The level transducers of the PCS III series are rugged, accurate, without mechanical wear between the measuring probe and the float, they are resistant to shock and vibrations and are equipped with protection against hostile environments.
They are absolute measure transducers – of a magnetostrictive type – with measuring ranges from 100 to 3,000 mm, which measure the position of the magnetic float compared to the probe in a fluid digitally and continuously with no friction or wear between the parts. The measuring probe, that is 10 mm in diameter, is made of AISI316L stainless steel with TIG welding, in order to make it possible to be used in the most severe operating conditions, in pharmaceutical, food or chemical applications, with working pressures in the area of 350 bar and peaks up to 700 bar.
There is a dead zone on the measuring probe near the tip of 55 mm – for measurement purposes – as per the design. Normally this area is comprised within the float (AFC models 2S, 4S, 6S, 10S or 12S), and should be taken into account when using the AFC-8S float. It is possible upon request to provide the measuring probe of the transducer with a restraint system of the float that avoids removal. This can be an accessory that is added to the outside of the standard probe (height 9 mm) or can be integrated into the tip of the measuring probe, increasing its length by 10 mm.
It is possible to configure the unit to measure the position of multiple floats, such as when measuring water and oil or diesel and water levels in a tank. It is also possible – after checking the utilizations conditions – to operate the transducer with the float that runs parallel to the measuring probe as when it is inserted into a bypass of a sealed circuit, presuming a constant distance between the float and the measuring probe and certain and verified magnetic characteristics of the float.
The transducer is fixed to the tank by means of a threaded M18 x 1.5 nipple to which the measuring electronics is connected, with the possibility of a connection to the control electronics by means of a cable or connector.
The position measurement is available as digital data in the calibration units – via a RS485 connection with a Modbus, or CANopen protocol – or as an analog signal (voltage or current).
The transducer is supplied already calibrated as per the order, but can be customized by means of the digital connection by accessing the internal data structure in order to adapt the operation to the application – for example, in order to align the analog signal end references with the level variation range involved, or to reverse the unit’s direction of measurement with respect to the built-in measuring head. It is also possible to obtain the position/level measurements with centimeter resolution, with the digital connection, in addition to knowing the diagnostic situation. Should the digital connection not be permanently used, the diagnostic status of the transducer can be detected in a simplified way through two LEDs inside the unit with appropriate on / off / flashing codes indicating the absence of the float from the measuring probe, the presence of a problem with the analog output connection, etc.
It is possible with the digital connection, to customize the unit with a linearization table in order to convert the measurement of the float position in volume, whenever the transducer is immersed in irregularly shaped tanks, or it is possible to activate a filtering function that minimizes the effect of possible waves on the measurement.
A software tool for Windows ® is available for carrying out simple measurement functions, to customize the analog output, to enter the characterization points of the linearization table or to view the diagnostic status of the unit.
The transducers of the PCS III series are CE marked, they have passed EMC tests and are also available in an explosion-proof case.