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  1. Danfoss Flow Meter User Manual Pdf
  2. Danfoss Controller Manual
  3. Siemens Danfoss Flow Meter
Danfoss Flow Meter User Manual

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Brochures
Danfoss flow meter
Product data sheets
Measurement system “oriflow” with compact orifice
Measurement system “autarkon” with compact orifice – EWZ 120.1 & EWZ 127.1
Measurement system “autarkon” with standardized differential pressure devices – EWZ 140.1/147.1
Measurement system “autarkon” with venturi tube 150.1/157.1 Steam / Gas
Measurement system “autarkon” with venturi tube – 150.1/157.1 Liquids
Measurement system “autarkon” with cross probe – EWZ 211.7
Measurement System “autarkon” with cross probe – EWZ 311.7
Ultra sonic meter for heat / cooling applications – EWZ 817
Ultra sonic meter for heat / cooling applications – EWZ 817G
Ultra sonic meter for heat / cooling applications – EWZ 817T
Ultra sonic meter for heat / cooling applications – EWZ 837
Magnetic inductive meters for cooling applications – EWZ 617
Magnetic inductive meters for cooling applications – EWZ 617 calibrated
Vortex Meter – VTX3
Flow and Energy Calculator – ERW 700
Temperature sensor
Operating Manuals
Measurement system “oriflow” with compact orifice
Measurement system “autarkon” with compact orifice – EWZ 120.1 & EWZ 127.1
Measurement system “autarkon” with standardized differential pressure divices – EWZ 140.1/147.1
Flow and energy calculator ERW 700
Flow and energy calculator ERW 700, “M-Bus Extension”
Flow and energy calculator ERW 700, “Profibus Extension”
Flow and energy calculator ERW 700, “RS 485 Extension”
Flow and energy calculator ERW 700A
Flow and energy calculator ERW 700(A) “Modbus Extension”
Measurement system “autarkon” with cross probe – EWZ 211.7
Measurement system “autarkon” with cross probe – EWZ 311.7
Ultra sonic meter for heat / cooling applications EWZ 817 / EWZ 837
Magnetic inductive meters for cooling applications – EWZ 617
Vortex Meter – VTX3
Vortex Mester VTX3 additional Manual Ex-protection
Temperature sensor
APPLICATION EXAMPLE
Steam Measurement by mean of a ISA 1932 Nozzle
Standard volume flow measurement Venturi tube
MID
Messsystem “autarkon” mit Kreuzsonde
Durchfluss- und Energierechner – Wärme
Durchfluss- und Energierechner – Kälte
Pressure Equipment Directive
EC Type Examination Certificate Module H Vortex Meter VTX3
EC Type Examination Ex- Approvals
EU Type Examination Certificate Vortex Meter VTX3 KIWA 18 ATEX 0041 X
Declaration of conformity / Declaration of manufacturer
QM


Basic Elements

Just like other flowmeters, differential pressure flowmeters consist of two elements. They are:
A primary element: This element causes a change in kinetic energy which results in the differential pressure in the pipe. The unit must be suitably matched to the

  • pipe size,
  • flow conditions, and
  • the liquid’s properties

Danfoss Flow Meter User Manual Pdf

Besides, the measurement accuracy of the element must be fine over a practical range.
A secondary element: The secondary element measures the differential pressure created by primary element and gives the signal or read-out which is in turn transformed to the actual flow value.

Types of Differential Pressure Flowmeters

Most widely used differential pressure flowmeters are:

  • Orifice Plates
  • Flow Nozzles
  • Venturi Tubes
  • Variable Area flowmeters, i.e. Rotameters


Accuracy & Rangeability

Performance of a head-type flowmeter installation is a function of the

  • precision of the flow element and
  • the accuracy of the d/p cell

On average, flow element precision is expressed in percentage of actual reading terms, whereas d/p cell accuracy is stated as a percentage of calibrated span. A d/p cell typically provides accuracy of ±0.2% of the calibrated span. With no detrimental effect on accuracy, rangeability of a flowmeter can be extra enhanced by employing several d/p flowmeters in parallel runs.


Errors and Noise

In case of compressible fluids, the ratio of differential pressure divided by upstream pressure should not exceed 0.25 for reduction of error and correction of density. Metering errors caused due to wrong installation of the primary element can become considerable i.e. up to 10%. Following are the possible causes of these errors:

  • the condition of the mating pipe sections
  • insufficient straight pipe runs
  • pressure tap and lead line design errors

In turbulent flow conditions, not more than 10% of the d/p signal could possibly be noise produced by disturbances from valves and fittings. These disturbances can be both up- and downstream of the element, and by the element itself. To sort out this noise, a damping is provided in d/p cells which prove to be adequate for majority of the applications. Rigorous noise can be diminished by applying two or more pressure taps connected in parallel on both sides of the d/p cell.

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Danfoss Controller Manual

Sources

OmegaTech

Engineering Toolbox

Siemens Danfoss Flow Meter

Omega.literature