4-electrode conductivity measurement. High measuring accuracy even when dirty.

4-electrode conductivity measuring system

4-electrode conductivity measuring system with fitting TA40  Technical data download

What does the cell constant mean, e.g. ZK0.5, ZK1...?

Conductivity probes consist of a pair of electrodes. The cell constant K is an essential property of the probe and reflects the relation of electrode distance to electrode areas. Because the conductivity between the electrodes is affected by the cell geometry, the area and spacing must be defined as ZK. For a traditional cell with two platinum electrodes of 1 cm² area at a distance of 1 cm, the cell constant is K = 1.0 cm-1  
 

C = conductivity in Siemens per cm (S/cm)
R = electrical resistance in ohms
G = conductance in Siemens (S; 1 S = 1 Ohm-1)
L = electrode spacing (cm)
A = electrode area (cm²)
K = cell constant ( cm-1); K = L/A


For weakly conducting samples, the electrodes are moved closer together while reducing L to obtain smaller cell constants of ZK 0.1 and ZK 0.01 cm-1. This measure increases the conductivity between the electrodes and thus simplifies the electronic evaluation by the measuring instrument. Conversely, increase L for strongly conducting solutions
(cell constant K = 3 cm-1) 
0022.4300 TA40 head with cable gland PG9

 
19,80 EUR
 
plus 19% tax
0022.4020 TA40 tube 20cm

 
38,00 EUR
 
plus 19% tax
0022.4050 TA40 tube 50cm

 
40,00 EUR
 
plus 19% tax
0022.4100 TA40 tube 100cm

 
43,00 EUR
 
plus 19% tax
0022.4490 PVC-U fitting, 2 1/4" 2-fold adhesive socket

 
8,80 EUR
 
plus 19% tax
0022.4500 TA40 adapter ring d=63
for screw connection 2 3/4 "
Outer diameter: 78.4mm
 
26,50 EUR
 
plus 19% tax
0022.4510 PVC-U fitting, 2 3/4" 2-fold adhesive socket

 
12,00 EUR
 
plus 19% tax
0022.0476 TA40 connector
is used to connect 2 tubes TA40. 
26,40 EUR
 
plus 19% tax
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