Non-Contact Mounting & Installation Guidelines
Mounting of Non-Contact Level Sensors
The sensor must be installed on the top of the vessel and must be positioned to ensure that the sensor face has an unobstructed line of sight to the "empty" level of the tank. (Ultrasonic Sensors will not operate in a vacuum.)
To calculate the minimum distance from the wall for sensor placement, use:
Minimum Distance From Wall = Tangent (Beam Angle/2) (Tank Height)
The best echo is obtained when the sensor diaphragm is parallel to the surface of the material being monitored. Make sure that the material does not encroach into the dead zone (ultrasonic sensor).
In tanks with dome tops, the sensor should not be installed in the center. Place it 2/3 of the way between the wall and the center line.
Do not attempt to measure through the filling curtain. Make sure that the material or product does not encroach into the dead zone.
Avoid interference from the side of the tank or from obstructions inside the vessel. Do not install the sensor at an angle.
In tanks with domed tops, aim the sensor to point toward the discharge hole.
Installation of Non-Contact Level Sensors
Mounting the sensor correctly is critical to its proper operation. Refer to instruction manual for wiring information.
The ultrasonic sensor can be mounted directly by threading it into a 2" NPT plastic or metal mounting flange with the sensor face below the flange and pointing down, without making contact with any surface.
The radar sensor can be mounted directly by threading it into a 2" NPT metal mounting flange with the antenna pointing down. The radar sensor must be installed in a metal flange. If a still-pipe is required, it must be metal as well.
Metal Standpipe Mounting
Both ultrasonic and radar sensors can be installed utilizing a metal still-pipe. Plastic may also be used for ultrasonic.
|Pipe Diameter (Radar models*)||Maximum Length|
|4.0" and 5.0"||6.0"|
If your mounting material or configuration does not comply with these notes, please consult Madison Company for proper interface.
* For metal still-pipes that have a small ID and that are longer than 4" in this table, use 6" or 8" antenna extensions that are equal to or longer than the still-pipe.