Krohne Variable Area Flowmeter, DK 32/34/37
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DK32 / DK34 / DK37

Series: DK 32/34/37 Variable Area Flowmeter Brand: Krohne
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Krohne Variable Area Flowmeter, DK 32/34/37 Krohne Variable Area Flowmeter, DK 32/34/37 Krohne Variable Area Flowmeter, DK 32/34/37
  • Product - With Valve & Horizontal Connection
  • Pressure Regulator - Inlet Pressure Regulator
  • Limit Switches - One Limit Switch
  • Connector - Plug Connector
  • Temperature - High Temperature Version
  • Limit Switch Type - Limit Switch EC Type-Tested
  • Agency Approvals - Explosion-Protected Equipment
  • SIL - SIL2 Compliance of Limit Switches According to IEC 61508

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 meters)

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/hour Water
  • 1.6 L/hour Air
  • Inlet Current Flow Rate: 1,000 L/hour for Air
  • Measuring Range: 0.4 to 25 gph (1.5 to 100 L/hour) for Water
  • Measuring Range: 0.6 to 130 scfm (16 to 3,400 NL/hr) for Air
  • Outlet Current Flow Rate: 800 L/hour for Air
  • Valves: 0.018 to 0.48 Kv (m³/hour)
  • Valves: 0.021 to 0.552 Cv (GPM)
  • Valves: Maximum

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: Minimum Load for HART: 250 ohms

Load Resistance

  • DK37: Maximum

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 - Maximum

Operating Temperature - Sensor

  • Standard Version - 0° to 150° C (32° to 302° F), Maximum

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: Minimum 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: Maximum
  • DK32/34/37 without Valve: Maximum
  • DK32/37 with Valve fpm / PTFE or FFKM: Maximum
  • DK32/37 with Valve PTFE or EPDM: Maximum
  • Product Temperature: 150° C (302° F)

Voltage

  • Nominal Output Voltage: 8 Vdc

Documentation

Data Sheets

View Product Series

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