The Haefely Hipotronics Model 2903 Test Cell is for Liquid Insulants.
This test cell measures the dielectric properties of liquid Insulants
such as insulating oil, it determines the dissipation factor tan delta
and the relative permittivity (dielectric constant) as well as the
The test cell has been designed as a cylindrical capacitor with shielded
measuring electrode (guard ring capacitor) and thus avoids partial
capacitances, which might influence the test results.
The rest cell design is accordingly to IEC 60247:2004; ASTM D924-08;
ASTM D1169:2002; VDE 0380-2:2005; BS 5737:1979. The temperature
controller built into the Haefely Hipotronics Model 2831 is used to heat
up the Model 2903 test cell.