Datasheet PTF 4000 HUBER INSTRUMENTE AG, Grellingerstrasse 23, CH-4208 Nunningen PTF 4000 - Dipping-Bell Primary Pressure Standard class 0.02% Fields of application Best measurement results for adjustment- test- and calibration works in the field of low pressure applications. For example: - Laboratory - University - Cleanroom measurements - Pressure transmitters - Pressure sensors Basic principle of Dipping-Bell On one side of a beam balance, a hanging bell-shaped hollow cylinder (bell) with exactly known effective cross-sectional area immerses in a sealing liquid with low surface tension is mounted. On the other side from the beam balance a pan with weights. Pressure, conducted through the liquid under the bell, results in a buoyancy which is compensated by removing weights from the other side. This method is based on the basic definition: Pressure equals force divided by area. Functionality PTF 4000 The PTF4000 Pressure Primary Standard is a state-of-the-art application of this basic principle. The dipping-bell, made from a thin-walled stainless pipe - closed on the top, is located as underload on a precision balance with electronically controlled force compensation. The pressure to be measured passes through two tubes through the sealing liquid under the bell, thus resulting in a buoyancy. The resulting force is measured and compensated electronically. Complex control algorithms compute under consideration of environmental factors (optional) high precision and reproducibility. This results in the following advantages: » Direct display without manipulation » Easily automated by data output » Permanent reproducibility » Optimal damping of pressure fluctuations HUBER INSTRUMENTE AG, Grellingerstrasse 23, CH-4208 Nunningen Page 1 /2 All rights reserved

Datasheet PTF 4000 HUBER INSTRUMENTE AG, Grellingerstrasse 23, CH-4208 Nunningen Second range 0 ... 4000 Pa (With underload) Measuring range: Error limit: Resolution: Units of measurement: Measured value display: Reproducibility: Settling time: Operating temperature: Relative humidity: Temperature coefficient: Pressure connection: Supply voltage: Power consumption: Net weight: Dimension: Serial interface: Sealing liquid: Option: Nominal range -2000 ... 2000 Pa (Without underload) HUBER INSTRUMENTE AG, Grellingerstrasse 23, CH-4208 Nunningen Page 2/2 All rights reserved