Kem Kuppers SRZ ST Helical Flow Meter


With more than 50 years of experience in the flow measurement field and numerous innovative and customer specific product developments, we are a qualified and competent contact for flow measuring technology and calibration.

KEM offers a broad selection of measuring principles for this purpose. We develop, produce, and deliver high quality Gear Flow Meters, Turbine Flow Meters, Helical Flow Meters and Micro Flow Meters as well as Coriolis Mass Flow Meters worldwide. Specific accessories complement the product range. This document provides information, technical details and typical applications concerning the SRZ ST HelicalFlow Meter Series.


Kem Kuppers SRZ ST Helical Flow Meter (tungsten carbide sleeve bearing design) are flow-measuring devices that are used mainly in high-viscosity, abrasive, filled as well as lubrication and non-lubrication media. These include polyurethane, polymers, and viscous products, as well as all kinds of greases and oils.

Thanks to its concept, temperature fluctuations and the resulting change in the viscosity of the medium only marginally affect the measuring accuracy of the SRZ ST. This makes it especially well suited for use in test stands and for measurements with changing application conditions. Furthermore, the helical flow meter is distinguished by a wide measuring range, low shear stress of the medium to be measured, and low loss of pressure.

Only high-grade steels that even withstand corrosive liquids are used in the production of helical flow meters. Combined with the use of tungsten carbide bearings, the SRZ ST guarantees optimum measurement accuracy and a long service life even under the toughest application conditions.

Short response times, very dynamic performance and high measurement accuracy ensure accurate regulation and control of flow rates in demanding applications.

For applications in hazardous areas, we offer intrinsically safe sensors and amplifiers with Ex protection in accordance with ATEX, IECEx, CSA and other standards. Additional certifications such as EAC (TR-CU) are available.

Principle and Design

  • Two cycloidal helical spindles with geometrically lapped profiles that interlock with high precision lie in a cylindrical housing. This creates enclosed measuring chambers between the spindle profiles and the wall of the housing. These transport the medium being measured.
  • The medium is forcibly guided and flows through the measuring chamber bores in the axial direction, causing the spindles to rotate. This process is pulsation-free with minimum leakage. A contactless frequency measuring
    element with a high-speed pulse wheel captures the rotational speed of the spindle pair through the housing wall.
  • The rotational speed of the spindles is exactly proportional to the volume flow over a very wide range. Impulses per unit of volume are available for the analysis.
  • The calibration factor of the Helical Flow Meter describes the exact pulse rate per unit of volume. In order to determine the individual calibration factor of a flow meter, each of our meters is internally calibrated by us prior to delivery.
  • The operating viscosity specified by the customer is taken into account for calibration. A corresponding calibration certificate is included with every flow meter we supply


  •  Polyurethane and polymer
  • Adhesives and sealants
  • nsulation materials and coatings
  • Light and heavy fuel oil
  • Petrochemical products
  • Different fats and oils with varying viscosities
  • Hydraulic test rigs with varying vis

Kem Kuppers SRZ ST Helical Flow Meter Features

  • High measuring accuracy up to ±0.1%1)
  • Exceptional repeatability of ±0.05%
  • Measuring range up to 1:100
  • Short response times
  • Pressure-resistant up to 315 bar [4,500 psi]
  • Argely independent of viscosity, perfect for 1 to 1×106 mm²/s
  • Low pressure drop compared with other positive displacement meters
  • High resolution
  • Pulsation-free measurement, non-sensitive to pulsating flows
  • Resistant to corrosion by advanced materials and bearings

Technical Data – Sizes

  • SRZ Model  SRZ 40
    • Measuring Range (l/min) : 0.4 to 40
    • K-Factor3)  (pulses/l) :  3,500 315 [4,500] 250 [3,600]
    • max. Pressure (bar/psi)
      • Bolts ISO 4762 : 315 [4,500]
      • BoltsA4-70 : 250 [3,600]
    • Frequency3)  (Hz) : 20 to 2,350
    • Weight (kg) : 6.2
  • SRZ Model  SRZ 100
    • Measuring Range (l/min) : 1.0 to 100
    • K-Factor3)  (pulses/l) : 850
    • max. Pressure (bar/psi)
      • Bolts ISO 4762 : 250 [3,600]
      • BoltsA4-70 : 250 [3,600]
    • Frequency3)  (Hz) :14 to 1,450
    • Weight (kg) : 15.0
  • SRZ Model  SRZ 400
    • Measuring Range (l/min) : 4.0 to 400
    • K-Factor3)  (pulses/l) : 214
    • max. Pressure (bar/psi)
      • Bolts ISO 4762 : 200 [2,900]
      • BoltsA4-70 : 200 [2,900]
      • Frequency3)  (Hz) : 14 to 1,450
    • Weight (kg) : 34.0

Kem Kuppers SRZ ST Helical Flow Meter Specifications

  • Measuring Ranges: 0.4 up to 400 l/min
  • Measuring Accuracy: up to ±0.1 %
  • Repeatability: ±0.05 % (under the same conditions)
  • Linearity: up to ±0.25 % of actual flow
  • Materials:
    • Housing: as per DIN 1.4305 [AISI 303], 1.4404 [AISI 316L]
    • Helicals: as per DIN 1.4122
    • Bearing: tungsten carbide
    • Seals: FKM, PTFE (others on request)
  • Pressure: up to 315 bar [4,500 psi]
  • Medium Temperature: -40 °C up to +150 °C [-40 °F up to +302 °F] (others on request)


  • In-house calibration is performed on volumetric calibration rigs or at the wishes of the customer in our DAkkS calibration laboratory.
  • The KEM calibration lab uses a high-precision load cell system. With an accuracy of 0.05 % for the mass and 0.1 % for the volume of flowing liquids, we occupy a leading position worldwide. The German Accreditation Body (DAkkS) has accredited the laboratory with engineers, processes and measuring equipment in accordance with the international standard DIN EN ISO/IEC 17025:2018.
  • The KEM calibration certificate not only verifies the accuracy of a flow meter, but also guarantees its traceability to national standards as well as ensuring all requirements according to international quality standards are met.
  • The calibrations are performed with different hydrocarbons. This ensures the optimum simulation of changing operating conditions in density and viscosity even when temperatures change. This way the primary viscosity for the use of the flow meter can be specifically taken into account when viscosity fluctuations occur in a customised application.
  • The calibration result is the specified calibration factor (K-factor) in pulses per litre. This K-factor accordingly applies only at a certain flow velocity or a certain flow rate.
  • The calibration factor varies only very slightly at different volume flow rates. The individual measuring points provide the calibration curve of the flow meter from which the average K-factor is determined. The average calibration factor applies to the entire measuring range.
  • The linearity error specification (percentage deviation) refers to the average K-factor. To further increase the measurement accuracy in onsite use, the specific K-factors can be used to calculate the flow rate. For this, KEM also supplies optional special electronics.

Download : Datasheet

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