the conductivity is a cumulative parameter for the ionic concentration of a solution. the more salt, acid or alkali in a solution, the greater its conductivity. the unit of conductivity is s/c123. the scale for aqueous solutions begins with pure water at a conductivity of 0.05 μs/cm (25°c). naturally occurring waters such as drinking water or surface water have a conductivity in the range 100 – 1000 μs/c123. the upper end of the scale is reached by some bases such as potassium hydroxide solutions with a conductivity of just over 1000 ms/c123.
conductivity is measured by making a measurement of the electrical resistance. the simplest kind of measuring cell used consists of two similar electrodes. an alternating voltage applied to one of the electrodes causes the ions in the solution to migrate towards the electrodes. the more ions in the solution, the greater the current which flows between the electrodes. the instrument measures the current and uses ohm’s law to calculate first the conductance of the solution and then – by taken the cell data into account.
thermal conductivity of honey:
the specific heat of honey is in the 0.54-0.60 cal/g/°c range for liquid honey, and is equal to 0.73 cal/g/°c for finely granulated honey. the thermal conductivity of honey increases with temperature and total solids, ranging from 118 x 10 -5 to 143 x 10 -5 cal/cm sec °c.
蜂蜜检测设备-仪器
contents:
data-line conductivity temperature measureing instrument/standard conductivity electrode with waterproof plug/ set cehcsolutions 2 x 100ml 1413μs and 12,88 ms at 25oc incl. electrode stand, all well arranged in profi box.
additionally available:
pt100 sensor with handle
ptc temperature sensor
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measuring range |
resolution |
accuracy |
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conductivity μs |
0,1 0 to 3 9,99 μs |
0,5 % x0,0 5 μs |
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conductivity ms |
20,0 to 3 99,9 μs |
0,5 % ± 0,1 μs |
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200 to 3999 μs |
0,5 % ±1 μs |
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2,00 to 39,99 ms |
0,5 % ±0,01 ms |
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20,0 to 399,9 ms |
2 % ± 0,1 ms up to 2o ms |
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and 6 % from 100 to 399 ms |
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tds |
o to 3999 ppm |
2% ± 1 ppm |
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salinity |
0,0 to 70,0 g/kg |
0,5 % ± 0,1 at range 2,0 to 42,0 g/kg |
at range o to 30°c |
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temperature ( n tc 30) |
-5,0 to 105,0 ° c |
0,2 ° c |
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ptc |
-50,0 to 1 50,0 ° c |
0,2 ° c ±0,2 |
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pt 100 |
-100,0 to 399,9 ° c |
0,2 ° c 0,4 |
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data memory |
250 data sets with identity no./measuring value/time/date |
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automatic measurements |
at intervals 1/213/5/10/20/30 minutes and 1/2/3/4 hours |
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auto off |
adjustable from 1 to 59 min (after last operation) |
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clock |
with calendar, summer- and wintertime will be adjusted automatically |
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power supply |
4 x 1,5 v aa alkaline batteries |
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operatingtime |
approx. 4000 h |
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interface |
rs 232 c / parameter 2400 baud/b/p1 |
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protocol |
ascii |
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dimension |
170 x 79 x 39 mm (lx w x n) |
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weight |
350 g (weight only of instrument ) |
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case |
protection type ip 66 and ip 67 |
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