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  1. Calibration services
  2. Calibration verification certificates | flow

Calibration of flow sensors

ISO calibration flow (water)

The reference measurement of flow sensors for the measurement of liquids is done with a reference device.

During the reference measurement, the medium flows through the measuring instrument to be calibrated and another reference device that has been calibrated beforehand. Often, reference Coriolis flow meters are used, as their measuring principle allows them to measure a temperature- and pressure-independent mass flow rate, which results in them having very high ranges of accuracy.

The calibration is performed on the basis of 3 or 4 measurement points, which are distributed over the flow range. Usually, the calibration points are at 10%, 25%, 50% and 100% of the associated measuring range. As a rule, calibrations of water flow sensors end at a value of 600 l/min. This needs to be taken into account particularly for devices with higher measuring ranges. By default, the calibration is performed with factory settings using the analog output (current) or, alternatively, visually using the display of the device or the analog output (voltage).

ISO calibration verfication for SM2/6/7/8/9 flow sensors (Part no. ZC0052)

  • Fee charged.  One certificate per sensor required.
  • Calibration performed in accordance with DIN EN ISO 9001:2015 by ifm’s US calibration lab, traceable to national standards such as PTB or NIST.
  • Languages: German/English.
  • Applies to the specified article(s) and must be ordered with the sensor.  It cannot be generated after the sensor has been delivered.
  • For new purchases only. We do NOT offer recalibration services for sensors that have been in service.
  • Available for SM magmeters except SM6x2x, SM7x2x, SM8x2x and SMFxxx. See below for certifcates for other SM models.

ISO calibration verfication for SM6x2x, SM7x2x, and SM8x2x flow sensors (Part no. ZC0054)

  • Fee charged.  One certificate per sensor required.
  • Calibration performed in accordance with DIN EN ISO 9001:2015 by ifm’s US calibration lab, traceable to national standards such as PTB or NIST.
  • Languages: German/English.
  • Applies to the specified article(s) and must be ordered with the sensor.  It cannot be generated after the sensor has been delivered.
  • For new purchases only. We do NOT offer recalibration services for sensors that have been in service.

ISO calibration verfication for SMFxxx flow sensors (Part no. ZC0114)

  • Fee charged.  One certificate per sensor required.
  • Generated by ifm's calibration lab.
  • Languages: German/English.
  • Applies to the specified article(s) and must be ordered with the sensor.  It cannot be generated after the sensor has been delivered.
  • For new purchases only. We do NOT offer recalibration services for sensors that have been in service.

ISO calibration flow (air)

The comparative measurement of compressed air meters is performed on the basis of critical nozzles.

During the calibration by means of supercritical pressures in de Laval nozzles, the measuring medium is drawn in at atmospheric conditions to accelerate the flow rate so that it reaches the speed of sound at the smallest diameter of the nozzle.When this critical flow condition is reached, the flow rate is limited to a constant value.

The calibration is performed on the basis of 6 measurement points, which are distributed over the flow range.As a rule, calibrations of compressed air and industrial gas meters end at a value of 700 Nm³/h. By default, the calibration is performed with factory settings using the analog output (current) or, alternatively, visually using the display of the device or the analog output (voltage).

ISO calibration verification for SD2/5/6/7/8/9  flow sensors (Part no. ZC0020)

  • Fee charged.  One certificate per sensor required.
  • Generated by ifm's calibration lab.
  • Languages: German/English.
  • Applies to the specified article(s) and must be ordered with the sensor.  It cannot be generated after the sensor has been delivered.
  • For new purchases only. We do NOT offer recalibration services for sensors that have been in service.
  • Only available for SD compressed air flow meters.