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Operation Manual

Refractometer

This  AB  Aqua  Medic  Refractometer  is  an  optical
precision  instrument  for  determing  exactly  the
concentration  of  brine  in  salt  water  aquarium.  By
using only a few drops the concentration of salt water
can  be  determined  within  seconds.  The  salt
concentration  (salinity)  can  be  read  as  parts  per
thousand or in density (d 20/20).

The

operational

principle

based

the

determination  of  the  refraction  of  light  index.  This  is
dependant  on  the  concentration  of  salt  in  brine.  This
Refractometer has also got an automatic temperature
compensation.

1. Included in shipment

This  Refractometer  is  supplied  in  a  plastic  box
including  a  dosing  pipette  and  screwdriver  for
calibrating.

2. Technical Data

Measuring range:
Density:

1,000 – 1,070

Salinity:

0 – 100 °/°°

Dissolution of scale:

0,001/1°

Compensated
temperature scope:

10 – 30°C

3. Calibration

Before  taking  this  Refractometer  in  use  for  the  first
time, it has to be calibrated by distilled water or water
of  a  reverse  osmosis  device.  For  calibrating,  it  is
important to stick to a temperature of 20°C.
First  of  all,  open  daylight  plate  and  place  3  drops  of
distilled  water  on  the  main  prism.  Close  the  daylight
plate carefully avoiding any air bubbles. For about 30
seconds,  allow  the  sample  to  adjust  to  the  same
temperature as the Refractometer. Hold daylight plate
in  the  direction  of  a  light  source  and  look  into  the
eyepiece.  The  eyepiece  may  be  turned  for  focussing.
You  will  see  a  circular  field  containing  numbers.  The
upper part of the field should be blue while the lower

part should be white. Look into the eyepiece and turn
the  calibration screw until the boundary line between
the  upper  blue  field  and  the  lower  white  field  meet
exactly  on  the  zero  scale.  That  is  the  end  of  the
calibration

process.

Now

you

can

use

this

Refractometer

for

measurements

room

temperature of 10°C – 30°C.

4. Measurement

The  measurement  is  done  the  same  way  as  the
calibration. You put 2 – 3 drops of the sample on the
main  prism  and  close  the  daylight  plate  carefully.  If
you  look  through  the  eyepiece  now  you  can  see  the
measured  value  as  a  boundary  line  of  the  blue  and
white zone. You can see the density (kg/l) as well as
the salinity in parts per thousand.
After  each  use,  clean  the  instrument  by  using  a  soft
cloth.  Don’t  put  it  into  water  since  then  it  might
become  foggy  and  useless.  The  Refractometer  is  an
optical  instrument.  It  requires  careful  handling  and
storage. With care, this instrument will provide years
of reliable service.

5. Warranty

Should  any  defect  in  material  or  workmanship  be
found within 12 months from the date of purchase AB
Aqua  Medic  GmbH  undertakes  to  repair  or,  at  our
option,  replace  the  defective  part  free  of  charge  –
always  provided  the  product  has  been  installed
correctly,  is  used  for  the  purpose  that  was  intended
by  us,  is  used  in  accordance  with  the  operating
instructions  and  is  returned  to  us  carriage  paid.  The
warranty term is not applicable on the all consumable
products.
Proof  of  Purchase  is  required  by  presentation  of  an
original  invoice  or  receipt  indicating  the  dealer’s
name,  the  model  number  and  date  of  purchase,  or  a
Guarantee Card if appropriate. This warranty may not
apply  if  any  model  or  production  number  has  been
altered, deleted or removed, unauthorised persons or
organisations  have  executed repairs, modifications or
alterations,  or  damage  is  caused by accident, misuse
or neglect.
We regret we are unable to accept any liability for any
consequential loss. Please note that the product is not
defective under the terms of this warranty where the
product,  or  any  of  its  component  parts,  was  not
originally  designed  and  /  or  manufactured  for  the
market in which it is used.
These  statements  do  not  affect  your  statutory  rights
as a customer.
If your AB Aqua Medic GmbH product does not appear
to  be  working  correctly  or  appears  to  be  defective
please contact your dealer in the first instance.
Before  calling  your  dealer  please  ensure  you  have
read and understood the operating instructions. If you
have any questions your dealer cannot answer please
contact us.
Our  policy  is  one  of  continual  technical  improvement
and  we  reserve  the  right  to  modify  and  adjust  the
specification of our products without prior notification