Electromagnetic Flowmeter for Fiscal and Custody Transfer

The SGM-100 utilizes two transducers which work as ultrasonic transmitters and receivers. They are clamped on the outside of a closed pipe at a specific distance from each other. They can be mounted in a V position (the sound crosses the pipe twice), in a W position (the sound crosses the pipe 4 times) or in a Z position (mounted on opposite sides of the pipe – the sound crosses the pipe once). The selection of the mounting position depends on the pipe and liquid characteristics.

The SGM-100 operates by alternately transmitting and receiving a frequency modulated burst of sound energy between the two transducers and measuring the transit time that takes the sound to travel between them. The difference in measured transit time is directly and exactly related to the velocity of the liquid inside the pipe.

Yes, ultrasonic clamp-on flowmeters can be used to measure the flow of a wide range of electrically conductive and non-conductive liquids.

It is possible to select the pipe material and lining type in the instrument menu.

The working of these meters is based on Faraday’s Second Law of Electromagnetic Induction. It states that, a conductor moving in a magnetic field with the direction of its motion perpendicular to the magnetic field generates an EMF across it and the direction of the EMF is perpendicular to both, the magnetic field and the direction of motion. The generated EMF is proportional to the magnetic flux density, B, the velocity of conductor v and the length of the conductor l. In the flow meter the magnetic field is generated by exciting the coils and the conductor is the liquid itself, under measurement with the length equal to the diameter of pipe.

The pipe not completely full during operation, Entrained air in the liquid, Pulsating flows, Grounding issues which can include: PVC or internally lined pipe with no grounding rings used, Faulty ground connection

Grounding rings are stainless steel rings with an internal diameter matching the magflow meter ID. If required a pair of grounding rings are required, one on the inlet side and one on the outlet side of the meter body between the flange mountings. Gaskets are required on both sides of each grounding ring.

Grounding rings are required when the piping material is not electrically conductive, such as PVC or cement lined ductile iron pipes. A wire connection must be made to both grounding rings and to the meter body flanges.

Yes, it is always recommended to use gaskets to ensure a good seal to the flange connections. If grounding rings are used then gaskets are a must.

Yes, it is possible to use the Smag flowmeter which has a Stainless Steel 304 body and either a DIN or clamp process connection.

Yes, Ultrasonic level transmitters can also be used for Open channel flow measurement.

Ultrasonic measurement provides a non-contacting technology for distance measurement which can be configured to provide accurate continuous measurement of product depth / height. Ultrasonic measurement provides maintenance free height or depth measurement of solids, chemicals and water, from food ingredients to corrosive chemicals, waste water and sewage. As this technique makes no contact with the material, there is no on-going cleaning, wear or maintenance schedule.