Germany Original Krohne Dk32 / Dk34 / Dk37 Variable Area Flowmeter
Introduction
The DK32/34 is a variable area (VA) flowmeter for measuring low
flow rates of liquids and gases. The tried and tested meter is
particularly suitable for flow monitoring and dosing in gas
analyser systems or on purge panels. Due to its robust all-metal
design it can also be used in difficult process conditions with
temperatures up to +200°C / +392°F or pressures up to 400 barg /
5800 psig. It is available with a metering valve as standard to
accurately set the flow value.
The DK32/34 operates without auxiliary power supply. It features a
local indication with optional MIN/MAX limit switches (NAMUR), a
reed contact or analogue output (4...20 mA). To provide constant
flow rates in case of variable inlet or outlet pressures, the VA
meter is also available with flow regulators. It comes with
horizontal or vertical process connections for NPT or G thread,
flange adapters and many other connection options. The VA meter has
various approvals for hazardous areas and is suitable for use in
Safety Instrumented Systems (SIS).
Krohne DK32/34 Variable area flowmeter for liquids and gases
Specification
Compact mechanical indicator, optional 4…20 mA/HART®7, MIN/MAX
switches and needle valve
Sturdy metal design: stainless steel or alloy
Thread: G1⁄4, 1⁄4 NPT; others
-40…+200°C / +392°F, max. 220 barg / 3190 psig
Simple, low-cost installation: Able to measure and display without
auxiliary power supply
Purgemeter with 2 optional limit switches for flow monitoring
Various stainless steel and alloy sensor materials
Optional surface passivation with SilcoNert 2000 for trace-level
analysis
Ingress protection IP65/66
Full scale value for liquids: 1.6…150 l/h / 0.4…40GPH
Full scale value for gases: 16…4,800 l/h / 0.6…170 SCFH
Turndown ratio 10:1
Accuracy: ±4% (acc. to VDI/VDE 3513, sheet 2)
SIL2 compliant for use in Safety Instrumented Systems (SIS)
Approved for hazardous areas
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Performance characteristic
DK32 inlet pressure regulator
The DK 32 can be directly connected to a pressure regulator to
ensure constant flow rate despite operating pressure fluctuations.
DK32 horizontal connection - with valve; DK34 vertical connection - no valve available
The position of the float is transmitted by magnetic induction to
an analog indicator showing its measured value. No power supply required.
Product features
● Low cost, simple measuring principle, no auxiliary power supply
● Measuring tube material: standard 316L; Special according to user requirements
● Handling temperature -80°C to +150°C
● Working pressure up to 130bar
● Liquid measurement range: 1.6 to 160L /h(water: 20°C)
● Gas measurement range: 16 to 4,800 L /h(air: 20°C,1.013bar)
● Two limit switches are available
● Measurement accuracy (according to VDI/VDE3513 Ver2) : 4.0
● Protection class IP66/68(IP65 with limit switch)
● Multiple connection modes
Application areas:
• Filter monitoring air flow rate
• Blower vacuum detection
• fan pressure indicator
• Pipe room or building pressure
• clean room positive pressure indicator
