2
en
1. Introduction
We would like to thank you for your decision to purchase this CLEMENT CLARKE product.
If the instructions in this manual are carefully followed, we are confident that this product will
give you reliable and trouble-free usage.
We will be forced to disclaim any warranty and liability if the instrument is altered in any way
or if routine maintenance is neglected or not carried out according to factory specifications.
Only original CLEMENT CLARKE accessories are to be used to ensure continued reliability of
the instrument.
Following the popular
Mark 2
Perkins tonometer, comes the technically advanced and well
designed
Mark 3
model. Its improved LED illumination and convenience are some of the
many features which maintain the reputation of
Perkins
hand-held instruments in the
forefront of tonometry.
Because the
Perkins
tonometer is capable of being used in all positions, the mass of the
Goldmann doubling prism must be controlled accurately. Only
HAAG-STREIT prisms
should be used
or the disposable
Tonosafe
prism can be used to prevent cross-infection.
Any other prisms may give a false reading if used in the
Perkins
tonometer.
1.
1
Technical Description
A pair of spiral wound flat springs connected in series are progressively tensioned by rotation
of the operator’s calibrated thumb-wheel. The resulting force stored in the spring is
transmitted through a balanced arm to the applanation doubling prism or the Tonosafe prism
mounted at its end.
The tonometer is fitted with two cobalt blue LEDs, (wavelength 450-490nm) to provide
illumination. These are powered by a 3.6V, 280 mAh Ni-Mh rechargeable battery.
The LED meets the requirements for a Class 1 LED product to IEC/EN 60825-1 (2001) under
normal operating conditions and those of single fault failure.
The battery charger conforms to Class II insulation and has also been tested to EN60601
and UL60601-1.
This equipment is designed and manufactured to be as safe as is reasonably practicable
when installed and used correctly by persons qualified to do so in accordance with the
manufacturer’s instructions. Any misuse, incorrect assembly or installation could result in
the equipment becoming unsafe. It must not be repaired except by competent
persons under the manufacturer’s instructions.