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2903

Product catalog summary

General Description
The precision test cell type 2903 is designed to measure the dielectric properties of liquid insulants, such as insulating oil. It determines the dissipation factor (tan δ), relative permittivity (dielectric constant), and specific resistivity. The test cell is a cylindrical capacitor with a shielded measuring electrode to avoid partial capacitances. It complies with IEC, ISO, and ASTM standards. The complete setup includes the test cell type 2903a and the heating pot 2903h with built-in heating.

Features and Advantages

Guarded measurement electrodes for high precision measurements.
Temperature range up to 150°C, controlled externally.
Vacuum-sealed design allows for evacuation and degassing of insulating oil.
Embedded pt100 temperature sensors for automatic sequences.
Durable stainless-steel electrodes ensure reproducible test results.

Applications
The test cell is used for capacitance, tan δ, and relative permittivity measurements on liquid insulating materials, including mineral, natural, and synthetic oils, as well as non-conventional liquid samples with high viscosity. It is suitable for research and development in industry and academia.

Scope of Supply

Test cell for liquid insulation type 2903a with heating device.
Heating pot 2903h with main heating device.
Accessories set and connection cable set.
Operating Manual.

Technical Data

Empty cell capacitance: ≈ 60 pF.
Electrode spacing: 2 mm.
Amount of liquid: 40 cm³.
Electrode temperature: ambient to 150°C.
Max. test voltage: 2000 V RMS, 50/60 Hz.

Hardware and Environmental Specifications

Electrode material: Stainless steel.
Heating capacity: 450 W total.
Operating temperature: 0°C to +55°C.
Storage temperature: -20°C to +70°C.
Humidity: 5% to 90% r.h., non-condensing.

Mechanical Specifications

Test cell dimensions: ø 95 x 175 mm.
Heater dimensions: ø 240 x 220 mm.
Weight: Test cell 4 kg, Heater 2.4 kg.

Global Presence
HAEFELY AG has offices in Europe and China, providing contact information for sales inquiries.

Catalog excerpts

2903 Test Cell for Liquid Insulants

Open the catalog to page 1

General Description The precision test cell type 2903 measures the dielectric properties of liquid insulants such as insulating oil, it determines the dissipation factor tan  and the relative permittivity (dielectric constant) r as well as the specific resistivity. The test cell has been designed as a cylindrical capacitor with a shielded measuring electrode (guard ring capacitor) & thus avoids partial capacitances, which might influence the test results. The test cell's design is in accordance with the specifications of IEC, ISO, and ASTM standards (USA). The complete test cell type 2903 consists...

Open the catalog to page 2

Accessories (optional) ▪ 2830/2831 Precision solid and liquid dielectric analyzer including measuring bridge, power supply and heater controller. ▪ 2914 Test cell for solid insulants 2914 Solid Test Cell Technical Data Measurement Empty cell capacitance Electrode spacing Electrode surface Electrode temperature Hardware Electrode material Stainless steel Surface finish Micro finished Heating capacity heating jacket 300 W, heating cartridge 150 W, total 450 W Heat-up time approx. 45 min (for ΔT = 65 K , air filled) approx. 30 min (for ΔT = 65 K , oil filled) Built-in fuses Enviromental Operating...

Open the catalog to page 3

Global Presence Europe HAEFELY AG Birsstrasse 300 4052 Basel Switzerland China HAEFELY AG Representative Office 8-1-602, Fortune Street, No. 67 Chaoyang Road, Beijing 100025 China This document has been drawn up with the utmost care. We cannot, however, guarantee that it is entirely complete, correct or up to date. © Copyright HAEFELY/ Subject to change without notice V2

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Catalog excerpts

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