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DK 32/34/37 Variable Area Flowmeter
Brand: Krohne
The solid metal DK flowmeters are suitable for measuring liquids and gases. Because of their robust design the flowmeters are particularly suited for difficult operating and environmental conditions.
The extremely compact design and the elimination of inlet and outlet sections allows for simple and cost-effective integration into measuring systems such as process analytics systems.
Variable Area Flowmeters
- Local measurement, setting and monitoring of very low flow rates
- Compact design, no inlet and outlet sections
- High resistance to pressure and temperature
Industries
- Chemical
- Petrochemical
- Oil & Gas
- Mechanical and plant engineering
- Analytics system building
- Compressor and pump technology
- DK32 with horizontal connections - with valve
- DK34 with vertical connections - without valve
- DK37 with a higher measuring accuracy accuracy and larger indication
- Narrow design enabling a high packing density
- Easy installation and commissioning
Specifications
Brand
Accuracy
- Measuring Accuracy for DK32/34: 4 %
- Measuring Accuracy for DK37: 2.5 %
- Switching Reproducibility: < 5 % of Full Scale
Ambient Temperature Range
- DK32/34 HT High-Temperature: -25° to 200° C (-13° to 392° F)
- DK32/34 with Limit Switches SC2-N0 or SJ2-S1N: -25° to 70° C (-13° to 158° F)
- DK32/34/37 without Electrical Built-ins, DK32/DK34 with Limit Switches I7S2002-N or SJ2-SN: -40° to 70° C (-40° to 158° F)
Applications
- Air or Water
- Chemicals & Additives
- Flushing Fluids for Measuring Systems
- Lubricating, Cooling & Anti-Corrosive Agents
- Nitrogen, CO₂ or other Industrial Gases
- Process or Carrier Gases
- Sample Flows for Process Analytics Systems
Approvals & Certifications
- QPS (US, C) IS/I/1/ABCD, T6
Approvals & Certifications
- ATEX (II2 GD C IIC TX), (II2 G Ex ia IIC T6 Gb, II3 G Ex NA IIC T6 Gc - DK32/34), (II2 G Ex ia IIC T6 Gb, II2D Ex ia IIIC T75° C Db - DK37)
- CCOE
- FM (US) (IS/I/1/ABCD,T6), (NI/I/2/ABCD,T6), (S/II, III/2/FG,T6), (IS/I, II, III/1/A-G), (NI/II/2/ABCD) -DK32/34
- IEC Ex ia IIC T6 Gb, Ex ia IIIC T75° C Db - DK37
- INMETRO
- NAMUR NE 21, NE 43, NE 95
- NEPSI
Cable Length
- Approximately 5.6 feet (1.7 metres)
Communication
- HART
Cone Material
- CrNi Steel 1.4404 / 316L
Current
- Pointer Vane Read (Detected) / Not Read (Detected): ≤ 1 mA for DK32/34/37 with Limit Switches
- Pointer Vane Read (Detected) / Not Read (Detected): ≥ 3 mA for DK32/34/37 with Limit Switches
Diameter
- Connecting Cable: Approximately 0.28” (7 mm)
Diaphragm Material
- Carbon Steel
- Graphite-filled PTFE
Differential Pressure
- Minimum psi: 0.73 to 21.8 (kPa: 5 to 150, bar: 0.05 to 1.5)
Distance
- Distance between Device DK32/34: 2.36” (60 mm)
- Distance between Device DK37: 3.94 to 4.73” (100 to 120 mm)
Electrical Connectors
- 1.5 mm²
- 2-Wire
- Cable Gland: M16 x 1.5
- DK37: 2.5 mm²
Electrical Contacts
- SC2-N0 I7S2002-N & SJ2-SN: Normally Closed
- SJ2-S1N: Normally Open
Electrical Rating
- Maximum
- Switching Capacity: 12 VA
Enclosure, Body Material
- 316L Stainless Steel, 1.4404, CF8M
- DK37: 316 Stainless Steel 1.4408 / CF8M
- DK37: Polyphenylene Sulfide (PPS)
Environmental Protection
- DK32/34: IP65
- DK32/34: IP68
- DK37: IP67
- IP66
Flow Rate
- 0.15 L/hr Water
- 1.6 L/hr Air
- Inlet Current Flow Rate: 1,000 L/hr for Air
- Measuring Range: 0.4 to 25 gph (1.5 to 100 L/hr) for Water
- Measuring Range: 0.6 to 130 scfm (16 to 3,400 NL/hr) for Air
- Outlet Current Flow Rate: 800 L/hr for Air
- Valves: 0.018 to 0.48 Kv (m³/hour)
- Valves: 0.021 to 0.552 Cv (GPM)
- Valves: Max.
Gasket Material
- Gasket of Dosing Unit: EPDM
- Gasket of Dosing Unit: FFKM
- Gasket of Dosing Unit: fpm/PTFE
- Gasket of Dosing Unit: PTFE
Length
- Standard Length for DK32/34 & Valve Bottom for DK37: 9.8” (250 mm)
- Valve Bottom: 9.8” (250 mm)
- Valve Top: 11.8” (300 mm)
Load
- DK37: Min. Load for HART: 250 ohms
Load Resistance
- DK37: Max.
Materials of Construction
- Float, Top Fitting, Bottom Fitting: 316L Stainless Steel (CrNi Steel 1.4404)
- Float: Titanium
NPT Connection
- 1/4” NPT Female
O-Ring Material
- FFKM
- FPM
Operating Pressure
- Maximum
Operating Pressure - Sensor
- Standard Version - Max.
Operating Temperature - Sensor
- Standard Version - 0° to 150° C (32° to 302° F) - Max.
Output
- DK37: 4-20 mA
Plug Material
- Gasket of Screw Plug: PTFE
- Screw Plug: CrNi Steel 1.4404 / 316L
Power Supply
- DK37: 14-30 Vdc
- DK37: Min. Power Supply for HART: 20.5 Vdc
Power Supply Effect
- DK37: Power Supply Influence: < 0.1 %
Pressure Drop
- psi: 0.21 to 2.44 (kPa: 1.4 to 16.6, Mbar: 14 to 166) - Pressure Loss
Pressure Range
- barg: 0 to 130
- kPa: 0 to 13,000
- psig: 0 to 1,885
Pressure Type
- Absolute
- Gauge
Principle of Operation
- Float Measuring Principle
Process Temperature
- 20° C (68° F) - for Water, Air
Proof Pressure
- Maximum
Size
- Clamping Range for DK32/34: 0.18 to 0.4” (4.5 to 10 mm)
- Clamping Range for DK37: 0.12 to 0.28” (3 to 7 mm)
Stem Material
- Valve Stem: CrNi Steel 1.4404 / 316L
Temperature Effect
- Temperature Influence: < 10 µA/K
Temperature Range
- DK32/34 HT High-Temperature with FFKM: Max.
- DK32/34/37 without Valve: Max.
- DK32/37 with Valve fpm / PTFE or FFKM: Max.
- DK32/37 with Valve PTFE or EPDM: Max.
- Product Temperature: 150° C (302° F)
Voltage
- Nominal Output Voltage: 8 Vdc
The devices are particularly suitable for the measurement of small quantities of:
- Process or carrier gases
- Nitrogen, CO2 or other industrial gases
- Sample flows for process analytics systems
- Flushing fluids for measuring systems
- Air or water
- Chemicals and additives
- Lubricating, cooling and anti-corrosive agents
