- Key Features
- The reliable standard for very low pressure
- A non-rotating piston gauge with automatic control system
- Proven performance, ease of use and long-term stability
Accuracy
Maintaining calibration traceability and accuracy is of utmost importance to national standards laboratories, calibration facilities, as well as the manufacturers of pressure measurement devices.
| Version | Pressure Range | Resolution |
|---|---|---|
| 10cm² | 0 - 44 kPa | 0.01 Pa |
| 20cm² | 0 - 22 kPa | 0.005 Pa |
| 45cm² | 0 - 9 kPa | 0.002 Pa |
| 100cm² | 0 - 3.4 kPa | 0.001 Pa |
Supplied in four different versions, the FRS4 covers a range from zero to 44 kPa for the highest pressure version, and zero to 3.4 kPa for the lowest.
The resolution of the lowest pressure model is 0.001 Pa, with an uncertainty of ±(0.005% reading + 0.02 Pa).
Air or gas is supplied to the FRS4 at the top of the cylinder and flows to the return port near the base. The constricted space between the piston and cylinder results in a pressure differential between the top and bottom of the piston. The position of the piston is maintained laterally by a beryllium-copper flexure system, and the vertical position is maintained by the force balance.
The amount of force required to maintain the vertical position of the piston is exactly equal to the difference in force exerted by the gas on to the top surface of the piston compared to the bottom surface of the piston, plus the piston weight. Because the dimensions of the piston are known precisely, the force balance gives a reading of the pressure differential that is directly traceable to physical properties.
It is crucial to have access to a pressure standard you can trust, with a long servicing period that allows you to maximise workload.