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GENERAL INFORMATION ABOUT PRESSURE GAUGES

GENERAL INFORMATION ABOUT PRESSURE GAUGES
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GENERAL INFORMATION ABOUT PRESSURE GAUGES - 1

Data sheet Date Page GENERAL INFORMATION ABOUT PRESSURE GAUGES INTRODUCTION PCI’s gauges are tested and manufactured under ISO 9001 quality standards and comply with the following. Testing EN 837-1 (part 1) Bourdon tube pressure gauge EN 837-2 (part 2) selection, installation and recommendations EN 837-3 (part 3) diaphragm and capsule pressure gauge Connection threads All PCI gauges have threads according to : EN 837-1/7.3.1 – 7.3.2 – 7.3.3 and 7.3.4. Parallel pipe thread (symbol G) according ISO 228-1. Tapered pipe thread (symbol NPT) according ANSI/ASME B1.20.1. Full safety pattern gauges Safety pattern solid front type with baffle wall to EN 837-1/9.7.2/S2-S3 (old DIN design 16006/UNI8541/BS1780). Weatherproof standard for gauges IP54, IP55, IP65 (IEC529). Oxygen and acetylene version Wetted parts materials comply with EN 29539 and EN 837-1/9.7.2/S1. Free of oil and grease. Certified material specification All stainless steel and other exotic materials used in PCI production for connections, flanges, bourdon tubes, diaphragms (wetted gauge process parts) etc. are traceable, all materials are according to DIN EN 10204 – 2.2 or 3.1 (b). PED directive All the PCI pressure gauges are manufactured according to PED directive with release of relative certification for ranges starting from 200bar. ATEX directive All the PCI pressure gauges, on request may be manufactured with ATEX certification and are supplied complete with mark as required. Quality control PCI’s instruments are produced under the rigid codes of the instrumentation industry and QA standards ENISO9001:2008. Our company ISO procedures are continuously controlled and monitored by NQA. _______________________________________________________________________________________________ PCI (Process System Solutions) Ltd, Unit 7 Slaidburn Crescent, Southport, Merseyside, PR9 9YF, UK, Tel: +44 (0) 1704 509090, Fax: +44 (0) 1704 509091, email: sales@pci-instruments.com, Website: www.pci-instrume

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GENERAL INFORMATION ABOUT PRESSURE GAUGES - 2

Data sheet Date Page GAUGE SELECTION GUIDE The following requirements must be considered when selecting a pressure gauge: 1. 2. 3. Position Working conditions Accuracy These will be analyzed with the possible options for each requirement 1. POSITION Instrument diameter must be chosen in relation to distance between installation point and reading position to ensure the operator can see the graduated scale reading. On the right is a representation of legibility of scale subdivision in relation to instrument diameter. 27° = 1/10 scale angular extension EN 837-1 outlines a number of approved...

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GENERAL INFORMATION ABOUT PRESSURE GAUGES - 3

Data sheet Date Page 2. WORKING CONDITIONS It is important to know the working conditions the gauge will be operating in. Things to consider are: • • • • • Fluid Nature Fluid Temperature Working Pressure Pulsating Pressure Vibrations The gauge’s efficiency and life depend on knowing the above conditions. Fluid Nature Clean and inert : the whole range of a standard instruments may be used. Sedimentary : only instruments with diaphragm seal or Schaeffer type gauge may be used. Corrosive : the whole range of instruments may be used but manufactured with materials suitable to resist the...

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GENERAL INFORMATION ABOUT PRESSURE GAUGES - 4

Data sheet Date Page PRESSRE SENSING ELEMENT The main types of pressure elements are : - Bourdon tube type - Schaeffer - Capsule or bellow Bourdon tube pressure gauge: the sensing element is a metal tube drawn in elliptical section and shaped in form a “C” , or spiral. One end is closed while the other is joined to a socket from which the process connection is manufactured. The tube is linked to a movement where the pressure or depression can be measured. Movement is than transferred to the pointer. The application range of these instruments starts from -1 to 2500bar. Schaeffer type...

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