Two vibrating fork, or vibronic, level instruments have recently been released.

The instruments can be used to detect the point level of liquids in storage tanks, containers and pipes. They also provide proof test, verification and Industrial Internet of Things (IIoT) functionality.

The instrument’s vibronic sensor is not affected by changing media properties, flow, turbulence, gas bubbles, foam, vibration or build-up. The instrument works in process temperatures of -50 °C to 150 °C and pressures up to 1 450 psi. In addition, it can be used in Safety Intergrity Level 2 (SIL2) and SIL3 hazardous locations and has built-in automatic maintenance and verification functions.

The Endress+Hauser Liquiphant FTL51B point level instrument features Industry 4.0 and IIoT capabilities, including access via wireless Bluetooth technology, automatic proof tests and verification, as well as commissioning via a mobile device. In addition, operational clarity is provided by a high-visibility light-emitting diode.

The general-purpose FTL41 is similar to the FTL51B, but works at lower pressures, up to 580 psi and with a narrower temperature range of -40 °C to 150 °C.

Both perform proof tests, with the FTL51B meeting SIL and Water Resources Act requirements. The proof test can be activated remotely at a control system, or locally via a magnet or push button test. The proof test diagnoses the sensor for corrosion and build-up in order to ensure that the instrument is operating properly.

Verification can be activated either manually or automatically with the use of the company’s Heartbeat technology, providing a verification report that can be used as documentation for various regulatory agencies.

Access via Bluetooth technology and a mobile device, such as a smartphone, allows a user to identify each device, commission it, check the status, start a proof test and download verification documentation. The Bluetooth range allows a technician to access instruments installed in hard-to-reach locations, such as at the top of tanks.