KROHNE DK Data sheet
Technical Datasheet
Technical Datasheet
DK46 - DK800
DK46 - DK800
DK46 - DK800DK46 - DK800
Technical DatasheetTechnical Datasheet
Variable area flowmeter
• Local indication without auxiliary power supply
• Adaptable to meet customers' requirements
• Replaceable mounting parts that are easily assembled
© KROHNE 07/2009 - 4000193403 TD DK46_800-R04 en
CONTENTS
DK46 - DK800
1 Product features 3
1.1 DK46 - DK800 variable-area flowmeter........................................................................... 3
1.2 Options and variants......................................................................................................... 5
1.3 Operating principle........................................................................................................... 7
2 Technical data 8
2.1 Technical data................................................................................................................... 8
2.2 Dimensions and weights ................................................................................................ 11
2.3 Measuring ranges...........................................................................................................13
2.4 Differential pressure regulators .................................................................................... 16
3 Installation 19
3.1 Intended use ................................................................................................................... 19
3.2 Installation conditions ....................................................................................................19
3.2.1 Installation in the piping ....................................................................................................... 19
4 Electrical connections 20
4.1 Limit switch .................................................................................................................... 20
5 Order form 21
6 Notes 22
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DK46 - DK800
1.1 DK46 - DK800 variable-area flowmeter
The DK46...DK800 flowmeters are suitable for measuring the volume flow rate of liquids and
gases.
PRODUCT FEATURES 1
DK46 accuracy 4,0%
DK800 accuracy 2,5%
DK47 accuracy 2,5%
DK48 accuracy 1,0%
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1 PRODUCT FEATURES
Highlights
• Simple installation and start-up
• Compact design
• Low maintenance
• Limit switches are optional
• All variants come with high quality needle valves
• No wearing parts
• Fragment protection
Industries
• Chemical
• Heating, cooling, and air conditioning
• Iron, steel and metal
• Oil & Gas
• Pharmaceutical
• Analytical technology
• Mechanical engineering
• Paper and pulp
• Water
DK46 - DK800
Applications
• Fine metering
• Gas chromatography
• Minimum level monitoring and control
• In connection with a differential pressure regulator: Ensures constant flow rate in the case of
variable inlet or outlet pressures
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DK46 - DK800
1.2 Options and variants
DK devices with limit switches
PRODUCT FEATURES 1
The DK devices can be provided with max. two
limit switches, NAMUR or 3-wire open
collector.
DK with differential pressure regulators
Differential pressure regulators are used to
provide constant flow rates in the case of
variable inlet or outlet pressures.
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1 PRODUCT FEATURES
Instrument designation
DK46 - DK800
Instruments with head 1 and foot pieces 2
made from:
Stainless steel = DK…/R
Brass = DK…/N
PVDF = DK…/PV
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DK46 - DK800
1.3 Operating principle
The flowmeter operates on the float measuring principle
The measuring unit consists of a glass cone in which a float can move freely up and down. The
medium flows through the flowmeter from bottom to top.
The float adjusts itself so that the buoyancy force AAAA, acting on it, the form drag WWWW and its weight GGGG
are in equilibrium: G = A + W
G = A + W.
G = A + WG = A + W
PRODUCT FEATURES 1
Figure 1-1: Operating principle
The height of the float is read on the scale of the measuring glass and indicates the flow rate.
The top edge of the float marks the reading line for flow values.
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2 TECHNICAL DATA
2.1 Technical data
•
The following data is provided for general applications. If you require data that is more
relevant to your specific application, please contact us or your local representative.
•
Additional information (certificates, special tools, software,...) and complete product
documentation can be downloaded free of charge from the website (Downloadcenter).
Measuring system
Application range Flow measurement of liquids and gases
Operating method / measuring principle Variable area measuring principle
Measurement
Primary measured value Float position
Secondary measured value Operating and standard volumetric flow
Measuring accuracy
Directive VDI / VDE 3513, sheet 2 (qG = 50%)
DK46 4.0%
DK47 2.5%
DK48 1.0%
DK800 2.5%
DK46 - DK800
Operating conditions
Temperature
Temperature
TemperatureTemperature
Max. operating temperature TS -5..+100°C / +23...+212°F
Pressure
Pressure
PressurePressure
Operating pressure PS Pressure Equipment Directive 97/23/EC
Test pressure PT Pressure Equipment Directive 97/23/EC
Max. permitted operating gauge pressure PS at TS = 100°C / 212°F:
DK…/R (stainless steel top and bottom fittings ) 10 bar / 145 psig 1
DK…/N (brass top and bottom fittings ) 10 bar / 145 psig 1
DK…/PV (PVDF top and bottom fittings ) 4 bar / 58 psig
Installation conditions
Inlet and outlet None
1 higher pressures upon request
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