1. Introduction

To give the best performance, KROHNE flowmeters must be installed in a correct way. Important instructions should be taken into consideration, like the inlet and outlet length, pipe to be completely filled, direction of the flow, etc. Depending on the measuring principle of each device, the guidelines will differ. In this article we will explain the installation instructions for Inline Ultrasonic flow meters for gas measurements.


The article cover the following topics:


  • Recommended installation positions for OPTISONIC 7300
  • Recommended installation positions for OPTISONIC 8300


2. OPTISONIC 7300

  • The OPTISONIC 7300 is designed for the measurement of dry gas flow. Excess of liquids may disturb the acoustic signals and should thus be avoided.
  • Install the flow sensor in a horizontal position in a slightly descending line and make sure to orientate the flow sensor such that the path of the acoustic signal is in the horizontal plane.
  • Keep a free space of 1 m / 39" around the transducer in case of exchanging the transducers.
  • Upstream of the flowmeter at least 20 DN (the diameter of the measuring tube) must be left in case of 1 path and 10 DN only in case of 2 path. 
  • The outlet runs must be at least 3 DN.
        

  •  After a T-piece that is when two pipes intersect, a 10 DN inlet run must be used.
  • To avoid distorted flow profiles and interference caused by valve noise in the sensor, control valves or pressure reducers should not be installed in the same pipeline as the flowmeter. In case this is required, please contact the manufacturer.


  • Make sure to mount the device vertically or horizontally with the acoustic path in horizontal plane.


     


  • Avoid vibrations on the line.


3. OPTISONIC 8300:

  • Install the flow sensor in a horizontal position in a slightly descending line.
  • Do not install the flow sensor in a lowered pipe section to avoid that water can collect in the measuring tube.
  • Orientate the flow sensor such that the path of the acoustic signal is in the horizontal plane.
  • Keep a free space of 0.3 m / 11.81" around the transducer in case of exchanging the transducers.
  • Upstream of the flowmeter at least 20 DN (the diameter of the measuring tube) must be left as the inlet run and 3 DN atleast as outlet run.



  •  After a T-piece that is when two pipes intersect.  A 20 DN inlet run must be used.


  • Make sure to mount the device horizontally with the acoustic path in horizontal plane.
        
  • To avoid distorted flow profiles and interference caused by valve noise in the sensor, control valves or pressure reducers should not be installed in the same pipeline as the flowmeter. In case this is required, please contact the manufacturer.