计量作业指导书编制要点

论述数字压力计、压力变送器、精密压力表检定标准装置的组成原理、技术参数、操作使用方法以及检定、校准数字压力计、压力变送器、精密压力表所要求的环境条件、技术要求、检定校准方法、结果处理、维护保养等.     

福禄克推出新型压力校准产品 满足仪器仪表技术人员的准确度和量程需求

正福禄克公司为了进一步丰富其精密压力校准产品线,日前推出新款700G系列精密压力计和两款新型压力校准器:Fluke 719Pro和721双量程压力校准器。700G系列精密压力计的压力量程为10inH2O/20mbar至10000psi/690bar,0.05%的新绝压测量准确度,以及新参考级表压测量准确度达0.04%。700G系列精密压力计与Fluke 700PTPK或700HTPK配合使用时,即可实福禄克推出新型压力校准产品满足仪器仪表技术人员的准确度和量程需求R     

基于活塞式压力计和数字压力计的微小压力测量新方法

提出了一种微小表压力（差压）测量的新方法。采用1台活塞式压力计和1台精密的数字压力计,通过关断阀连接高低压端的特殊连接方式实现微小表压力（差压）测量,解决了活塞式压力计由于受其下限值的限制而不能实现微小压力测量的问题。利用数字压力计较好的短期稳定性以及活塞式压力计较低的不确定度,可以实现1~10kPa微小表压（差压）的校准,其校准结果的扩展不确定度为U=2.2Pa（k=2）。     

压力仪表检定的发展方向和现场压力校准

一、数字压力传感器和数字压力计 微电子、微处理技术和新型传感器技术的发展推动了智能化、数字化、高精度、高稳定度数字压力传感器和数字压力计的发展。数字压力传感器于20世纪80年代初由美国Honeywell公司研制成功。不久，美国派诺斯公司推出了准确度更高、稳定性更好的数字式石英压力传感器。智能化数字压力传感器的问世，推动了数字压力计的迅速发展，高精度、稳定性和可靠性好的数字压力计不仅可用于高精度压力测量，还可以作为压力计量检定标准。     

福禄克公司700G系列精密压力计

福禄克公司推出了新款700G系列精密压力计和两款新型压力校准器：Fluke 719Pro和721双量程压力校准器。量程为O．36～10000psi,     

压力表检定方法改进及自动化实现

近年来．数字压力校验仪以其准确度高、操作简单、易于携带受到压力检定人员的欢迎．并得到广泛的应用。但由于JJG49—1999《弹簧管式精密压力表和真空表》检定规程以及JJG52—1999《弹簧管式一般压力表、压力真空表和真空表》检定规程中．标准器主要是以活塞式压力计为参照来进行编写的．故检定过程与数字压力计的检定过程有不一致的地方。     

压力表半自动化检定系统的组建及应用

介绍一种应用CST2 0 0 1型数字化高准确度压力校验仪组建的压力表半自动化检定系统 ,具体描述了压力表半自动检定系统的构成、系统的工作原理、检定系统软件及使用方法。该系统可以实现 0 2 5级以下精密压力表、数字压力计及压力 (差压 )变送器的半自动化检定。     

多功能压力计量标准器的研制

医学压力参数的计量．是法制医学计量工作的重要组成部分．要保证检定结果的准确，首先必须要具备功能完善、容易操作和相应精密等级的标准器。然而．目前用于检定血压计基本误差的标准器．均以数字显示压力计或指针式压力表代替，经多年实际应用证明，因其欠缺设定多点标准压力值的功能，从检定结果上不能达到有关检定规程所规定的要求，例如：检定血压计的标准固定值依次为38kPa、30kPa、     

福禄克公司700G系列精密压力计

福禄克公司推出了新款700G系列精密压力计和两款新型压力校准器：FIuke719Pro和721双量程压力校准器。量程为036～10000psi．具有18种不同的工程单位可选．可以更具用户需求对仪表进行定制。     

2465A型压力计在绝对压力和低微压力的测试与校准中的应用

本文介绍一种新颖的全自动气体活塞式压力计 ,阐述了该压力计的工作原理、基本结构、性能特点和测试与校准要点。     

Increasing the Accuracy of Reproduction of Pressure by Means of the Ukrainian Secondary Standard of the Unit of Pressure

The estimated components of the error in the determination of the effective area of a measuring piston-cylinder assembly of a piston manometer with a non-sealed piston are reported. Such manometers are incorporated into the secondary standard of the unit of pressure.     

