产品名称：Primary Pressure Standard (FRS4) 主压标准（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  低压情景的独特主要标准

l  压力校准范围为0.001 Pa至44k Pa

l  典型不确定度±0.005％读数+ 0.02 Pa

l  在全球范围内的国家和认可实验室中使用

l  现有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）用于世界各地的实验室，是一种高分辨率低压标准，可通过质量和线性测量直接追溯到国家标准。该仪器是校准压力表和压差的金标准。其独特的设计可在极低压力水平下实现高精度，在竞争仪器开始出现不确定性的范围内。

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.

产生标准化压力需要精确了解所涉及的物理组件的指标。FRS4使用具有精确已知质量和尺寸的活塞上的调节气流，高精度数字平衡和精密控制单元。利用这些组件，FRS4能够产生精确的压差，用于校准多种设备，如电容式隔膜真空计，低压变送器和传感器。

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.

精确施工

活塞采用平行四边形悬挂系统悬挂在气缸中央，两者均采用Invar精密设计，Invar是一种低热膨胀系数的镍铁合金。这使得室温下的面积膨胀系数约为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

为了补充FRS4压力平衡，FCS476控制单元可用于从PC提供自动压力控制。

使用抗震运输箱，FRS4易于运输，因此可用于其他压力标准的相互比较，而不易移动

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