產品名稱：Primary Pressure Standard (FRS4) 主壓標準（FRS4）

Key Features

l  A unique primary standard for low-pressure scenarios

l  Pressure calibration range from 0.001 Pa to 44k Pa

l  Typical uncertainty of ± 0.005 % reading + 0.02 Pa

l  Used worldwide in national & accredited laboratories

l  New 2017 version now available

l  低壓情景的獨特主要標準

l  壓力校準范圍為0.001 Pa至44k Pa

l  典型不確定度±0.005％讀數+ 0.02 Pa

l  在全球范圍內的國家和認可實驗室中使用

l  現有2017年新版本

Used in laboratories throughout the world, the Furness Controls Reference Standard (FRS4) is a high-resolution low-pressure standard directly traceable to national standards via mass and linear measurement. The instrument is the gold standard for the calibration of both gauge pressure and differential pressure. Its unique design allows high levels of accuracy at very low pressure levels, in the range where competing instruments begin to experience uncertainty.

Furness Controls Reference Standard（FRS4）用于世界各地的實驗室，是一種高分辨率低壓標準，可通過質量和線性測量直接追溯到國家標準。該儀器是校準壓力表和壓差的金標準。其獨特的設計可在極低壓力水平下實現高精度，在競爭儀器開始出現不確定性的范圍內。

Producing a standardised pressure requires precise knowledge of the metrics of the physical components involved. The FRS4 uses regulated air flow over a piston with precisely known mass and dimensions, a high accuracy digital balance, and a precision control unit. With these components the FRS4 is able to generate a precise differential pressure for use in the calibration of a multitude of devices, such as capacitance diaphragm gauges, and low-pressure transmitters and transducers.

產生標準化壓力需要精確了解所涉及的物理組件的指標。FRS4使用具有精確已知質量和尺寸的活塞上的調節氣流，高精度數字平衡和精密控制單元。利用這些組件，FRS4能夠產生精確的壓差，用于校準多種設備，如電容式隔膜真空計，低壓變送器和傳感器。

Precise Construction

The piston is suspended centrally in a cylinder using a parallelogram suspension system, and both are precision-engineered from Invar, a nickel-iron alloy with a low thermal expansion coefficient. This gives an area expansion coefficient at room temperature of around 4 ppm.

精確施工

活塞采用平行四邊形懸掛系統懸掛在氣缸中央，兩者均采用Invar精密設計，Invar是一種低熱膨脹系數的鎳鐵合金。這使得室溫下的面積膨脹系數約為4ppm。

User-friendly

To complement the FRS4 pressure balance, the FCS476 control unit can be used to provide automatic pressure control from a PC. 

Using the shock resistant transport case, the FRS4 is easily transportable, making it useful for the inter-comparison of other pressure standards with are not so readily moved.

方便使用的

為了補充FRS4壓力平衡，FCS476控制單元可用于從PC提供自動壓力控制。

使用抗震運輸箱，FRS4易于運輸，因此可用于其他壓力標準的相互比較，而不易移動

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