Contrans P Transmitter. Integral Orifice Assembly / EN. Measuring section for the measurement of small flow quantities

Transcription

1 Contrans P Transmitter Integral Orifice Assembly Measuring section for the measurement of small flow quantities 10/ 1460.BMP Measuring Media: Liquids, Gases (Vapors) Flow Measurement from 1.5 l/h (at = 1000 kg/m ) Nominal Diameter DN 4 / DN 8 Direct Assembly on Transmitter Nominal Pressure PN 0 Corrosion-Resistant Materials Temperature Range -0 C...80 C The integral orifice assembly is a measuring section for the measurement of small flows using the differential pressure method. The choice of eight different orifice diameters provides a wide range of application. The differential pressure p for the corresponding transmitter can be approximately determined with the aid of diagrams 1 and 2. The exact differential pressure is determined during calibra tion.

2 Integral Orifice Assembly Technical Data Measuring Media liquids, gases Nominal pressure PN 100 Nominal diameter DN 4, DN 8 Orifice diameter mm Process connection 1/2-14 NPT Process temperature -0 C C Weight 2.5 kg Process wetted parts: Block Orifice Sealing rings PTFE Other components /1.46 Functional diagram p-transmitter DN 4 DN 8 M01278E1.EPS Page 2of

3 δ Integral Orifice Assembly Flow Measurement of Liquids Formulae, diagram and example for determining the differential pressure limit value and the orifice. Example: Formulae Calculated flow (reference value) = q v x K Technical Data: max. Flow q v = 50 dm /h density = 0.8 kg/dm Solution: q v = q v x K Density correction factor K ρ ρ ρ A A = 1000 kg/m K ρ 800 kg/m 1000 kg/m dm /h dm Diagram 1 According to diagram 1, orifice 2.0 mm comes into consideration. The max. differential pressure p is approx. 1 mbar. 800 [dm /h] 600 Flowrate q ( =1000kg/m ) vd M01291E1.EPS d=5.6 DN8 d=4.0 DN8 d=2.8 DN8 d=2.0 DN4 d=1.4 DN4 d=1.0 DN4 d=0.7 DN4 d=0.5 DN Differential pressure p [mbar] Page of 6

4 δ Integral Orifice Assembly Flow Measurement of Gases Formulae, diagram and example for determining the differential pressure limit value and the orifice. Example: Technical Data 1) : max. Flow q vn = dm /h density = 1.26 kg/m temperature ϑ = 20 C pressure p e = 10 bar atmospheric pressure p amb = mbar Solution: Formulae Calculated flow = q v x K (reference value) Density correction factor ρ A = 1000 kg/m Temperature correction factor Pressure correction factor K ρ K ϑ K p ρ A T A T p p A T A = K p A = bar q v n K ρ n K ϑ K ρ Diagram 2 K ρn 1.26 kg/m 1 kg/m K ϑ K p K K mbar mbar dm /h dm /h.297 According to diagram 2, orifice 1.0 mm comes into consideration. The max. differential pressure p is approx. 250 mbar. 1) 2) Explanation of the indices: n = standard state (0 C, bar) e = excedens (overpressure) abs = absolute Betr. = Operating condition D = diagram If technical data are available in the operating state, the following formulae can also be used for determining q vd : q v Betr. K ρ n K p K ϑ q v n K ρ Betr. 2 K ϑ2 K p q v Betr. K ρ Betr. or or [dm /h] Flowrate q ( =1kg/m ) vd M01292E1.EPS d=5.6 DN8 d=4.0 DN8 d=2.8 DN8 d=2.0 DN4 d=1,4 DN4 d=1.0 DN4 d=0.7 DN4 d=0.5 DN Differential pressure p [mbar] Page 4of

5 Integral Orifice Assembly Ordering Data To order, the order number and the data of the calibrated value will suffice. Integral Orifice Order No / Suppl. No. Assembly DN 4 / DN 8 Integral Orifice Assembly DN 4 Orifice: 0.5 mm mm mm mm mm Integral Orifice Assembly DN 8 Orifice: 2.8 mm mm mm Fixing screws Mounting screws complete 1) Calibration Calibrated for.. (state flow quantity and process medium, e.g. 60 l / h, water at 20 C) Attach Order No. suffixes (Suppl. No.) to the Order No. Order No / / /... 1) "Mounting screws complete" contains 4 screws 7/16-20 UNF x 2 1/4" and 2 PTFE sealing rings for direct connection of the Integral Orifice Assembly to a Differential-pressure Transmitter up to max. PN 100. Higher nominal pressures on request. Note: Integral Orifice Assembly and Transmitter are delivered separately. Supplied against special order: Spare parts Integral Orifice Assembly EN Page 5of 6

6 Integral Orifice Assembly 10/ Dimensional Diagrams Errors and omissions excepted. All dimensions in millimeters (mm). Version DN 4 Connection thread 1/2-14 NPT, 20 mm deep All screws width across flats = 16 mm or " Version DN 8 Assembly examples Integral Orifice Assembly DN 4 Integral Orifice Assembly DN 8 Transmitter is not part of the delivery scope! ABB Automation Products GmbH Schillerstraße 72 D-2425 Minden Tel. (05 71) Fax (05 71) Subject to technical changes. Printed in the Fed. Rep. of Germany 10/