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Haefely Hipotronics


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2820A C, L, & Tan Delta Bridge
2830/31 Oil & Solid Dielectric Anal.
2840 High Precision Tan Delta Sys.
2883 MIDAS Micro
2903 Test Cell Liquid Insulants
2914 Test Cell Solid Insulants
MIDAS Mobile Analyzing System







Transformer Oil
Oil Paper
Solid materials (Teflon,
   Silicone, Rubber etc)

The 2830/2831 is a valuable tool for factory tests, routine tests, R&D tests and regular maintenance.


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2830/2831 Oil & Solid Dielectric Analyzer

2820A C/L/Tan Delta Measuring Bridge
2820A C/L/Tan Delta Measuring

Home | Products | Haefely-Hipotronics | Power Factor Tester/Tan Delta | 2830/2831 Oil and Solid Dielectric Analyzer


HAEFELY Hipotronics Logo

Test Cells for Liquid and Solid Insulants - 2903 and 2914

2903 Test Cell for Liquid Insulants
2903 Test Cell for Liquid

Model 2903 Overview
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 specific resistivity.

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.



No-Load Capacitance

60pF approximately

Electrode Spacing





stainless steel, micro finished

Electrode Temperature

ambient to 150C

Heating Capacity

heating jacket 300W, heating cartridge 150W, total 450W

Heat-up Time

35 minutes (up to 90C)

Electric Strength in Air

2000 Volts RMS

Maximum Electric Field



0.95mm x 175mm (Test cell type 2903a)


0.240mm x 220mm (Test cell 2903a with heating pot 2903)


5.2kg (test cell type 2903a)


8.2kg (test cell with heating type 2903)


2914 Test Cell for Solid Insulants

2914 Test Cell for Solid

Model 2914 Overview
The Haefely Hipotronics Model 2914 test cell is used for dielectric tests on solid test samples. It determines dissipation factor tan delta and relative permittivity (dielectric constant) on solid insulates such as paper and plastic foils, as well as specific resistivity.

The test cell is equipped with a shielded measuring electrode (guard ring) which eliminates partial capacitances which influence test results.

The design is the result of long standing experience in the field of test cell building. It has been designed in accordance with specifications of VDE (Germany) and SEV (Switzerland) as well as with ASTM standards (USA) and conforms to recommendations of CIGRE, IEC and ISO.



Test Surface


Diameter of Measuring Electrode



stainless steel, hardened, lapped

Heating Capacity

Two (2) heating plates of 630W each, total combined 1260W

Electrode Temperature

ambient to 250C continuous, maximum 300C (1 hour, 50% duty cycle)

Heating up Time

15 minutes approximately

Temperature Control

with temperature controller built-in to Haefely Hipotronics Model 2831

Electrode Pressure

0 to 10N/cm2, adjustable

Maximum Test Voltage

2000 Volts RMS, 50/60Hz

Test Cell Evacuation up to

3 x 10-4 mbar


Ordering Information

Haefely Hipotronics 2903

Test Cell for Liquid Insulants

Haefely Hipotronics 2914

Test Cell for Solid Insulants


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Macey's Electrical Pty. Ltd.
ABN 17 344 601 468
Unit 1, 49 Gavenlock Road, Tuggerah, NSW Australia 2259
Phone: +61 2 4353 4644    Mobile: 0412 678 925