The NIST traceable, factory calibrated probes, each with an invariant
cell constant that is accurate over its entire 8-plus decade range makes the 2100 unique in the field of conductivity meters, allowing it to accurately follow processes through many decades of conductivity.
The calibration procedure determines the
cell constant, which is the effective ratio of path length to electrode area for a particular probe in the standard solution.
The cells were cultured in RPMI 1640 medium supplemented with 10% (v/v) fetal calf serum and 100 U/ml penicillin-streptomycin in a
cell constant temperature incubator under humidified atmosphere of 5% C[O.sub.2] at 37[degrees]C.
The sensor's conductivity
cell constant is 1c=1.0 +/10 percent for a wide measurement range within its temperature/pressure of 60[degrees]C/100psig.
The sensor's conductivity
cell constant is k=i.0 +/-10% for a wide measurement range within its temperature/pressure of 60[degrees]C/100psig.
It consists of a global R-C parallel dipole, with the components [R.sub.L] and [C.sub.L] being, respectively, linked to the fluid conductivity [[sigma].sub.L] and permittivity [[epsilon].sub.L] by the geometrical factor defined in (2) as the
cell constant [c.sub.k] expressed in [m.sup.-1] [1].
The calibration was done by finding the
cell constant. The KCl solution of known EC, i.e.
The decrease in
cell constant and cell volume above x = 0.02 may be due to the larger binding energy of cerium ions with oxygen as compared to that of ferric ions [16].
Features include automatic or manual temperature compensation, automatic conductivity
cell constant recognition with auto ranging, and up to five-point calibration.
ABB says, the AC200's high accuracy of
cell constant eliminates the need for on-site calibration or entering of cell correction values during installation.
By employing an appropriate
cell constant, c, it is possible to determine the specific electrical conductivity from the resistance and temperature measurements (American Public Health Association 1985) as: