3B SCIENTIFIC 1000553 지침서 - 페이지 2
{카테고리_이름} 3B SCIENTIFIC 1000553에 대한 지침서을 온라인으로 검색하거나 PDF를 다운로드하세요. 3B SCIENTIFIC 1000553 3 페이지. Conductivity sensor
페이지 인쇄5. Operation
5.1 General instructions
Rinse the lower end of the electrode
thoroughly with distilled water, shake off
any remaining water and dry with filter
paper.
Select the expected measurement range
for
the
test
liquid
appropriate measuring range button.
Immerse the end of the electrode with the
slot at its tip into the liquid to be tested.
Important: the graphite cell surfaces must
be completely immersed in the test liquid.
Stir the liquid gently with the electrode, and
after 5 to 10 seconds read the measured
value.
When
switching
temperature of the test liquid, the chosen
measuring range button must be held
down for at least 2 seconds.
Wait for a new display to appear on the 3B
unit ("Probe Detect") and read
TM
NETlog
off the temperature.
Press the appropriate measuring range
button again to return to conductivity
measuring mode.
Before making another measurement in a
different liquid, wash the electrode again in
distilled water and repeat the steps
described earlier.
The measurement system is suitable for a
temperature range from 15°C to 35°C. The
calibration temperature is about 25°C.
5.2 Calibration
The electrode is supplied pre-calibrated and
ready for use. Recalibration can only be
carried out at present by the manufacturer 3B
Scientific GmbH.
5.3 Cleaning and care of the electrode
If electrodes get polarised or dirty they
must be cleaned using hot water and a
mild detergent.
Organic substances should be removed
with acetone. Algae, bacteria, mould or
mildew should be removed with a solution
of sodium hypochlorite.
Do not use abrasives or objects that can
scratch the surface.
Finally, wipe the electrode with a cotton
cloth.
by
pressing
the
over
to
show
the
6. Experimental applications
Distinguishing
substances with ionic or molecular structures
in liquids, e.g. dilute solutions of acids and
alkalis.
Demonstrating the direct relationship between
conductivity and ion concentration in liquids.
Measuring ion concentrations in unknown
solutions.
Measurements
photosynthetic processes in a basin containing
aquatic plants, and observing the simultaneous
reduction of bicarbonate ion concentration.
In-situ measurements of total quantities of
dissolved solids (TDS, in mg/l) in lakes or
streams.
Observing rates of chemical reactions involving
the uptake or release of a conducting
substance.
Conductivity changes in titrations with two
substances in stoichiometric quantities.
Measurements of the rate of diffusion of one
type of ion through a membrane (osmosis).
Measurements
of
dissolved solids in an aquarium containing
aquatic plants and animals such as fish.
Distinguishing between photosynthesis and
respiration
7. Sample experiments
The increase in the conductivity of distilled
water when common salt is added.
Equipment required:
TM
1 3B NETlog
@ 230 V
or
TM
1 3B NETlog
@ 115 V
TM
1 3B NETlab
1 Conductivity sensor
1 Glass beaker, 600 ml,
shallow form
1 Set of Scout Pro
electronic scales, 200 g
1 Carton of table salt (500 g approx.)
1 Petri dish
1 Teaspoon
300 ml distilled water
Pour 300 ml of distilled water into the
beaker.
Immerse the conductivity electrode (which
must first have been thoroughly cleaned) in
the water so that it reaches the bottom of
the beaker.
2
qualitatively
between
of
conductivity
conductivity
and
1000540
1000539
1000544
1000553
1002872
1009772
for
total