6.5.3 Reproducibility
Human cornea (axial curvature difference, D / elevation difference, µm)
Central Zone
(Diameter ≤ 3 mm)
Middle zone
(3 < Diameter ≤ 6 mm)
Mean value 1 st. dev. 2 st. dev. Mean value 1 st. dev. 2 st. dev.
−0.001 / − 0.38 / 0.66 0.76 / 1.31 −0.020 / − 0.36 / 3.22 0.72 / 6.45
n = 42 eyes
7. Software / Help menu / Error messages
The software’s help section contains instructions and help for performing an exam‑
ination and descriptions of the error messages. The help can be opened via the F1
key or in the [?] – [Help] menu.
WARNING!
The software must be installed by trained personnel in accordance with
the separate installation instructions.
8. Maintenance
The LS 900 is practically maintenance‑free and requires only minimum care to work
for as long as possible to your complete satisfaction. However, we recommend in‑
structing a service engineer to inspect the biometer periodically. HAAG‑STREIT or
your local agent will be happy to provide further information.
01-IFU_LS900-7220055-04100_eng.indd 15 17.06.2015 10:56:03
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