Measuring tube type

K

Wide U-shaped sensor type

Wide U-shaped profile (K) — measuring tubes with an increased bend radius, designed for operation under high and ultra-high pressure — up to 96 MPa. Sizes DN02–DN25 (002..K–025..K). Optimized for measuring the flow of hydrogen, helium and nitrogen.

Technical specifications Request a quote
Up to 96 MPa Turndown up to 100:1 H₂ / He / N₂ High sensitivity
Wide U-shaped measuring tubes of Mass-EXPERT
Overview

Wide U-shaped sensor type (K)

The wide U-shaped profile reduces mechanical stress in the tube walls, which allows high pressures to be withstood without loss of sensitivity. The design is successfully used in hydrogen energy, high-pressure gas refueling systems and chemical processes.

DN02–DN25
Sizes 002..K–025..K
up to 96
MPa — maximum pressure
100:1
Turndown ratio
H₂ / He / N₂
Hydrogen, helium, nitrogen

Key advantage

Operation at pressures up to 96 MPa with high sensitivity — ultra-high pressure version.

Advantages of the wide U-shaped profile

High sensitivity — at low flow rates of hydrogen, helium and nitrogen
Resistance to high pressure — up to 96 MPa
Stability in pulsating mode — refueling and dosing of high-pressure gases
Low sensitivity to vibrations — symmetrical design with counter-phase oscillations
Compatibility with aggressive media — materials per the Mass-EXPERT material range (316L, high-Ni 316L, 904L, titanium, C4 steel, Hastelloy, duplex, tantalum)
Minimization of temperature deformations — stable tube geometry

The K-type is supplied with ME100, ME200 or ME300 transmitters. For high (P) and ultra-high (PK) pressure versions, materials resistant to hydrogen embrittlement are used; high-pressure connections are available.

Recommended applications

Hydrogen energy Helium systems Nitrogen stations Chemicals Oil & gas sector
Sensor types

Other measuring tube types

Mass-EXPERT offers several measuring tube configurations, each optimized for specific operating conditions

U V K W L Δ (Delta)

The K-type (wide U-profile) is optimized for high and ultra-high pressure.

Technical specifications

K-type sensor parameters

Technical specifications of Mass-EXPERT flow meters with a wide U-shaped tube profile

Parameter Value
Measuring tube type K — wide U-shaped profile
Nominal diameter (DN) DN02–DN25 (002..K–025..K)
Maximum working pressure up to 90 MPa (96 MPa — only 003..PK)
Turndown ratio up to 100:1
Recommended media Hydrogen, helium, nitrogen, other high-pressure gases
Measuring tube materials 316L, high-Ni 316L, 904L, titanium, C4 steel, Hastelloy, duplex, tantalum — per the Mass-EXPERT material range (selection by medium)
Transmitters ME100, ME200, ME300
Output signals 4–20 mA (HART), RS-485 (Modbus RTU), CAN, pulse, frequency
Explosion protection Ex db ib IIC T6 Gb; Ex db ia IIC T6 Gb; Ex ia tb IIIC T80 °C Db
Protection rating IP66, IP67
Model Nominal diameter Maximum flow rate, kg/h
Mass-EXPERT-002..K DN02 96
Mass-EXPERT-003..K DN03 150
Mass-EXPERT-004..K DN04 300
Mass-EXPERT-008..K DN08 1 200
Mass-EXPERT-015..K DN15 1 800
Mass-EXPERT-025..K DN25 5 400

Maximum pressures by size are set by the version (T — up to 10 MPa; P/PK — per the tables; 96 MPa — only for 003..PK).

Type comparison

Sensor configuration comparison

K-shaped type — the high and ultra-high pressure solution

Parameter UVKWLΔ (Delta)
Nominal diameter (DN) DN03–DN250DN08–DN50DN02–DN25DN08–DN100DN08–DN50DN01/DN02/DN25
Unique feature • versatility: most media and industries
• cryogenic and high-pressure versions		• face-to-face replacement without rework• ultra-high pressure (PK series)
• H₂-embrittlement-resistant materials		• self-draining + CIP/SIP
• large line sizes (up to DN100)		• minimal hydraulic resistance
• abrasives, slurries and viscous products		• micro-dosing from fractions of kg/h
• exceptional mechanical stability
Straight pipe runs required NoNoNoNoNoNo
Low flow rates and micro-dosing from DN03from DN08from DN02from DN08from DN08fractions of kg/h (from DN01)
Sensitivity HighHighHighMediumMediumVery high
Compactness MediumHighMediumHighMediumMedium
Aggressive media GoodGoodGoodGoodExcellentGood
Drainage and dead zones StandardStandardStandardFull (self-draining)Full (straight tubes)Standard
Vibration and pulsation resistance HighHighHighHighStandardMaximum
Hygienic cleaning (CIP/SIP) YesYesYesYesYesYes
Sanitary connections YesYesYesYesYesYes
Recommendation Universal solution for most tasksDirect replacement of installed equipmentHigh and ultra-high pressure (H₂, He, N₂)Self-draining designViscous, abrasive, aggressive and hygienic mediaMicro-flow (DN01/DN02), also DN25
Applications

Recommended applications

Application area Description
Hydrogen energy High-pressure H₂ refueling, dosing, custody transfer
Helium systems Helium flow measurement at high pressure
Nitrogen stations High-pressure nitrogen metering, nitrogen fire suppression systems
Chemicals Aggressive media, pressure up to 90 MPa (96 — only 003..PK), pulsating flows
Oil & gas sector High-pressure gas and liquid lines, reagent injection systems
Applications

Where it is used

Hydrogen energy
Cryogenic technologies
Chemicals
Oil & gas

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