Measuring tube type

L

Straight-tube sensor type

A bend-free design — the optimal solution for media with high viscosity, abrasive particles, aggressive properties, or products sensitive to mechanical impact.

Technical specifications Request a quote
DN08–DN50 Turndown up to 100:1 No stagnant zones Minimum hydraulic resistance CIP/SIP 3-A hygienic design
Straight measuring tubes of Mass-EXPERT
Overview

Straight-tube sensor type (L)

The straight-tube design (L) uses bend-free measuring tubes that ensure unobstructed product passage without stagnant zones. This configuration is the optimal solution for media with high viscosity, abrasive particles, aggressive chemical properties, as well as for products sensitive to mechanical impact. Straight tubes also provide minimum hydraulic resistance and ease of cleaning.

DN08–DN50
Nominal diameter range
100:1
Turndown ratio
Ra ≤ 0.8
Roughness, µm (3-A)
CIP/SIP
Hygienic cleaning
Advantages

Why choose the straight-tube type (L)

The straight-tube design of the measuring tubes is an engineering solution that removes the limitations inherent in bent sensors for specific operating conditions.

Minimum pressure loss

The straight tube geometry creates no additional hydraulic resistance, which is especially important for high-viscosity media and systems with limited pump head.

Ease of cleaning

The absence of bends and pockets ensures complete drainage and efficient cleaning. Ideal for production with frequent product changes (CIP/SIP cleaning).

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Abrasion resistance

Particles in suspensions and slurries do not strike the walls of bends with increased force, which significantly reduces erosive wear and extends sensor service life.

Union connection

The compact union design (Tri-Clamp, union nut thread) simplifies integration into existing pipelines, especially in food and pharmaceutical lines. Installation and removal require no welding.

Aggressive media

Straight tubes made of corrosion-resistant materials per the Mass-EXPERT material range (high-Ni 316L, 904L, Hastelloy, titanium, etc.) ensure reliable operation with acids, alkalis and aggressive reagents.

3-A hygienic design

Internal surface roughness Ra ≤ 0.8 µm, no crevices or sharp transitions — full compliance with the 3-A Sanitary Standards for food equipment.

Industries

Recommended industries

The Mass-EXPERT straight-tube sensor type is recommended for a wide range of industries that require handling viscous, abrasive, aggressive or mechanically sensitive products.

Oil & gas

Measurement of fuel oils, bitumen and high-viscosity petroleum products. Straight tubes ensure free passage of heavy media without clogging.

Fuel oils, bitumen, tars, high-viscosity petroleum products

Cement industry

Handling of suspensions, milk of lime and mineral slurries. Abrasion resistance is a key advantage.

Suspensions, milk of lime, mineral slurries

Chemicals

Measurement of acids, alkalis, paints, polymers and abrasive reagents. Corrosion resistance and absence of stagnant zones.

Acids, alkalis, paints, polymers, abrasive reagents

Food & pharmaceutical industries

Measurement of chocolate, pastes, sauces, syrups and other products sensitive to mechanical action. 3-A hygienic design.

Chocolate, pastes, sauces, syrups
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)

L — straight-tube type optimized for viscous, abrasive and aggressive media and products sensitive to mechanical action. Recommended for food, pharmaceutical and chemical production facilities.

Technical specifications

Straight-tube sensor parameters (L)

Technical specifications of Mass-EXPERT flow meters with straight measuring tubes

Parameter Value
Measuring tube type L — straight-tube (no bends)
Nominal diameter (DN) from 8 to 50
Number of tubes 2 (two parallel straight tubes)
Connection types Flanged, coupling connections: Tri-Clamp (clamp); union nut thread
Measuring tube material Stainless steel AISI 316L (standard); high-Ni 316L, 904L, titanium, C4 steel, Hastelloy, duplex, tantalum (optional — per the Mass-EXPERT material range)
Internal surface roughness Ra ≤ 0.8 µm (3-A Sanitary Standard)
Maximum working pressure up to 10 MPa
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
Hygienic cleaning CIP (Clean-in-Place) / SIP (Sterilize-in-Place) — fully compatible
Size Maximum flow rate, kg/h
DN081 200
DN153 600
DN2512 000
DN4027 000
DN5039 000
Type comparison

Sensor configuration comparison

Straight-tube type (L) — the optimal solution for aggressive, viscous and abrasive media

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

Where it is used

Oil & gas
Chemicals
Pharmaceuticals
Food & beverage
Polymer production
Dosing & blending systems

Typical application media

The straight-tube Mass-EXPERT sensor is recommended for a wide range of industrial media, especially where minimal hydraulic resistance, abrasion resistance and hygienic design are required.

Fuel oils & bitumen Acids & alkalis Cement slurries Chocolate & pastes Sauces & syrups Paints & polymers 🪨 Mineral slurries Pharmaceutical products Abrasive reagents Milk of lime CIP/SIP cleaning Dosing of viscous media

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