Experimental determination of errors in piston manometers at high pressures

Conclusions The suggested method of comparing piston manometers of high pressures by means of a differential instrument is also applicable for determining experimentally the differences between the errors as functions of pressure. The experiments carried out up to pressures of 7000 kg/cm² confirmed the previously obtained formulas of corrections for strains in manometers with different piston systems.     

Effective area of a strained piston in a piston system with a distorted shape

Conclusions The solutions obtained above provide, for a known pressure distribution law, a comprehensive analysis of the phenomena in a piston manometer clearance for any pressure in the operating range.This circumstance in turn can be used in the near future for producing high-pressure reference manometers, and as a substantiated basis for calculating deformation corrections of existing high-pressure piston manometers. The deviations of the latter from a regular geometrical shape are an inevitable consequence of the conditions of their actual deformations under pressure.     

Moderne Kapazitätsmanometer

Vacuum processes in the semiconductor and coating industries are hardly conceivable without capacitance manometers. In these industries the exact measurement of process pressures is extremely important and other measurement methods don't even come close to the superior accuracy, reproducibility and stability of capacitance manometers. The technical development of these pressure transducers during the last 25 years proceeded parallel to the enormous increase of vacuum processes. Many vacuum processes produc ed special types of capacitance transducers and several of these types enable the high efficiency of many production machines. In the following the historical and technical development of the capacitive measurement of pressures is reviewed from manually clamped sensors to compact, welded all metal sensors.     

Measuring pulsating gas-flows

Conclusion The above considerations show that until reliable data are available there is no point in including in the All-Union standard specification for measuring flows a recommendation for evaluating the error in measuring pulsating flows by means of the damping criterion and to classify the differential manometers combined with constricting devices among instruments with standardized errors. Differential manometers can be used in pulsating flows only as indicators of the flow (instruments with a nonstandard error). In this connection the instructions embodied in Regulations 27–54 and referring to the measurement of pulsating flows should be revised. Translated from Izmeritel'naya Tekhnika, No. 11, pp. 57–58, November, 1961     

First relative comparison of initial compression manometers of the USSR and GDR State metrological services

Conclusions The first relative comparisons of the VNIIM (USSR) and the DAMW (GDR) compensated manometers virtually did not reveal any systematic discrepancies between the readings of the compared initial reference instruments (the mean value of deviations amounted to ¯x=0.3%).The pumping action of the mercury vapor flows was investigated for the manometers of both countries. Both parties will endeavour, before the next comparisons, to reduce the absolute error of the initial reference instruments and to extend their measurement range to 10^–3 Pa.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 11–13, April, 1973.     

A Primary Dead-Weight Tester for Pressures (0.05–1.0) MPa

Recent advances in technology on two fronts, 1) the fabrication of large-diameter pistons and cylinders with good geometry, and 2) the ability to measure the dimensions of these components with high accuracy, have allowed dead-weight testers at the National Institute of Standards and Technology (NIST) to generate pressures that approach total relative uncertainties previously obtained only by manometers. This paper describes a 35 mm diameter piston/cylinder assembly (known within NIST as PG-39) that serves as a pressure standard in which both the piston and the cylinder have been accurately dimensioned by Physikalisch Technische Bundesanstalt (PTB). Both artifacts (piston and cylinder) appeared to be round within ±30 nm and straight within ±100 nm over a substantial fraction of their heights. Based on the diameters at 20 °C provided by PTB (±15 nm) and on the good geometry of the artifact, the relative uncertainties for the effective area were estimated to be about 2.2 × 10⁻⁶ (1σ).     

Properties of the substance in the design of differential manometers

An analysis is made of sources of methodological error encountered in the design of differential manometers and in operational monitoring of the discharge of materials and energy carriers. It is shown that these sources of error can be eliminated.Translated from Izmeritel'naya Tekhnika, No. 1, pp. 42–45, January, 1995.     

Equipment for determining the frequency characteristics of differential manometer flowmeters

Conclusions The above equipment and measurement technique make it possible to obtain dynamic characteristics of different recording differential and ordinary manometers, as well as of pressure transducers with a pneumatic output signal. For the latter purpose it is only necessary to use a second strain gauge, as described above, for recording the output signal and utilize the second channel of the TU-4M amplifier.     

Flowmeter optimization in the design of differential manometers

An analysis is made of optimization criteria in the design of differential manometers. It is shown that it is expedient to use as the criterion the highest accuracy attainable for the lowest pressure loss (or for pressure losses not exceeding a specified value). An example is presented to illustrate how a flowmeter is designed on the basis of this criterion.Translated from Izmeritel'naya Tekhnika, No. 2, pp. 35–36, February, 1995.