KROHNE – INTEGRAL ORIFICE METER RUN ASSEMBLY

The integral orifice meter run assembly is a differential pressure flowmeter especially designed for smaller line sizes where the surface roughness, weld seams and other geometrical imperfections have a relatively big influence on the measurement uncertainty. The DP flowmeter therefore features a minimum length of upstream and downstream pipe, reducing additional uncertainties of the installation to a minimum. It is suitable for process and allocation measurement of gases and liquids including viscous fluids, fluids with suspended solids or fluids with gas entrainment. KROHNE offers the complete orifice assembly with orifice meter run, DP transmitter, valves, accessories, engineering, and documentation. The DP flowmeter comes pressure tested and ready for commissioning.

Features & Options

• Standardised calibrated orifice assembly for high accuracy requirements
• Design acc. to ISO 5167 or ISO TR 15377 from DN15 / ½″ up to DN100 / 4”, other sizes and designs on request
• Elimination of additional uncertainties due to installation effects
• Low TCO (Total Cost of Ownership) due to reduced engineering, commissioning and installation costs
• Reduced need for recalibration in the field through advanced 3-D linearised OPTIBAR DP transmitters
• Complete flowmeter solution with orifice meter run, manifold, DP transmitter, sizing and documentation from a single source
• Redundancy available (1oo2, 2oo3)
• HART^®7, Foundation fieldbus and Profibus-PA communication options
• SIL 2/3 certified versions
• Ex ia, Ex d, Ex t approvals

General information

Product type	Flowmeter
Product family name	OPTIBAR
Product positioning	For process applications with small line sizes (down to DN15 / ¾″4)
Measurement principle	Differential pressure
Measured media	Liquids, Gases, Steam
Nominal diameter / size	DN20…DN50 / ¾” ..2”

Operating conditions

Process pressure	max. 160 bar/ 2320 psi
Process temperature	-130…+400°C/ -202…+752°F

Materials

Measuring tube

Austenitic stainless steel (1.4404/316L), Carbon steel (A105), Alloy steel (ASTM A182 Gr. F12), Alloy steel (ASTM A182 Gr. F22), Alloy steel (ASTM A182 Gr. F91)

Process connections

Flange connections

EN (1092-1): DN15…100 ASME (B 16.5): ½…2″

Approvals/Standards

Certificates/Approvals Custody transfer (CT)	AGA 3
Certificates/Approvals Ex	ATEX, IECEx, NEPSI
Certificates/Approvals Others	Oxygen, Pressure Equipment Directive (PED), ISO/TR 11583
Certificates/Approvals Safety	SIL 2/3
NAMUR compliance	NE 107, NE 21, NE 43, NE 53
Design standards	ISO 5167, ASME MFC-3M

Communication

Analogue outputs	4…20 mA
Digital outputs	FOUNDATION™ Fieldbus, HART®, Profibus-PA, Bluetooth®

Accuracy

Reference uncertainty	0.15…0.22%
Calibration	Volumetric calibration with hot water, Gravimetric calibration with hot water, High pressure natural gas calibration