Level measurement of chemicals and pharmaceuticals

The primary demand is high accuracy, independently from the measurement range. The minimal accuracy needed is 5 mm, but in several cases measurement values have to be provided within a measurement error of 1–2 mm. In parallel with high accuracy, the long-term operational stability required is even more stringent. The applicable regulations define several calibration procedures to be undertaken on an annual basis, without the possibility of transporting the instruments to the factory for any reparation or adjustment. In most cases the special mediums to be measured require explosion-proof instruments. Moreover the instruments have to be suitable for the measurement of materials with a low dielectric constant (εr).

There are two product families of level transmitter solutions developed and produced by NIVELCO Process Control Co. which satisfy these requirements: 

• NIVOTRACK M-500/600 magnetostrictive level transmitters: Typically we offer rigid rod probe versions of NIVOTRACK transmitters up to 3-meter probe length, and flexible probe versions are recommended above 3 meters because of easier packaging, transporting and handling. The wide range of the applicable floats provide reliable solutions for low density (below 0.85) mediums up to 0.4 g/cm3 viscosity. Moreover this measurement method is independent from the relative dielectric constant (εr) of the measured medium. Stainless steel probes are not applicable for use in chemically aggressive mediums, in this case we offer a PFA plastic coated probe version with a plastic (PP or PVDF) float.