Pressure measurement with the Dipping Bell-Primary Pressure Standard class 0.02% F.S.
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
2 Versions available
±20 mbar
+40 mbar
HUBER INSTRUMENTE AG has won the public tender of "Technische Hochschule Ingolstadt".
The first - new HUBER dipping bell was delivered in autumn 2015.
Basic principle of the 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:
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
Measuring range:
Nominal range: -2000 ... 2000 Pa (Without underload)
Second range: 0 … 4000 Pa (With underload)
Error limit: ± 0,02 % FS
Resolution: 0,01Pa
Units of measurement: mbar, Pa, hPa, kPa, psi, mmHg, ….
Measured value display: 7-Seg. LED, 14 mm
Reproducibility: 0,005 %
Settling time: ˜2,5 s
Supply voltage: 12V DC, 1.5A (external Power Supply inclusive)
Power consumption: 18 W (VA)
Net weight: 25 kg
Dimension: 400 x 240 x 700 mm
Serial interface: USB / RS 232 for HM30 Meteo Station
Sealing liquid: Fluorinert FC-40
Option: Meteo Station for compensation of the environmental influences
Please feel free to contact for detailed specifications, accessories, software and options.